b26a3da584
Looks notably shorter this way tests: unit(dev) Signed-off-by: Pavel Emelyanov <xemul@scylladb.com> Message-Id: <20220422093000.24407-1-xemul@scylladb.com>
2601 lines
114 KiB
C++
2601 lines
114 KiB
C++
/*
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*
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* Modified by ScyllaDB
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* Copyright (C) 2015-present ScyllaDB
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*/
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/*
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* SPDX-License-Identifier: (AGPL-3.0-or-later and Apache-2.0)
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*/
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#include "gms/inet_address.hh"
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#include "gms/endpoint_state.hh"
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#include "gms/gossip_digest.hh"
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#include "gms/gossip_digest_syn.hh"
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#include "gms/gossip_digest_ack.hh"
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#include "gms/gossip_digest_ack2.hh"
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#include "gms/versioned_value.hh"
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#include "gms/gossiper.hh"
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#include "gms/feature_service.hh"
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#include "gms/application_state.hh"
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#include "gms/failure_detector.hh"
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#include "gms/i_failure_detection_event_listener.hh"
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#include "gms/i_endpoint_state_change_subscriber.hh"
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#include "message/messaging_service.hh"
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#include "log.hh"
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#include "db/system_keyspace.hh"
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#include <seastar/core/sleep.hh>
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#include <seastar/core/thread.hh>
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#include <seastar/core/metrics.hh>
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#include <seastar/util/defer.hh>
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#include <seastar/core/coroutine.hh>
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#include <chrono>
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#include "db/config.hh"
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#include <boost/range/algorithm/set_algorithm.hpp>
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#include <boost/range/adaptors.hpp>
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#include <boost/range/algorithm/count_if.hpp>
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#include <boost/range/algorithm/partition.hpp>
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#include <boost/algorithm/string/split.hpp>
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#include <boost/algorithm/string/classification.hpp>
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#include "utils/generation-number.hh"
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#include "locator/token_metadata.hh"
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#include "utils/exceptions.hh"
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namespace gms {
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using clk = gossiper::clk;
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static logging::logger logger("gossip");
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constexpr std::chrono::milliseconds gossiper::INTERVAL;
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constexpr std::chrono::hours gossiper::A_VERY_LONG_TIME;
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constexpr int64_t gossiper::MAX_GENERATION_DIFFERENCE;
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netw::msg_addr gossiper::get_msg_addr(inet_address to) const noexcept {
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return msg_addr{to, _default_cpuid};
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}
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const sstring& gossiper::get_cluster_name() const noexcept {
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return _gcfg.cluster_name;
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}
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const std::set<inet_address>& gossiper::get_seeds() const noexcept {
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return _gcfg.seeds;
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}
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std::chrono::milliseconds gossiper::quarantine_delay() const noexcept {
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auto delay = std::max(unsigned(30000), _gcfg.ring_delay_ms);
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auto ring_delay = std::chrono::milliseconds(delay);
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return ring_delay * 2;
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}
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class feature_enabler : public i_endpoint_state_change_subscriber {
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gossiper& _g;
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public:
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feature_enabler(gossiper& g) : _g(g) {}
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future<> on_join(inet_address ep, endpoint_state state) override {
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return _g.maybe_enable_features();
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}
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future<> on_change(inet_address ep, application_state state, const versioned_value&) override {
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if (state == application_state::SUPPORTED_FEATURES) {
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return _g.maybe_enable_features();
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}
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return make_ready_future();
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}
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future<> before_change(inet_address, endpoint_state, application_state, const versioned_value&) override { return make_ready_future(); }
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future<> on_alive(inet_address, endpoint_state) override { return make_ready_future(); }
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future<> on_dead(inet_address, endpoint_state) override { return make_ready_future(); }
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future<> on_remove(inet_address) override { return make_ready_future(); }
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future<> on_restart(inet_address, endpoint_state) override { return make_ready_future(); }
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};
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gossiper::gossiper(abort_source& as, feature_service& features, const locator::shared_token_metadata& stm, netw::messaging_service& ms, sharded<db::system_keyspace>& sys_ks, const db::config& cfg, gossip_config gcfg)
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: _abort_source(as)
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, _feature_service(features)
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, _shared_token_metadata(stm)
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, _messaging(ms)
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, _sys_ks(sys_ks)
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, _failure_detector_timeout_ms(cfg.failure_detector_timeout_in_ms)
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, _force_gossip_generation(cfg.force_gossip_generation)
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, _gcfg(std::move(gcfg)) {
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// Gossiper's stuff below runs only on CPU0
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if (this_shard_id() != 0) {
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return;
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}
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_scheduled_gossip_task.set_callback(_gcfg.gossip_scheduling_group, [this] { run(); });
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// half of QUARATINE_DELAY, to ensure _just_removed_endpoints has enough leeway to prevent re-gossip
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fat_client_timeout = quarantine_delay() / 2;
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register_(make_shared<feature_enabler>(*this));
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// Register this instance with JMX
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namespace sm = seastar::metrics;
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auto ep = get_broadcast_address();
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_metrics.add_group("gossip", {
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sm::make_derive("heart_beat",
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[ep, this] {
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auto es = get_endpoint_state_for_endpoint_ptr(ep);
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if (es) {
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return es->get_heart_beat_state().get_heart_beat_version();
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} else {
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return 0;
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}
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}, sm::description("Heartbeat of the current Node.")),
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sm::make_gauge("live",
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[this] {
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return _live_endpoints.size();
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}, sm::description("How many live nodes the current node sees")),
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sm::make_gauge("unreachable",
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[this] {
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return _unreachable_endpoints.size();
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}, sm::description("How many unreachable nodes the current node sees")),
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});
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}
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/*
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* First construct a map whose key is the endpoint in the GossipDigest and the value is the
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* GossipDigest itself. Then build a list of version differences i.e difference between the
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* version in the GossipDigest and the version in the local state for a given InetAddress.
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* Sort this list. Now loop through the sorted list and retrieve the GossipDigest corresponding
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* to the endpoint from the map that was initially constructed.
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*/
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void gossiper::do_sort(utils::chunked_vector<gossip_digest>& g_digest_list) {
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/* Construct a map of endpoint to GossipDigest. */
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std::map<inet_address, gossip_digest> ep_to_digest_map;
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for (auto g_digest : g_digest_list) {
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ep_to_digest_map.emplace(g_digest.get_endpoint(), g_digest);
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}
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/*
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* These digests have their maxVersion set to the difference of the version
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* of the local EndpointState and the version found in the GossipDigest.
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*/
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utils::chunked_vector<gossip_digest> diff_digests;
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for (auto g_digest : g_digest_list) {
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auto ep = g_digest.get_endpoint();
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auto* ep_state = this->get_endpoint_state_for_endpoint_ptr(ep);
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int version = ep_state ? this->get_max_endpoint_state_version(*ep_state) : 0;
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int diff_version = ::abs(version - g_digest.get_max_version());
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diff_digests.emplace_back(gossip_digest(ep, g_digest.get_generation(), diff_version));
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}
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g_digest_list.clear();
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std::sort(diff_digests.begin(), diff_digests.end());
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int size = diff_digests.size();
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/*
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* Report the digests in descending order. This takes care of the endpoints
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* that are far behind w.r.t this local endpoint
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*/
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for (int i = size - 1; i >= 0; --i) {
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g_digest_list.emplace_back(ep_to_digest_map[diff_digests[i].get_endpoint()]);
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}
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}
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// Depends on
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// - no external dependency
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future<> gossiper::handle_syn_msg(msg_addr from, gossip_digest_syn syn_msg) {
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logger.trace("handle_syn_msg():from={},cluster_name:peer={},local={},partitioner_name:peer={},local={}",
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from, syn_msg.cluster_id(), get_cluster_name(), syn_msg.partioner(), get_partitioner_name());
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if (!this->is_enabled()) {
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return make_ready_future<>();
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}
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/* If the message is from a different cluster throw it away. */
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if (syn_msg.cluster_id() != get_cluster_name()) {
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logger.warn("ClusterName mismatch from {} {}!={}", from.addr, syn_msg.cluster_id(), get_cluster_name());
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return make_ready_future<>();
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}
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if (syn_msg.partioner() != "" && syn_msg.partioner() != get_partitioner_name()) {
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logger.warn("Partitioner mismatch from {} {}!={}", from.addr, syn_msg.partioner(), get_partitioner_name());
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return make_ready_future<>();
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}
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syn_msg_pending& p = _syn_handlers[from.addr];
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if (p.pending) {
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// The latest syn message from peer has the latest infomation, so
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// it is safe to drop the previous syn message and keep the latest
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// one only.
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logger.debug("Queue gossip syn msg from node {}, syn_msg={}", from, syn_msg);
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p.syn_msg = std::move(syn_msg);
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return make_ready_future<>();
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} else {
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// Process the syn message immediately
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logger.debug("Process gossip syn msg from node {}, syn_msg={}", from, syn_msg);
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p.pending = true;
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return do_with(std::move(syn_msg), [this, from, g = this->shared_from_this()] (gossip_digest_syn& syn_msg) mutable {
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return repeat([this, from, g, &syn_msg] {
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return do_send_ack_msg(from, std::move(syn_msg)).then([this, from, &syn_msg] () mutable {
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if (!_syn_handlers.contains(from.addr)) {
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return stop_iteration::yes;
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}
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syn_msg_pending& p = _syn_handlers[from.addr];
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if (p.syn_msg) {
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// Process pending gossip syn msg and send ack msg back
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logger.debug("Handle queued gossip syn msg from node {}, syn_msg={}, pending={}",
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from, p.syn_msg, p.pending);
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syn_msg = std::move(p.syn_msg.value());
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p.syn_msg = {};
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return stop_iteration::no;
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} else {
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// No more pending syn msg to process
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p.pending = false;
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logger.debug("No more queued gossip syn msg from node {}, syn_msg={}, pending={}",
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from, p.syn_msg, p.pending);
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return stop_iteration::yes;
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}
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}).handle_exception([this, from] (std::exception_ptr ep) {
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if (_syn_handlers.contains(from.addr)) {
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syn_msg_pending& p = _syn_handlers[from.addr];
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p.pending = false;
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p.syn_msg = {};
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}
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logger.warn("Failed to process gossip syn msg from node {}: {}", from, ep);
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return make_exception_future<stop_iteration>(ep);
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});
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});
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});
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}
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}
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future<> gossiper::do_send_ack_msg(msg_addr from, gossip_digest_syn syn_msg) {
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return futurize_invoke([this, from, syn_msg = std::move(syn_msg)] () mutable {
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auto g_digest_list = syn_msg.get_gossip_digests();
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do_sort(g_digest_list);
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utils::chunked_vector<gossip_digest> delta_gossip_digest_list;
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std::map<inet_address, endpoint_state> delta_ep_state_map;
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this->examine_gossiper(g_digest_list, delta_gossip_digest_list, delta_ep_state_map);
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gms::gossip_digest_ack ack_msg(std::move(delta_gossip_digest_list), std::move(delta_ep_state_map));
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logger.debug("Calling do_send_ack_msg to node {}, syn_msg={}, ack_msg={}", from, syn_msg, ack_msg);
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return _messaging.send_gossip_digest_ack(from, std::move(ack_msg));
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});
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}
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class gossiper::msg_proc_guard {
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public:
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msg_proc_guard(gossiper& g)
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: _ptr(&(++g._msg_processing), [](uint64_t * p) { if (p) { --(*p); } })
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{}
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msg_proc_guard(msg_proc_guard&& m) = default;
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private:
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std::unique_ptr<uint64_t, void(*)(uint64_t*)> _ptr;
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};
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// Depends on
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// - failure_detector
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// - on_change callbacks, e.g., storage_service -> access db system_table
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// - on_restart callbacks
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// - on_join callbacks
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// - on_alive
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future<> gossiper::handle_ack_msg(msg_addr id, gossip_digest_ack ack_msg) {
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logger.trace("handle_ack_msg():from={},msg={}", id, ack_msg);
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if (!this->is_enabled() && !this->is_in_shadow_round()) {
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return make_ready_future<>();
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}
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msg_proc_guard mp(*this);
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auto g_digest_list = ack_msg.get_gossip_digest_list();
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auto& ep_state_map = ack_msg.get_endpoint_state_map();
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auto f = make_ready_future<>();
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if (ep_state_map.size() > 0) {
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update_timestamp_for_nodes(ep_state_map);
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f = this->apply_state_locally(std::move(ep_state_map));
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}
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assert(_msg_processing > 0);
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return f.then([this, from = id, ack_msg_digest = std::move(g_digest_list), mp = std::move(mp), g = this->shared_from_this()] () mutable {
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if (this->is_in_shadow_round()) {
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this->finish_shadow_round();
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// don't bother doing anything else, we have what we came for
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return make_ready_future<>();
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}
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ack_msg_pending& p = _ack_handlers[from.addr];
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if (p.pending) {
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// The latest ack message digests from peer has the latest infomation, so
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// it is safe to drop the previous ack message digests and keep the latest
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// one only.
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logger.debug("Queue gossip ack msg digests from node {}, ack_msg_digest={}", from, ack_msg_digest);
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p.ack_msg_digest = std::move(ack_msg_digest);
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return make_ready_future<>();
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} else {
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// Process the ack message immediately
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logger.debug("Process gossip ack msg digests from node {}, ack_msg_digest={}", from, ack_msg_digest);
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p.pending = true;
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return do_with(std::move(ack_msg_digest), [this, from, g] (utils::chunked_vector<gossip_digest>& ack_msg_digest) mutable {
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return repeat([this, from, g, &ack_msg_digest] {
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return do_send_ack2_msg(from, std::move(ack_msg_digest)).then([this, from, &ack_msg_digest] () mutable {
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if (!_ack_handlers.contains(from.addr)) {
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return stop_iteration::yes;
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}
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ack_msg_pending& p = _ack_handlers[from.addr];
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if (p.ack_msg_digest) {
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// Process pending gossip ack msg digests and send ack2 msg back
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logger.debug("Handle queued gossip ack msg digests from node {}, ack_msg_digest={}, pending={}",
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from, p.ack_msg_digest, p.pending);
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ack_msg_digest = std::move(p.ack_msg_digest.value());
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p.ack_msg_digest= {};
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return stop_iteration::no;
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} else {
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// No more pending ack msg digests to process
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p.pending = false;
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logger.debug("No more queued gossip ack msg digests from node {}, ack_msg_digest={}, pending={}",
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from, p.ack_msg_digest, p.pending);
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return stop_iteration::yes;
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}
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}).handle_exception([this, from] (std::exception_ptr ep) {
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if (_ack_handlers.contains(from.addr)) {
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ack_msg_pending& p = _ack_handlers[from.addr];
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p.pending = false;
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p.ack_msg_digest = {};
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logger.warn("Failed to process gossip ack msg digests from node {}: {}", from, ep);
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}
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return make_exception_future<stop_iteration>(ep);
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});
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});
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});
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}
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});
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}
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future<> gossiper::do_send_ack2_msg(msg_addr from, utils::chunked_vector<gossip_digest> ack_msg_digest) {
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return futurize_invoke([this, from, ack_msg_digest = std::move(ack_msg_digest)] () mutable {
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/* Get the state required to send to this gossipee - construct GossipDigestAck2Message */
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std::map<inet_address, endpoint_state> delta_ep_state_map;
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for (auto g_digest : ack_msg_digest) {
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inet_address addr = g_digest.get_endpoint();
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auto local_ep_state_ptr = this->get_state_for_version_bigger_than(addr, g_digest.get_max_version());
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if (local_ep_state_ptr) {
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delta_ep_state_map.emplace(addr, *local_ep_state_ptr);
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}
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}
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gms::gossip_digest_ack2 ack2_msg(std::move(delta_ep_state_map));
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logger.debug("Calling do_send_ack2_msg to node {}, ack_msg_digest={}, ack2_msg={}", from, ack_msg_digest, ack2_msg);
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return _messaging.send_gossip_digest_ack2(from, std::move(ack2_msg));
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});
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}
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// Depends on
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// - failure_detector
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// - on_change callbacks, e.g., storage_service -> access db system_table
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// - on_restart callbacks
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// - on_join callbacks
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// - on_alive callbacks
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future<> gossiper::handle_ack2_msg(msg_addr from, gossip_digest_ack2 msg) {
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logger.trace("handle_ack2_msg():msg={}", msg);
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if (!is_enabled()) {
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return make_ready_future<>();
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}
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msg_proc_guard mp(*this);
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auto& remote_ep_state_map = msg.get_endpoint_state_map();
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update_timestamp_for_nodes(remote_ep_state_map);
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return apply_state_locally(std::move(remote_ep_state_map)).finally([mp = std::move(mp)] {});
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}
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future<> gossiper::handle_echo_msg(gms::inet_address from, std::optional<int64_t> generation_number_opt) {
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bool respond = true;
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if (!_advertise_myself) {
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respond = false;
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} else {
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if (!_advertise_to_nodes.empty()) {
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auto it = _advertise_to_nodes.find(from);
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if (it == _advertise_to_nodes.end()) {
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respond = false;
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} else {
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auto es = get_endpoint_state_for_endpoint_ptr(from);
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if (es) {
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int64_t saved_generation_number = it->second;
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int64_t current_generation_number = generation_number_opt ?
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generation_number_opt.value() : es->get_heart_beat_state().get_generation();
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respond = saved_generation_number == current_generation_number;
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logger.debug("handle_echo_msg: from={}, saved_generation_number={}, current_generation_number={}",
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from, saved_generation_number, current_generation_number);
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} else {
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respond = false;
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}
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}
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}
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}
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if (!respond) {
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return make_exception_future(std::runtime_error("Not ready to respond gossip echo message"));
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}
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return make_ready_future<>();
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}
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future<> gossiper::handle_shutdown_msg(inet_address from, std::optional<int64_t> generation_number_opt) {
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if (!is_enabled()) {
|
|
logger.debug("Ignoring shutdown message from {} because gossip is disabled", from);
|
|
co_return;
|
|
}
|
|
|
|
auto permit = co_await this->lock_endpoint(from);
|
|
if (generation_number_opt) {
|
|
auto es = this->get_endpoint_state_for_endpoint_ptr(from);
|
|
if (es) {
|
|
int local_generation = es->get_heart_beat_state().get_generation();
|
|
logger.info("Got shutdown message from {}, received_generation={}, local_generation={}",
|
|
from, generation_number_opt.value(), local_generation);
|
|
if (local_generation != generation_number_opt.value()) {
|
|
logger.warn("Ignoring shutdown message from {} because generation number does not match, received_generation={}, local_generation={}",
|
|
from, generation_number_opt.value(), local_generation);
|
|
co_return;
|
|
}
|
|
} else {
|
|
logger.warn("Ignoring shutdown message from {} because generation number does not match, received_generation={}, local_generation=not found",
|
|
from, generation_number_opt.value());
|
|
co_return;
|
|
}
|
|
}
|
|
co_await this->mark_as_shutdown(from);
|
|
}
|
|
|
|
future<gossip_get_endpoint_states_response>
|
|
gossiper::handle_get_endpoint_states_msg(gossip_get_endpoint_states_request request) {
|
|
std::unordered_map<gms::inet_address, gms::endpoint_state> map;
|
|
const auto& application_states_wanted = request.application_states;
|
|
for (auto& item : endpoint_state_map) {
|
|
const inet_address& node = item.first;
|
|
const endpoint_state& state = item.second;
|
|
const heart_beat_state& hbs = state.get_heart_beat_state();
|
|
auto state_wanted = endpoint_state(hbs);
|
|
const std::map<application_state, versioned_value>& apps = state.get_application_state_map();
|
|
for (const auto& app : apps) {
|
|
if (application_states_wanted.count(app.first) > 0) {
|
|
state_wanted.get_application_state_map().emplace(app);
|
|
}
|
|
}
|
|
map.emplace(node, std::move(state_wanted));
|
|
}
|
|
return make_ready_future<gossip_get_endpoint_states_response>(gossip_get_endpoint_states_response{std::move(map)});
|
|
}
|
|
|
|
rpc::no_wait_type gossiper::background_msg(sstring type, noncopyable_function<future<>(gossiper&)> fn) {
|
|
(void)with_gate(_background_msg, [this, type = std::move(type), fn = std::move(fn)] () mutable {
|
|
return container().invoke_on(0, std::move(fn)).handle_exception([type = std::move(type)] (auto ep) {
|
|
logger.warn("Failed to handle {}: {}", type, ep);
|
|
});
|
|
});
|
|
return messaging_service::no_wait();
|
|
}
|
|
|
|
void gossiper::init_messaging_service_handler() {
|
|
_messaging.register_gossip_digest_syn([this] (const rpc::client_info& cinfo, gossip_digest_syn syn_msg) {
|
|
auto from = netw::messaging_service::get_source(cinfo);
|
|
return background_msg("GOSSIP_DIGEST_SYN", [from, syn_msg = std::move(syn_msg)] (gms::gossiper& gossiper) mutable {
|
|
return gossiper.handle_syn_msg(from, std::move(syn_msg));
|
|
});
|
|
});
|
|
_messaging.register_gossip_digest_ack([this] (const rpc::client_info& cinfo, gossip_digest_ack msg) {
|
|
auto from = netw::messaging_service::get_source(cinfo);
|
|
return background_msg("GOSSIP_DIGEST_ACK", [from, msg = std::move(msg)] (gms::gossiper& gossiper) mutable {
|
|
return gossiper.handle_ack_msg(from, std::move(msg));
|
|
});
|
|
});
|
|
_messaging.register_gossip_digest_ack2([this] (const rpc::client_info& cinfo, gossip_digest_ack2 msg) {
|
|
auto from = netw::messaging_service::get_source(cinfo);
|
|
return background_msg("GOSSIP_DIGEST_ACK2", [from, msg = std::move(msg)] (gms::gossiper& gossiper) mutable {
|
|
return gossiper.handle_ack2_msg(from, std::move(msg));
|
|
});
|
|
});
|
|
_messaging.register_gossip_echo([this] (const rpc::client_info& cinfo, rpc::optional<int64_t> generation_number_opt) {
|
|
auto from = cinfo.retrieve_auxiliary<gms::inet_address>("baddr");
|
|
return handle_echo_msg(from, generation_number_opt);
|
|
});
|
|
_messaging.register_gossip_shutdown([this] (inet_address from, rpc::optional<int64_t> generation_number_opt) {
|
|
return background_msg("GOSSIP_SHUTDOWN", [from, generation_number_opt] (gms::gossiper& gossiper) {
|
|
return gossiper.handle_shutdown_msg(from, generation_number_opt);
|
|
});
|
|
});
|
|
_messaging.register_gossip_get_endpoint_states([this] (const rpc::client_info& cinfo, gossip_get_endpoint_states_request request) {
|
|
return container().invoke_on(0, [request = std::move(request)] (gms::gossiper& gossiper) mutable {
|
|
return gossiper.handle_get_endpoint_states_msg(std::move(request));
|
|
});
|
|
});
|
|
}
|
|
|
|
future<> gossiper::uninit_messaging_service_handler() {
|
|
auto& ms = _messaging;
|
|
return when_all_succeed(
|
|
ms.unregister_gossip_echo(),
|
|
ms.unregister_gossip_shutdown(),
|
|
ms.unregister_gossip_digest_syn(),
|
|
ms.unregister_gossip_digest_ack(),
|
|
ms.unregister_gossip_digest_ack2(),
|
|
ms.unregister_gossip_get_endpoint_states()
|
|
).discard_result();
|
|
}
|
|
|
|
future<> gossiper::send_gossip(gossip_digest_syn message, std::set<inet_address> epset) {
|
|
utils::chunked_vector<inet_address> __live_endpoints(epset.begin(), epset.end());
|
|
size_t size = __live_endpoints.size();
|
|
if (size < 1) {
|
|
return make_ready_future<>();
|
|
}
|
|
/* Generate a random number from 0 -> size */
|
|
std::uniform_int_distribution<int> dist(0, size - 1);
|
|
int index = dist(_random_engine);
|
|
inet_address to = __live_endpoints[index];
|
|
auto id = get_msg_addr(to);
|
|
logger.trace("Sending a GossipDigestSyn to {} ...", id);
|
|
return _messaging.send_gossip_digest_syn(id, std::move(message)).handle_exception([id] (auto ep) {
|
|
// It is normal to reach here because it is normal that a node
|
|
// tries to send a SYN message to a peer node which is down before
|
|
// failure_detector thinks that peer node is down.
|
|
logger.trace("Fail to send GossipDigestSyn to {}: {}", id, ep);
|
|
});
|
|
}
|
|
|
|
|
|
future<> gossiper::do_apply_state_locally(gms::inet_address node, const endpoint_state& remote_state, bool listener_notification) {
|
|
// If state does not exist just add it. If it does then add it if the remote generation is greater.
|
|
// If there is a generation tie, attempt to break it by heartbeat version.
|
|
auto permit = co_await this->lock_endpoint(node);
|
|
auto es = this->get_endpoint_state_for_endpoint_ptr(node);
|
|
if (es) {
|
|
endpoint_state& local_state = *es;
|
|
int local_generation = local_state.get_heart_beat_state().get_generation();
|
|
int remote_generation = remote_state.get_heart_beat_state().get_generation();
|
|
logger.trace("{} local generation {}, remote generation {}", node, local_generation, remote_generation);
|
|
if (remote_generation > utils::get_generation_number() + MAX_GENERATION_DIFFERENCE) {
|
|
// assume some peer has corrupted memory and is broadcasting an unbelievable generation about another peer (or itself)
|
|
logger.warn("received an invalid gossip generation for peer {}; local generation = {}, received generation = {}",
|
|
node, local_generation, remote_generation);
|
|
} else if (remote_generation > local_generation) {
|
|
if (listener_notification) {
|
|
logger.trace("Updating heartbeat state generation to {} from {} for {}", remote_generation, local_generation, node);
|
|
// major state change will handle the update by inserting the remote state directly
|
|
co_await this->handle_major_state_change(node, remote_state);
|
|
} else {
|
|
logger.debug("Applying remote_state for node {} (remote generation > local generation)", node);
|
|
endpoint_state_map[node] = remote_state;
|
|
}
|
|
} else if (remote_generation == local_generation) {
|
|
if (listener_notification) {
|
|
// find maximum state
|
|
int local_max_version = this->get_max_endpoint_state_version(local_state);
|
|
int remote_max_version = this->get_max_endpoint_state_version(remote_state);
|
|
if (remote_max_version > local_max_version) {
|
|
// apply states, but do not notify since there is no major change
|
|
co_await this->apply_new_states(node, local_state, remote_state);
|
|
} else {
|
|
logger.trace("Ignoring remote version {} <= {} for {}", remote_max_version, local_max_version, node);
|
|
}
|
|
if (!local_state.is_alive() && !this->is_dead_state(local_state)) { // unless of course, it was dead
|
|
this->mark_alive(node, local_state);
|
|
}
|
|
} else {
|
|
for (const auto& item : remote_state.get_application_state_map()) {
|
|
const auto& remote_key = item.first;
|
|
const auto& remote_value = item.second;
|
|
const versioned_value* local_value = local_state.get_application_state_ptr(remote_key);
|
|
if (!local_value || remote_value.version > local_value->version) {
|
|
logger.debug("Applying remote_state for node {} (remote generation = local generation), key={}, value={}",
|
|
node, remote_key, remote_value);
|
|
local_state.add_application_state(remote_key, remote_value);
|
|
} else {
|
|
logger.debug("Ignoring remote_state for node {} (remote generation = local generation), key={}, value={}", node, remote_key, remote_value);
|
|
}
|
|
}
|
|
}
|
|
} else {
|
|
logger.debug("Ignoring remote generation {} < {}", remote_generation, local_generation);
|
|
}
|
|
} else {
|
|
if (listener_notification) {
|
|
co_await this->handle_major_state_change(node, remote_state);
|
|
} else {
|
|
logger.debug("Applying remote_state for node {} (new node)", node);
|
|
endpoint_state_map[node] = remote_state;
|
|
}
|
|
}
|
|
}
|
|
|
|
future<> gossiper::apply_state_locally_without_listener_notification(std::unordered_map<inet_address, endpoint_state> map) {
|
|
for (auto& x : map) {
|
|
const inet_address& node = x.first;
|
|
const endpoint_state& remote_state = x.second;
|
|
co_await do_apply_state_locally(node, remote_state, false);
|
|
}
|
|
}
|
|
|
|
future<> gossiper::apply_state_locally(std::map<inet_address, endpoint_state> map) {
|
|
auto start = std::chrono::steady_clock::now();
|
|
auto endpoints = boost::copy_range<utils::chunked_vector<inet_address>>(map | boost::adaptors::map_keys);
|
|
std::shuffle(endpoints.begin(), endpoints.end(), _random_engine);
|
|
auto node_is_seed = [this] (gms::inet_address ip) { return is_seed(ip); };
|
|
boost::partition(endpoints, node_is_seed);
|
|
logger.debug("apply_state_locally_endpoints={}", endpoints);
|
|
|
|
co_await parallel_for_each(endpoints, [this, &map] (auto&& ep) -> future<> {
|
|
if (ep == this->get_broadcast_address() && !this->is_in_shadow_round()) {
|
|
return make_ready_future<>();
|
|
}
|
|
if (_just_removed_endpoints.contains(ep)) {
|
|
logger.trace("Ignoring gossip for {} because it is quarantined", ep);
|
|
return make_ready_future<>();
|
|
}
|
|
return seastar::with_semaphore(_apply_state_locally_semaphore, 1, [this, &ep, &map] () mutable {
|
|
return do_apply_state_locally(ep, map[ep], true);
|
|
});
|
|
});
|
|
|
|
logger.debug("apply_state_locally() took {} ms", std::chrono::duration_cast<std::chrono::milliseconds>(
|
|
std::chrono::steady_clock::now() - start).count());
|
|
}
|
|
|
|
future<> gossiper::force_remove_endpoint(inet_address endpoint) {
|
|
if (endpoint == get_broadcast_address()) {
|
|
return make_exception_future<>(std::runtime_error(format("Can not force remove node {} itself", endpoint)));
|
|
}
|
|
return container().invoke_on(0, [endpoint] (auto& gossiper) mutable -> future<> {
|
|
try {
|
|
co_await gossiper.remove_endpoint(endpoint);
|
|
co_await gossiper.evict_from_membership(endpoint);
|
|
logger.info("Finished to force remove node {}", endpoint);
|
|
} catch (...) {
|
|
logger.warn("Failed to force remove node {}: {}", endpoint, std::current_exception());
|
|
}
|
|
});
|
|
}
|
|
|
|
future<> gossiper::remove_endpoint(inet_address endpoint) {
|
|
// do subscribers first so anything in the subscriber that depends on gossiper state won't get confused
|
|
// We can not run on_remove callbacks here becasue on_remove in
|
|
// storage_service might take the gossiper::timer_callback_lock
|
|
(void)seastar::async([this, endpoint] {
|
|
_subscribers.for_each([endpoint] (shared_ptr<i_endpoint_state_change_subscriber> subscriber) {
|
|
return subscriber->on_remove(endpoint);
|
|
}).get();
|
|
}).handle_exception([] (auto ep) {
|
|
logger.warn("Fail to call on_remove callback: {}", ep);
|
|
});
|
|
|
|
if(_seeds.contains(endpoint)) {
|
|
build_seeds_list();
|
|
_seeds.erase(endpoint);
|
|
logger.info("removed {} from _seeds, updated _seeds list = {}", endpoint, _seeds);
|
|
}
|
|
|
|
_live_endpoints.resize(std::distance(_live_endpoints.begin(), std::remove(_live_endpoints.begin(), _live_endpoints.end(), endpoint)));
|
|
co_await update_live_endpoints_version();
|
|
_unreachable_endpoints.erase(endpoint);
|
|
_syn_handlers.erase(endpoint);
|
|
_ack_handlers.erase(endpoint);
|
|
quarantine_endpoint(endpoint);
|
|
logger.debug("removing endpoint {}", endpoint);
|
|
}
|
|
|
|
future<> gossiper::do_status_check() {
|
|
logger.trace("Performing status check ...");
|
|
|
|
auto now = this->now();
|
|
|
|
for (auto it = endpoint_state_map.begin(); it != endpoint_state_map.end();) {
|
|
auto endpoint = it->first;
|
|
auto& ep_state = it->second;
|
|
it++;
|
|
|
|
bool is_alive = ep_state.is_alive();
|
|
if (endpoint == get_broadcast_address()) {
|
|
continue;
|
|
}
|
|
|
|
// check if this is a fat client. fat clients are removed automatically from
|
|
// gossip after FatClientTimeout. Do not remove dead states here.
|
|
if (is_gossip_only_member(endpoint)
|
|
&& !_just_removed_endpoints.contains(endpoint)
|
|
&& ((now - ep_state.get_update_timestamp()) > fat_client_timeout)) {
|
|
logger.info("FatClient {} has been silent for {}ms, removing from gossip", endpoint, fat_client_timeout.count());
|
|
co_await remove_endpoint(endpoint); // will put it in _just_removed_endpoints to respect quarantine delay
|
|
co_await evict_from_membership(endpoint); // can get rid of the state immediately
|
|
}
|
|
|
|
// check for dead state removal
|
|
auto expire_time = get_expire_time_for_endpoint(endpoint);
|
|
if (!is_alive && (now > expire_time)
|
|
&& (!get_token_metadata_ptr()->is_member(endpoint))) {
|
|
logger.debug("time is expiring for endpoint : {} ({})", endpoint, expire_time.time_since_epoch().count());
|
|
co_await evict_from_membership(endpoint);
|
|
}
|
|
}
|
|
|
|
for (auto it = _just_removed_endpoints.begin(); it != _just_removed_endpoints.end();) {
|
|
auto& t= it->second;
|
|
if ((now - t) > quarantine_delay()) {
|
|
logger.info("{} ms elapsed, {} gossip quarantine over", quarantine_delay().count(), it->first);
|
|
it = _just_removed_endpoints.erase(it);
|
|
} else {
|
|
it++;
|
|
}
|
|
}
|
|
}
|
|
|
|
future<gossiper::endpoint_permit> gossiper::lock_endpoint(inet_address ep) {
|
|
return endpoint_locks.get_or_load(ep, [] (const inet_address& ep) { return semaphore(1); }).then([] (auto eptr) {
|
|
return get_units(*eptr, 1).then([eptr] (auto units) mutable {
|
|
return endpoint_permit{std::move(eptr), std::move(units)};
|
|
});
|
|
});
|
|
}
|
|
|
|
future<> gossiper::update_live_endpoints_version() {
|
|
auto version = _live_endpoints_version + 1;
|
|
return container().invoke_on_all([version] (gms::gossiper& g) {
|
|
g._live_endpoints_version = version;
|
|
});
|
|
}
|
|
|
|
future<> gossiper::failure_detector_loop_for_node(gms::inet_address node, int64_t gossip_generation, uint64_t live_endpoints_version) {
|
|
auto last = gossiper::clk::now();
|
|
auto diff = gossiper::clk::duration(0);
|
|
auto echo_interval = std::chrono::milliseconds(2000);
|
|
auto max_duration = echo_interval + std::chrono::milliseconds(_failure_detector_timeout_ms());
|
|
while (is_enabled()) {
|
|
bool failed = false;
|
|
try {
|
|
logger.debug("failure_detector_loop: Send echo to node {}, status = started", node);
|
|
co_await _messaging.send_gossip_echo(netw::msg_addr(node), gossip_generation, max_duration);
|
|
logger.debug("failure_detector_loop: Send echo to node {}, status = ok", node);
|
|
} catch (...) {
|
|
failed = true;
|
|
logger.warn("failure_detector_loop: Send echo to node {}, status = failed: {}", node, std::current_exception());
|
|
}
|
|
auto now = gossiper::clk::now();
|
|
diff = now - last;
|
|
if (!failed) {
|
|
last = now;
|
|
}
|
|
if (diff > max_duration) {
|
|
logger.info("failure_detector_loop: Mark node {} as DOWN", node);
|
|
co_await container().invoke_on(0, [node] (gms::gossiper& g) {
|
|
return g.convict(node);
|
|
});
|
|
co_return;
|
|
}
|
|
|
|
// When live_endpoints changes, live_endpoints_version changes. When
|
|
// live_endpoints changes, it is the time to re-distribute live nodes
|
|
// to different shards. We return from the per node loop here. The
|
|
// failure_detector_loop main loop will restart the per node loop.
|
|
if (_live_endpoints_version != live_endpoints_version) {
|
|
logger.debug("failure_detector_loop: Finished loop for node {}, live_endpoints={}, current_live_endpoints_version={}, live_endpoints_version={}",
|
|
node, _live_endpoints, _live_endpoints_version, live_endpoints_version);
|
|
co_return;
|
|
} else {
|
|
co_await sleep_abortable(echo_interval, _abort_source);
|
|
}
|
|
}
|
|
co_return;
|
|
}
|
|
|
|
future<> gossiper::failure_detector_loop() {
|
|
auto shard = this_shard_id();
|
|
if (shard != 0) {
|
|
co_return;
|
|
}
|
|
logger.info("failure_detector_loop: Started main loop");
|
|
while (is_enabled() && !_abort_source.abort_requested()) {
|
|
try {
|
|
while (_live_endpoints.empty() && is_enabled()) {
|
|
logger.debug("failure_detector_loop: Wait until live_nodes={} is not empty", _live_endpoints);
|
|
co_await sleep_abortable(std::chrono::milliseconds(1000), _abort_source);
|
|
}
|
|
if (!is_enabled()) {
|
|
co_return;
|
|
}
|
|
auto nodes = _live_endpoints;
|
|
auto live_endpoints_version = _live_endpoints_version;
|
|
auto generation_number = endpoint_state_map[get_broadcast_address()].get_heart_beat_state().get_generation();
|
|
co_await parallel_for_each(boost::irange(size_t(0), nodes.size()), [this, generation_number, live_endpoints_version, &nodes] (size_t idx) {
|
|
const auto& node = nodes[idx];
|
|
auto shard = idx % smp::count;
|
|
logger.debug("failure_detector_loop: Started new round for node={} on shard={}, live_nodes={}, live_endpoints_version={}",
|
|
node, shard, nodes, live_endpoints_version);
|
|
return container().invoke_on(shard, [node, generation_number, live_endpoints_version] (gms::gossiper& g) {
|
|
return g.failure_detector_loop_for_node(node, generation_number, live_endpoints_version);
|
|
});
|
|
});
|
|
for (;;) {
|
|
auto version = _live_endpoints_version;
|
|
utils::chunked_vector<inet_address> nodes_down;
|
|
std::sort(nodes.begin(), nodes.end());
|
|
std::sort(_live_endpoints.begin(), _live_endpoints.end());
|
|
std::set_difference(nodes.begin(), nodes.end(), _live_endpoints.begin(), _live_endpoints.end(), std::back_inserter(nodes_down));
|
|
if (!nodes_down.empty()) {
|
|
logger.debug("failure_detector_loop: previous_live_nodes={}, current_live_nodes={}, nodes_down={}",
|
|
nodes, _live_endpoints, nodes_down);
|
|
for (const auto& node : nodes_down) {
|
|
co_await convict(node);
|
|
}
|
|
}
|
|
// Make sure _live_endpoints do not change when nodes_down are being convicted above. This guarantees no down nodes will miss the convict.
|
|
logger.debug("failure_detector_loop: previous_live_nodes={}, current_live_nodes={}, nodes_down={}, version_before={}, version_after={}",
|
|
nodes, _live_endpoints, nodes_down, version, _live_endpoints_version);
|
|
if (version == _live_endpoints_version) {
|
|
break;
|
|
}
|
|
}
|
|
} catch (...) {
|
|
logger.warn("failure_detector_loop: Got error in the loop, live_nodes={}: {}",
|
|
_live_endpoints, std::current_exception());
|
|
}
|
|
}
|
|
logger.info("failure_detector_loop: Finished main loop");
|
|
}
|
|
|
|
// Depends on:
|
|
// - failure_detector
|
|
// - on_remove callbacks, e.g, storage_service -> access token_metadata
|
|
void gossiper::run() {
|
|
// Run it in the background.
|
|
(void)seastar::with_semaphore(_callback_running, 1, [this] {
|
|
return seastar::async([this, g = this->shared_from_this()] {
|
|
logger.trace("=== Gossip round START");
|
|
|
|
//wait on messaging service to start listening
|
|
// MessagingService.instance().waitUntilListening();
|
|
|
|
/* Update the local heartbeat counter. */
|
|
auto br_addr = get_broadcast_address();
|
|
heart_beat_state& hbs = endpoint_state_map[br_addr].get_heart_beat_state();
|
|
hbs.update_heart_beat();
|
|
|
|
logger.trace("My heartbeat is now {}", endpoint_state_map[br_addr].get_heart_beat_state().get_heart_beat_version());
|
|
utils::chunked_vector<gossip_digest> g_digests;
|
|
this->make_random_gossip_digest(g_digests);
|
|
|
|
if (g_digests.size() > 0) {
|
|
gossip_digest_syn message(get_cluster_name(), get_partitioner_name(), g_digests);
|
|
|
|
if (_endpoints_to_talk_with.empty()) {
|
|
std::shuffle(_live_endpoints.begin(), _live_endpoints.end(), _random_engine);
|
|
// This guarantees the local node will talk with all nodes
|
|
// in live_endpoints at least once within nr_rounds gossip rounds.
|
|
// Other gossip implementation like SWIM uses similar approach.
|
|
// https://www.cs.cornell.edu/projects/Quicksilver/public_pdfs/SWIM.pdf
|
|
size_t nr_rounds = 10;
|
|
size_t nodes_per_round = (_live_endpoints.size() + nr_rounds - 1) / nr_rounds;
|
|
std::vector<inet_address> live_nodes;
|
|
for (const auto& node : _live_endpoints) {
|
|
if (live_nodes.size() < nodes_per_round) {
|
|
live_nodes.push_back(node);
|
|
} else {
|
|
_endpoints_to_talk_with.push_back(std::move(live_nodes));
|
|
live_nodes = {node};
|
|
}
|
|
}
|
|
if (!live_nodes.empty()) {
|
|
_endpoints_to_talk_with.push_back(live_nodes);
|
|
}
|
|
logger.debug("Set live nodes to talk: endpoint_state_map={}, all_live_nodes={}, endpoints_to_talk_with={}",
|
|
endpoint_state_map.size(), _live_endpoints, _endpoints_to_talk_with);
|
|
}
|
|
if (_endpoints_to_talk_with.empty()) {
|
|
auto nodes = std::vector<inet_address>(_seeds.begin(), _seeds.end());
|
|
logger.debug("No live nodes yet: try initial contact point nodes={}", nodes);
|
|
if (!nodes.empty()) {
|
|
_endpoints_to_talk_with.push_back(std::move(nodes));
|
|
}
|
|
}
|
|
if (!_endpoints_to_talk_with.empty()) {
|
|
auto live_nodes = _endpoints_to_talk_with.front();
|
|
_endpoints_to_talk_with.pop_front();
|
|
logger.debug("Talk to live nodes: {}", live_nodes);
|
|
for (auto& ep: live_nodes) {
|
|
// Do it in the background.
|
|
(void)do_gossip_to_live_member(message, ep).handle_exception([] (auto ep) {
|
|
logger.trace("Failed to do_gossip_to_live_member: {}", ep);
|
|
});
|
|
}
|
|
} else {
|
|
logger.debug("No one to talk with");
|
|
}
|
|
|
|
/* Gossip to some unreachable member with some probability to check if he is back up */
|
|
// Do it in the background.
|
|
(void)do_gossip_to_unreachable_member(message).handle_exception([] (auto ep) {
|
|
logger.trace("Faill to do_gossip_to_unreachable_member: {}", ep);
|
|
});
|
|
|
|
do_status_check().get();
|
|
}
|
|
|
|
//
|
|
// Gossiper task runs only on CPU0:
|
|
//
|
|
// - If endpoint_state_map or _live_endpoints have changed - duplicate
|
|
// them across all other shards.
|
|
// - Reschedule the gossiper only after execution on all nodes is done.
|
|
//
|
|
bool live_endpoint_changed = (_live_endpoints != _shadow_live_endpoints);
|
|
bool unreachable_endpoint_changed = (_unreachable_endpoints != _shadow_unreachable_endpoints);
|
|
|
|
if (live_endpoint_changed || unreachable_endpoint_changed) {
|
|
if (live_endpoint_changed) {
|
|
_shadow_live_endpoints = _live_endpoints;
|
|
}
|
|
|
|
if (unreachable_endpoint_changed) {
|
|
_shadow_unreachable_endpoints = _unreachable_endpoints;
|
|
}
|
|
|
|
container().invoke_on_all([this, live_endpoint_changed, unreachable_endpoint_changed, es = endpoint_state_map] (gossiper& local_gossiper) {
|
|
// Don't copy gossiper(CPU0) maps into themselves!
|
|
if (this_shard_id() != 0) {
|
|
if (live_endpoint_changed) {
|
|
local_gossiper._live_endpoints = _shadow_live_endpoints;
|
|
}
|
|
|
|
if (unreachable_endpoint_changed) {
|
|
local_gossiper._unreachable_endpoints = _shadow_unreachable_endpoints;
|
|
}
|
|
|
|
for (auto&& e : es) {
|
|
local_gossiper.endpoint_state_map[e.first].set_alive(e.second.is_alive());
|
|
}
|
|
}
|
|
}).get();
|
|
}
|
|
}).then_wrapped([this] (auto&& f) {
|
|
try {
|
|
f.get();
|
|
_nr_run++;
|
|
logger.trace("=== Gossip round OK");
|
|
} catch (...) {
|
|
logger.warn("=== Gossip round FAIL: {}", std::current_exception());
|
|
}
|
|
|
|
if (logger.is_enabled(logging::log_level::trace)) {
|
|
for (auto& x : endpoint_state_map) {
|
|
logger.trace("ep={}, eps={}", x.first, x.second);
|
|
}
|
|
}
|
|
if (is_enabled()) {
|
|
_scheduled_gossip_task.arm(INTERVAL);
|
|
} else {
|
|
logger.info("Gossip loop is not scheduled because it is disabled");
|
|
}
|
|
});
|
|
});
|
|
}
|
|
|
|
void gossiper::check_seen_seeds() {
|
|
auto seen = std::any_of(endpoint_state_map.begin(), endpoint_state_map.end(), [this] (auto& entry) {
|
|
if (_seeds.contains(entry.first)) {
|
|
return true;
|
|
}
|
|
auto* internal_ip = entry.second.get_application_state_ptr(application_state::INTERNAL_IP);
|
|
return internal_ip && _seeds.contains(inet_address(internal_ip->value));
|
|
});
|
|
logger.info("Known endpoints={}, current_seeds={}, seeds_from_config={}, seen_any_seed={}",
|
|
boost::copy_range<std::list<inet_address>>(endpoint_state_map | boost::adaptors::map_keys),
|
|
_seeds, _gcfg.seeds, seen);
|
|
if (!seen) {
|
|
dump_endpoint_state_map();
|
|
throw std::runtime_error("Unable to contact any seeds!");
|
|
}
|
|
}
|
|
|
|
bool gossiper::is_seed(const gms::inet_address& endpoint) const {
|
|
return _seeds.contains(endpoint);
|
|
}
|
|
|
|
void gossiper::register_(shared_ptr<i_endpoint_state_change_subscriber> subscriber) {
|
|
_subscribers.add(subscriber);
|
|
}
|
|
|
|
future<> gossiper::unregister_(shared_ptr<i_endpoint_state_change_subscriber> subscriber) {
|
|
return _subscribers.remove(subscriber);
|
|
}
|
|
|
|
std::set<inet_address> gossiper::get_live_members() {
|
|
std::set<inet_address> live_members(_live_endpoints.begin(), _live_endpoints.end());
|
|
auto myip = get_broadcast_address();
|
|
logger.debug("live_members before={}", live_members);
|
|
live_members.insert(myip);
|
|
if (is_shutdown(myip)) {
|
|
live_members.erase(myip);
|
|
}
|
|
logger.debug("live_members after={}", live_members);
|
|
return live_members;
|
|
}
|
|
|
|
std::set<inet_address> gossiper::get_live_token_owners() {
|
|
std::set<inet_address> token_owners;
|
|
for (auto& member : get_live_members()) {
|
|
auto es = get_endpoint_state_for_endpoint_ptr(member);
|
|
if (es && !is_dead_state(*es) && get_token_metadata_ptr()->is_member(member)) {
|
|
token_owners.insert(member);
|
|
}
|
|
}
|
|
return token_owners;
|
|
}
|
|
|
|
std::set<inet_address> gossiper::get_unreachable_token_owners() {
|
|
std::set<inet_address> token_owners;
|
|
for (auto&& x : _unreachable_endpoints) {
|
|
auto& endpoint = x.first;
|
|
if (get_token_metadata_ptr()->is_member(endpoint)) {
|
|
token_owners.insert(endpoint);
|
|
}
|
|
}
|
|
return token_owners;
|
|
}
|
|
|
|
// Return downtime in microseconds
|
|
int64_t gossiper::get_endpoint_downtime(inet_address ep) const noexcept {
|
|
auto it = _unreachable_endpoints.find(ep);
|
|
if (it != _unreachable_endpoints.end()) {
|
|
auto& downtime = it->second;
|
|
return std::chrono::duration_cast<std::chrono::microseconds>(now() - downtime).count();
|
|
} else {
|
|
return 0L;
|
|
}
|
|
}
|
|
|
|
// Depends on
|
|
// - on_dead callbacks
|
|
// It is called from failure_detector
|
|
future<> gossiper::convict(inet_address endpoint) {
|
|
auto* state = get_endpoint_state_for_endpoint_ptr(endpoint);
|
|
if (!state || !state->is_alive()) {
|
|
co_return;
|
|
}
|
|
if (is_shutdown(endpoint)) {
|
|
co_await mark_as_shutdown(endpoint);
|
|
} else {
|
|
co_await mark_dead(endpoint, *state);
|
|
}
|
|
}
|
|
|
|
std::set<inet_address> gossiper::get_unreachable_members() {
|
|
std::set<inet_address> ret;
|
|
for (auto&& x : _unreachable_endpoints) {
|
|
ret.insert(x.first);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
int gossiper::get_max_endpoint_state_version(endpoint_state state) const noexcept {
|
|
int max_version = state.get_heart_beat_state().get_heart_beat_version();
|
|
for (auto& entry : state.get_application_state_map()) {
|
|
auto& value = entry.second;
|
|
max_version = std::max(max_version, value.version);
|
|
}
|
|
return max_version;
|
|
}
|
|
|
|
future<> gossiper::evict_from_membership(inet_address endpoint) {
|
|
auto permit = co_await lock_endpoint(endpoint);
|
|
_unreachable_endpoints.erase(endpoint);
|
|
co_await container().invoke_on_all([endpoint] (auto& g) {
|
|
g.endpoint_state_map.erase(endpoint);
|
|
});
|
|
_expire_time_endpoint_map.erase(endpoint);
|
|
quarantine_endpoint(endpoint);
|
|
logger.debug("evicting {} from gossip", endpoint);
|
|
}
|
|
|
|
void gossiper::quarantine_endpoint(inet_address endpoint) {
|
|
quarantine_endpoint(endpoint, now());
|
|
}
|
|
|
|
void gossiper::quarantine_endpoint(inet_address endpoint, clk::time_point quarantine_start) {
|
|
_just_removed_endpoints[endpoint] = quarantine_start;
|
|
}
|
|
|
|
void gossiper::make_random_gossip_digest(utils::chunked_vector<gossip_digest>& g_digests) {
|
|
int generation = 0;
|
|
int max_version = 0;
|
|
|
|
// local epstate will be part of endpoint_state_map
|
|
utils::chunked_vector<inet_address> endpoints;
|
|
for (auto&& x : endpoint_state_map) {
|
|
endpoints.push_back(x.first);
|
|
}
|
|
std::shuffle(endpoints.begin(), endpoints.end(), _random_engine);
|
|
for (auto& endpoint : endpoints) {
|
|
auto es = get_endpoint_state_for_endpoint_ptr(endpoint);
|
|
if (es) {
|
|
auto& eps = *es;
|
|
generation = eps.get_heart_beat_state().get_generation();
|
|
max_version = get_max_endpoint_state_version(eps);
|
|
}
|
|
g_digests.push_back(gossip_digest(endpoint, generation, max_version));
|
|
}
|
|
#if 0
|
|
if (logger.isTraceEnabled()) {
|
|
StringBuilder sb = new StringBuilder();
|
|
for (GossipDigest g_digest : g_digests)
|
|
{
|
|
sb.append(g_digest);
|
|
sb.append(" ");
|
|
}
|
|
logger.trace("Gossip Digests are : {}", sb);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
future<> gossiper::replicate(inet_address ep, const endpoint_state& es) {
|
|
return container().invoke_on_all([ep, es, orig = this_shard_id(), self = shared_from_this()] (gossiper& g) {
|
|
if (this_shard_id() != orig) {
|
|
g.endpoint_state_map[ep].add_application_state(es);
|
|
}
|
|
});
|
|
}
|
|
|
|
future<> gossiper::replicate(inet_address ep, const std::map<application_state, versioned_value>& src, const utils::chunked_vector<application_state>& changed) {
|
|
return container().invoke_on_all([ep, &src, &changed, orig = this_shard_id(), self = shared_from_this()] (gossiper& g) {
|
|
if (this_shard_id() != orig) {
|
|
for (auto&& key : changed) {
|
|
g.endpoint_state_map[ep].add_application_state(key, src.at(key));
|
|
}
|
|
}
|
|
});
|
|
}
|
|
|
|
future<> gossiper::replicate(inet_address ep, application_state key, const versioned_value& value) {
|
|
return container().invoke_on_all([ep, key, &value, orig = this_shard_id(), self = shared_from_this()] (gossiper& g) {
|
|
if (this_shard_id() != orig) {
|
|
g.endpoint_state_map[ep].add_application_state(key, value);
|
|
}
|
|
});
|
|
}
|
|
|
|
future<> gossiper::advertise_removing(inet_address endpoint, utils::UUID host_id, utils::UUID local_host_id) {
|
|
auto& state = get_endpoint_state(endpoint);
|
|
// remember this node's generation
|
|
int generation = state.get_heart_beat_state().get_generation();
|
|
logger.info("Removing host: {}", host_id);
|
|
auto ring_delay = std::chrono::milliseconds(_gcfg.ring_delay_ms);
|
|
logger.info("Sleeping for {}ms to ensure {} does not change", ring_delay.count(), endpoint);
|
|
co_await sleep_abortable(ring_delay, _abort_source);
|
|
// make sure it did not change
|
|
auto& eps = get_endpoint_state(endpoint);
|
|
if (eps.get_heart_beat_state().get_generation() != generation) {
|
|
throw std::runtime_error(format("Endpoint {} generation changed while trying to remove it", endpoint));
|
|
}
|
|
|
|
// update the other node's generation to mimic it as if it had changed it itself
|
|
logger.info("Advertising removal for {}", endpoint);
|
|
eps.update_timestamp(); // make sure we don't evict it too soon
|
|
eps.get_heart_beat_state().force_newer_generation_unsafe();
|
|
eps.add_application_state(application_state::STATUS, versioned_value::removing_nonlocal(host_id));
|
|
eps.add_application_state(application_state::REMOVAL_COORDINATOR, versioned_value::removal_coordinator(local_host_id));
|
|
endpoint_state_map[endpoint] = eps;
|
|
co_await replicate(endpoint, eps);
|
|
}
|
|
|
|
future<> gossiper::advertise_token_removed(inet_address endpoint, utils::UUID host_id) {
|
|
auto& eps = get_endpoint_state(endpoint);
|
|
eps.update_timestamp(); // make sure we don't evict it too soon
|
|
eps.get_heart_beat_state().force_newer_generation_unsafe();
|
|
auto expire_time = compute_expire_time();
|
|
eps.add_application_state(application_state::STATUS, versioned_value::removed_nonlocal(host_id, expire_time.time_since_epoch().count()));
|
|
logger.info("Completing removal of {}", endpoint);
|
|
add_expire_time_for_endpoint(endpoint, expire_time);
|
|
endpoint_state_map[endpoint] = eps;
|
|
co_await replicate(endpoint, eps);
|
|
// ensure at least one gossip round occurs before returning
|
|
co_await sleep_abortable(INTERVAL * 2, _abort_source);
|
|
}
|
|
|
|
future<> gossiper::unsafe_assassinate_endpoint(sstring address) {
|
|
logger.warn("Gossiper.unsafeAssassinateEndpoint is deprecated and will be removed in the next release; use assassinate_endpoint instead");
|
|
return assassinate_endpoint(address);
|
|
}
|
|
|
|
future<> gossiper::assassinate_endpoint(sstring address) {
|
|
return container().invoke_on(0, [address] (auto&& gossiper) {
|
|
return seastar::async([&gossiper, g = gossiper.shared_from_this(), address] {
|
|
inet_address endpoint(address);
|
|
auto permit = gossiper.lock_endpoint(endpoint).get0();
|
|
auto es = gossiper.get_endpoint_state_for_endpoint_ptr(endpoint);
|
|
auto now = gossiper.now();
|
|
int gen = std::chrono::duration_cast<std::chrono::seconds>((now + std::chrono::seconds(60)).time_since_epoch()).count();
|
|
int ver = 9999;
|
|
endpoint_state ep_state = es ? *es : endpoint_state(heart_beat_state(gen, ver));
|
|
std::vector<dht::token> tokens;
|
|
logger.warn("Assassinating {} via gossip", endpoint);
|
|
if (es) {
|
|
tokens = gossiper.get_token_metadata_ptr()->get_tokens(endpoint);
|
|
if (tokens.empty()) {
|
|
logger.warn("Unable to calculate tokens for {}. Will use a random one", address);
|
|
throw std::runtime_error(format("Unable to calculate tokens for {}", endpoint));
|
|
}
|
|
|
|
int generation = ep_state.get_heart_beat_state().get_generation();
|
|
int heartbeat = ep_state.get_heart_beat_state().get_heart_beat_version();
|
|
auto ring_delay = std::chrono::milliseconds(gossiper._gcfg.ring_delay_ms);
|
|
logger.info("Sleeping for {} ms to ensure {} does not change", ring_delay.count(), endpoint);
|
|
// make sure it did not change
|
|
sleep_abortable(ring_delay, gossiper._abort_source).get();
|
|
|
|
es = gossiper.get_endpoint_state_for_endpoint_ptr(endpoint);
|
|
if (!es) {
|
|
logger.warn("Endpoint {} disappeared while trying to assassinate, continuing anyway", endpoint);
|
|
} else {
|
|
auto& new_state = *es;
|
|
if (new_state.get_heart_beat_state().get_generation() != generation) {
|
|
throw std::runtime_error(format("Endpoint still alive: {} generation changed while trying to assassinate it", endpoint));
|
|
} else if (new_state.get_heart_beat_state().get_heart_beat_version() != heartbeat) {
|
|
throw std::runtime_error(format("Endpoint still alive: {} heartbeat changed while trying to assassinate it", endpoint));
|
|
}
|
|
}
|
|
ep_state.update_timestamp(); // make sure we don't evict it too soon
|
|
ep_state.get_heart_beat_state().force_newer_generation_unsafe();
|
|
}
|
|
|
|
// do not pass go, do not collect 200 dollars, just gtfo
|
|
std::unordered_set<dht::token> tokens_set(tokens.begin(), tokens.end());
|
|
auto expire_time = gossiper.compute_expire_time();
|
|
ep_state.add_application_state(application_state::STATUS, versioned_value::left(tokens_set, expire_time.time_since_epoch().count()));
|
|
gossiper.handle_major_state_change(endpoint, ep_state).get();
|
|
sleep_abortable(INTERVAL * 4, gossiper._abort_source).get();
|
|
logger.warn("Finished assassinating {}", endpoint);
|
|
});
|
|
});
|
|
}
|
|
|
|
bool gossiper::is_known_endpoint(inet_address endpoint) const noexcept {
|
|
return endpoint_state_map.contains(endpoint);
|
|
}
|
|
|
|
future<int> gossiper::get_current_generation_number(inet_address endpoint) {
|
|
return container().invoke_on(0, [endpoint] (auto&& gossiper) {
|
|
return gossiper.get_endpoint_state(endpoint).get_heart_beat_state().get_generation();
|
|
});
|
|
}
|
|
|
|
future<int> gossiper::get_current_heart_beat_version(inet_address endpoint) {
|
|
return container().invoke_on(0, [endpoint] (auto&& gossiper) {
|
|
return gossiper.get_endpoint_state(endpoint).get_heart_beat_state().get_heart_beat_version();
|
|
});
|
|
}
|
|
|
|
future<> gossiper::do_gossip_to_live_member(gossip_digest_syn message, gms::inet_address ep) {
|
|
return send_gossip(message, {ep});
|
|
}
|
|
|
|
future<> gossiper::do_gossip_to_unreachable_member(gossip_digest_syn message) {
|
|
double live_endpoint_count = _live_endpoints.size();
|
|
double unreachable_endpoint_count = _unreachable_endpoints.size();
|
|
if (unreachable_endpoint_count > 0) {
|
|
/* based on some probability */
|
|
double prob = unreachable_endpoint_count / (live_endpoint_count + 1);
|
|
std::uniform_real_distribution<double> dist(0, 1);
|
|
double rand_dbl = dist(_random_engine);
|
|
if (rand_dbl < prob) {
|
|
std::set<inet_address> addrs;
|
|
for (auto&& x : _unreachable_endpoints) {
|
|
// Ignore the node which is decommissioned
|
|
if (get_gossip_status(x.first) != sstring(versioned_value::STATUS_LEFT)) {
|
|
addrs.insert(x.first);
|
|
}
|
|
}
|
|
logger.trace("do_gossip_to_unreachable_member: live_endpoint nr={} unreachable_endpoints nr={}",
|
|
live_endpoint_count, unreachable_endpoint_count);
|
|
return send_gossip(message, addrs);
|
|
}
|
|
}
|
|
return make_ready_future<>();
|
|
}
|
|
|
|
bool gossiper::is_gossip_only_member(inet_address endpoint) {
|
|
auto es = get_endpoint_state_for_endpoint_ptr(endpoint);
|
|
if (!es) {
|
|
return false;
|
|
}
|
|
return !is_dead_state(*es) && !get_token_metadata_ptr()->is_member(endpoint);
|
|
}
|
|
|
|
clk::time_point gossiper::get_expire_time_for_endpoint(inet_address endpoint) const noexcept {
|
|
/* default expire_time is A_VERY_LONG_TIME */
|
|
auto it = _expire_time_endpoint_map.find(endpoint);
|
|
if (it == _expire_time_endpoint_map.end()) {
|
|
return compute_expire_time();
|
|
} else {
|
|
auto stored_time = it->second;
|
|
return stored_time;
|
|
}
|
|
}
|
|
|
|
const endpoint_state* gossiper::get_endpoint_state_for_endpoint_ptr(inet_address ep) const noexcept {
|
|
auto it = endpoint_state_map.find(ep);
|
|
if (it == endpoint_state_map.end()) {
|
|
return nullptr;
|
|
} else {
|
|
return &it->second;
|
|
}
|
|
}
|
|
|
|
endpoint_state* gossiper::get_endpoint_state_for_endpoint_ptr(inet_address ep) noexcept {
|
|
auto it = endpoint_state_map.find(ep);
|
|
if (it == endpoint_state_map.end()) {
|
|
return nullptr;
|
|
} else {
|
|
return &it->second;
|
|
}
|
|
}
|
|
|
|
endpoint_state& gossiper::get_endpoint_state(inet_address ep) {
|
|
auto ptr = get_endpoint_state_for_endpoint_ptr(ep);
|
|
if (!ptr) {
|
|
throw std::out_of_range(format("ep={}", ep));
|
|
}
|
|
return *ptr;
|
|
}
|
|
|
|
std::optional<endpoint_state> gossiper::get_endpoint_state_for_endpoint(inet_address ep) const noexcept {
|
|
auto it = endpoint_state_map.find(ep);
|
|
if (it == endpoint_state_map.end()) {
|
|
return {};
|
|
} else {
|
|
return it->second;
|
|
}
|
|
}
|
|
|
|
future<> gossiper::reset_endpoint_state_map() {
|
|
_unreachable_endpoints.clear();
|
|
_live_endpoints.clear();
|
|
co_await update_live_endpoints_version();
|
|
co_await container().invoke_on_all([] (gossiper& g) {
|
|
g.endpoint_state_map.clear();
|
|
});
|
|
}
|
|
|
|
const std::unordered_map<inet_address, endpoint_state>& gms::gossiper::get_endpoint_states() const noexcept {
|
|
return endpoint_state_map;
|
|
}
|
|
|
|
bool gossiper::uses_host_id(inet_address endpoint) const {
|
|
return _messaging.knows_version(endpoint) ||
|
|
get_application_state_ptr(endpoint, application_state::NET_VERSION);
|
|
}
|
|
|
|
bool gossiper::is_cql_ready(const inet_address& endpoint) const {
|
|
// Note:
|
|
// - New scylla node always send application_state::RPC_READY = false when
|
|
// the node boots and send application_state::RPC_READY = true when cql
|
|
// server is up
|
|
// - Old scylla node that does not support the application_state::RPC_READY
|
|
// never has application_state::RPC_READY in the endpoint_state, we can
|
|
// only think their cql server is up, so we return true here if
|
|
// application_state::RPC_READY is not present
|
|
auto* eps = get_endpoint_state_for_endpoint_ptr(endpoint);
|
|
if (!eps) {
|
|
logger.debug("Node {} does not have RPC_READY application_state, return is_cql_ready=true", endpoint);
|
|
return true;
|
|
}
|
|
auto ready = eps->is_cql_ready();
|
|
logger.debug("Node {}: is_cql_ready={}", endpoint, ready);
|
|
return ready;
|
|
}
|
|
|
|
utils::UUID gossiper::get_host_id(inet_address endpoint) const {
|
|
if (!uses_host_id(endpoint)) {
|
|
throw std::runtime_error(format("Host {} does not use new-style tokens!", endpoint));
|
|
}
|
|
auto app_state = get_application_state_ptr(endpoint, application_state::HOST_ID);
|
|
if (!app_state) {
|
|
throw std::runtime_error(format("Host {} does not have HOST_ID application_state", endpoint));
|
|
}
|
|
return utils::UUID(app_state->value);
|
|
}
|
|
|
|
std::optional<endpoint_state> gossiper::get_state_for_version_bigger_than(inet_address for_endpoint, int version) {
|
|
std::optional<endpoint_state> reqd_endpoint_state;
|
|
auto es = get_endpoint_state_for_endpoint_ptr(for_endpoint);
|
|
if (es) {
|
|
auto& eps = *es;
|
|
/*
|
|
* Here we try to include the Heart Beat state only if it is
|
|
* greater than the version passed in. It might happen that
|
|
* the heart beat version maybe lesser than the version passed
|
|
* in and some application state has a version that is greater
|
|
* than the version passed in. In this case we also send the old
|
|
* heart beat and throw it away on the receiver if it is redundant.
|
|
*/
|
|
int local_hb_version = eps.get_heart_beat_state().get_heart_beat_version();
|
|
if (local_hb_version > version) {
|
|
reqd_endpoint_state.emplace(eps.get_heart_beat_state());
|
|
logger.trace("local heartbeat version {} greater than {} for {}", local_hb_version, version, for_endpoint);
|
|
}
|
|
/* Accumulate all application states whose versions are greater than "version" variable */
|
|
for (auto& entry : eps.get_application_state_map()) {
|
|
auto& value = entry.second;
|
|
if (value.version > version) {
|
|
if (!reqd_endpoint_state) {
|
|
reqd_endpoint_state.emplace(eps.get_heart_beat_state());
|
|
}
|
|
auto& key = entry.first;
|
|
logger.trace("Adding state of {}, {}: {}" , for_endpoint, key, value.value);
|
|
reqd_endpoint_state->add_application_state(key, value);
|
|
}
|
|
}
|
|
}
|
|
return reqd_endpoint_state;
|
|
}
|
|
|
|
int gossiper::compare_endpoint_startup(inet_address addr1, inet_address addr2) {
|
|
auto* ep1 = get_endpoint_state_for_endpoint_ptr(addr1);
|
|
auto* ep2 = get_endpoint_state_for_endpoint_ptr(addr2);
|
|
if (!ep1 || !ep2) {
|
|
auto err = format("Can not get endpoint_state for {} or {}", addr1, addr2);
|
|
logger.warn("{}", err);
|
|
throw std::runtime_error(err);
|
|
}
|
|
return ep1->get_heart_beat_state().get_generation() - ep2->get_heart_beat_state().get_generation();
|
|
}
|
|
|
|
void gossiper::update_timestamp_for_nodes(const std::map<inet_address, endpoint_state>& map) {
|
|
for (const auto& x : map) {
|
|
const gms::inet_address& endpoint = x.first;
|
|
const endpoint_state& remote_endpoint_state = x.second;
|
|
auto* local_endpoint_state = get_endpoint_state_for_endpoint_ptr(endpoint);
|
|
if (local_endpoint_state) {
|
|
bool update = false;
|
|
int local_generation = local_endpoint_state->get_heart_beat_state().get_generation();
|
|
int remote_generation = remote_endpoint_state.get_heart_beat_state().get_generation();
|
|
if (remote_generation > local_generation) {
|
|
update = true;
|
|
} else if (remote_generation == local_generation) {
|
|
int local_version = get_max_endpoint_state_version(*local_endpoint_state);
|
|
int remote_version = remote_endpoint_state.get_heart_beat_state().get_heart_beat_version();
|
|
if (remote_version > local_version) {
|
|
update = true;
|
|
}
|
|
}
|
|
if (update) {
|
|
logger.trace("Updated timestamp for node {}", endpoint);
|
|
local_endpoint_state->update_timestamp();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void gossiper::mark_alive(inet_address addr, endpoint_state& local_state) {
|
|
// if (MessagingService.instance().getVersion(addr) < MessagingService.VERSION_20) {
|
|
// real_mark_alive(addr, local_state);
|
|
// return;
|
|
// }
|
|
auto inserted = _pending_mark_alive_endpoints.insert(addr).second;
|
|
if (inserted) {
|
|
// The node is not in the _pending_mark_alive_endpoints
|
|
logger.debug("Mark Node {} alive with EchoMessage", addr);
|
|
} else {
|
|
// We are in the progress of marking this node alive
|
|
logger.debug("Node {} is being marked as up, ignoring duplicated mark alive operation", addr);
|
|
return;
|
|
}
|
|
|
|
local_state.mark_dead();
|
|
msg_addr id = get_msg_addr(addr);
|
|
int64_t generation = endpoint_state_map[get_broadcast_address()].get_heart_beat_state().get_generation();
|
|
logger.debug("Sending a EchoMessage to {}, with generation_number={}", id, generation);
|
|
// Do it in the background.
|
|
(void)_messaging.send_gossip_echo(id, generation, std::chrono::milliseconds(15000)).then([this, addr] {
|
|
logger.trace("Got EchoMessage Reply");
|
|
// After sending echo message, the Node might not be in the
|
|
// endpoint_state_map anymore, use the reference of local_state
|
|
// might cause user-after-free
|
|
auto es = get_endpoint_state_for_endpoint_ptr(addr);
|
|
if (!es) {
|
|
logger.info("Node {} is not in endpoint_state_map anymore", addr);
|
|
} else {
|
|
endpoint_state& state = *es;
|
|
logger.debug("Mark Node {} alive after EchoMessage", addr);
|
|
return real_mark_alive(addr, state);
|
|
}
|
|
return make_ready_future();
|
|
}).finally([this, addr] {
|
|
_pending_mark_alive_endpoints.erase(addr);
|
|
}).handle_exception([addr] (auto ep) {
|
|
logger.warn("Fail to send EchoMessage to {}: {}", addr, ep);
|
|
});
|
|
}
|
|
|
|
future<> gossiper::real_mark_alive(inet_address addr, endpoint_state& local_state) {
|
|
logger.trace("marking as alive {}", addr);
|
|
|
|
// Do not mark a node with status shutdown as UP.
|
|
auto status = sstring(get_gossip_status(local_state));
|
|
if (status == sstring(versioned_value::SHUTDOWN)) {
|
|
logger.warn("Skip marking node {} with status = {} as UP", addr, status);
|
|
co_return;
|
|
}
|
|
|
|
local_state.mark_alive();
|
|
local_state.update_timestamp(); // prevents do_status_check from racing us and evicting if it was down > A_VERY_LONG_TIME
|
|
|
|
logger.debug("removing expire time for endpoint : {}", addr);
|
|
_unreachable_endpoints.erase(addr);
|
|
_expire_time_endpoint_map.erase(addr);
|
|
|
|
auto it_ = std::find(_live_endpoints.begin(), _live_endpoints.end(), addr);
|
|
bool was_live = it_ != _live_endpoints.end();
|
|
if (was_live) {
|
|
co_return;
|
|
}
|
|
|
|
// Make a copy for endpoint_state because the code below can yield
|
|
endpoint_state state = local_state;
|
|
_live_endpoints.push_back(addr);
|
|
co_await update_live_endpoints_version();
|
|
if (_endpoints_to_talk_with.empty()) {
|
|
_endpoints_to_talk_with.push_back({addr});
|
|
} else {
|
|
_endpoints_to_talk_with.front().push_back(addr);
|
|
}
|
|
|
|
if (!is_in_shadow_round()) {
|
|
logger.info("InetAddress {} is now UP, status = {}", addr, status);
|
|
}
|
|
|
|
co_await _subscribers.for_each([addr, state] (shared_ptr<i_endpoint_state_change_subscriber> subscriber) -> future<> {
|
|
co_await subscriber->on_alive(addr, state);
|
|
logger.trace("Notified {}", fmt::ptr(subscriber.get()));
|
|
});
|
|
}
|
|
|
|
future<> gossiper::mark_dead(inet_address addr, endpoint_state& local_state) {
|
|
logger.trace("marking as down {}", addr);
|
|
local_state.mark_dead();
|
|
endpoint_state state = local_state;
|
|
_live_endpoints.resize(std::distance(_live_endpoints.begin(), std::remove(_live_endpoints.begin(), _live_endpoints.end(), addr)));
|
|
co_await update_live_endpoints_version();
|
|
_unreachable_endpoints[addr] = now();
|
|
logger.info("InetAddress {} is now DOWN, status = {}", addr, get_gossip_status(state));
|
|
co_await _subscribers.for_each([addr, state] (shared_ptr<i_endpoint_state_change_subscriber> subscriber) -> future<> {
|
|
co_await subscriber->on_dead(addr, state);
|
|
logger.trace("Notified {}", fmt::ptr(subscriber.get()));
|
|
});
|
|
}
|
|
|
|
future<> gossiper::handle_major_state_change(inet_address ep, const endpoint_state& eps) {
|
|
auto eps_old = get_endpoint_state_for_endpoint(ep);
|
|
if (!is_dead_state(eps) && !is_in_shadow_round()) {
|
|
if (endpoint_state_map.contains(ep)) {
|
|
logger.debug("Node {} has restarted, now UP, status = {}", ep, get_gossip_status(eps));
|
|
} else {
|
|
logger.debug("Node {} is now part of the cluster, status = {}", ep, get_gossip_status(eps));
|
|
}
|
|
}
|
|
logger.trace("Adding endpoint state for {}, status = {}", ep, get_gossip_status(eps));
|
|
endpoint_state_map[ep] = eps;
|
|
co_await replicate(ep, eps);
|
|
|
|
if (is_in_shadow_round()) {
|
|
// In shadow round, we only interested in the peer's endpoint_state,
|
|
// e.g., gossip features, host_id, tokens. No need to call the
|
|
// on_restart or on_join callbacks or to go through the mark alive
|
|
// procedure with EchoMessage gossip message. We will do them during
|
|
// normal gossip runs anyway.
|
|
logger.debug("In shadow round addr={}, eps={}", ep, eps);
|
|
co_return;
|
|
}
|
|
|
|
if (eps_old) {
|
|
// the node restarted: it is up to the subscriber to take whatever action is necessary
|
|
co_await _subscribers.for_each([ep, eps_old] (shared_ptr<i_endpoint_state_change_subscriber> subscriber) {
|
|
return subscriber->on_restart(ep, *eps_old);
|
|
});
|
|
}
|
|
|
|
auto& ep_state = endpoint_state_map.at(ep);
|
|
if (!is_dead_state(ep_state)) {
|
|
mark_alive(ep, ep_state);
|
|
} else {
|
|
logger.debug("Not marking {} alive due to dead state {}", ep, get_gossip_status(eps));
|
|
co_await mark_dead(ep, ep_state);
|
|
}
|
|
|
|
auto* eps_new = get_endpoint_state_for_endpoint_ptr(ep);
|
|
if (eps_new) {
|
|
co_await _subscribers.for_each([ep, eps_new] (shared_ptr<i_endpoint_state_change_subscriber> subscriber) {
|
|
return subscriber->on_join(ep, *eps_new);
|
|
});
|
|
}
|
|
// check this at the end so nodes will learn about the endpoint
|
|
if (is_shutdown(ep)) {
|
|
co_await mark_as_shutdown(ep);
|
|
}
|
|
}
|
|
|
|
bool gossiper::is_dead_state(const endpoint_state& eps) const {
|
|
auto state = get_gossip_status(eps);
|
|
for (auto& deadstate : DEAD_STATES) {
|
|
if (state == deadstate) {
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
bool gossiper::is_shutdown(const inet_address& endpoint) const {
|
|
return get_gossip_status(endpoint) == sstring(versioned_value::SHUTDOWN);
|
|
}
|
|
|
|
bool gossiper::is_normal(const inet_address& endpoint) const {
|
|
return get_gossip_status(endpoint) == sstring(versioned_value::STATUS_NORMAL);
|
|
}
|
|
|
|
bool gossiper::is_left(const inet_address& endpoint) const {
|
|
return get_gossip_status(endpoint) == sstring(versioned_value::STATUS_LEFT);
|
|
}
|
|
|
|
bool gossiper::is_normal_ring_member(const inet_address& endpoint) const {
|
|
auto status = get_gossip_status(endpoint);
|
|
return status == sstring(versioned_value::STATUS_NORMAL) || status == sstring(versioned_value::SHUTDOWN);
|
|
}
|
|
|
|
bool gossiper::is_silent_shutdown_state(const endpoint_state& ep_state) const{
|
|
auto state = get_gossip_status(ep_state);
|
|
for (auto& deadstate : SILENT_SHUTDOWN_STATES) {
|
|
if (state == deadstate) {
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
future<> gossiper::apply_new_states(inet_address addr, endpoint_state& local_state, const endpoint_state& remote_state) {
|
|
// don't assert here, since if the node restarts the version will go back to zero
|
|
//int oldVersion = local_state.get_heart_beat_state().get_heart_beat_version();
|
|
|
|
local_state.set_heart_beat_state_and_update_timestamp(remote_state.get_heart_beat_state());
|
|
// if (logger.isTraceEnabled()) {
|
|
// logger.trace("Updating heartbeat state version to {} from {} for {} ...",
|
|
// local_state.get_heart_beat_state().get_heart_beat_version(), oldVersion, addr);
|
|
// }
|
|
|
|
utils::chunked_vector<application_state> changed;
|
|
auto&& remote_map = remote_state.get_application_state_map();
|
|
|
|
std::exception_ptr ep;
|
|
try {
|
|
// we need to make two loops here, one to apply, then another to notify,
|
|
// this way all states in an update are present and current when the notifications are received
|
|
for (const auto& remote_entry : remote_map) {
|
|
const auto& remote_key = remote_entry.first;
|
|
const auto& remote_value = remote_entry.second;
|
|
auto remote_gen = remote_state.get_heart_beat_state().get_generation();
|
|
auto local_gen = local_state.get_heart_beat_state().get_generation();
|
|
if(remote_gen != local_gen) {
|
|
auto err = format("Remote generation {:d} != local generation {:d}", remote_gen, local_gen);
|
|
logger.warn("{}", err);
|
|
throw std::runtime_error(err);
|
|
}
|
|
|
|
const versioned_value* local_val = local_state.get_application_state_ptr(remote_key);
|
|
if (!local_val || remote_value.version > local_val->version) {
|
|
changed.push_back(remote_key);
|
|
local_state.add_application_state(remote_key, remote_value);
|
|
}
|
|
}
|
|
} catch (...) {
|
|
ep = std::current_exception();
|
|
}
|
|
|
|
// We must replicate endpoint states before listeners run.
|
|
// Exceptions during replication will cause abort because node's state
|
|
// would be inconsistent across shards. Changes listeners depend on state
|
|
// being replicated to all shards.
|
|
co_await replicate(addr, remote_map, changed);
|
|
|
|
// Exceptions thrown from listeners will result in abort because that could leave the node in a bad
|
|
// state indefinitely. Unless the value changes again, we wouldn't retry notifications.
|
|
// Some values are set only once, so listeners would never be re-run.
|
|
// Listeners should decide which failures are non-fatal and swallow them.
|
|
for (auto&& key : changed) {
|
|
co_await do_on_change_notifications(addr, key, remote_map.at(key));
|
|
}
|
|
|
|
maybe_rethrow_exception(std::move(ep));
|
|
}
|
|
|
|
future<> gossiper::do_before_change_notifications(inet_address addr, const endpoint_state& ep_state, const application_state& ap_state, const versioned_value& new_value) {
|
|
co_await _subscribers.for_each([addr, ep_state, ap_state, new_value] (shared_ptr<i_endpoint_state_change_subscriber> subscriber) {
|
|
return subscriber->before_change(addr, ep_state, ap_state, new_value);
|
|
});
|
|
}
|
|
|
|
future<> gossiper::do_on_change_notifications(inet_address addr, const application_state& state, const versioned_value& value) {
|
|
co_await _subscribers.for_each([addr, state, value] (shared_ptr<i_endpoint_state_change_subscriber> subscriber) {
|
|
return subscriber->on_change(addr, state, value);
|
|
});
|
|
}
|
|
|
|
void gossiper::request_all(gossip_digest& g_digest,
|
|
utils::chunked_vector<gossip_digest>& delta_gossip_digest_list, int remote_generation) {
|
|
/* We are here since we have no data for this endpoint locally so request everthing. */
|
|
delta_gossip_digest_list.emplace_back(g_digest.get_endpoint(), remote_generation, 0);
|
|
logger.trace("request_all for {}", g_digest.get_endpoint());
|
|
}
|
|
|
|
void gossiper::send_all(gossip_digest& g_digest,
|
|
std::map<inet_address, endpoint_state>& delta_ep_state_map,
|
|
int max_remote_version) {
|
|
auto ep = g_digest.get_endpoint();
|
|
logger.trace("send_all(): ep={}, version > {}", ep, max_remote_version);
|
|
auto local_ep_state_ptr = get_state_for_version_bigger_than(ep, max_remote_version);
|
|
if (local_ep_state_ptr) {
|
|
delta_ep_state_map[ep] = *local_ep_state_ptr;
|
|
}
|
|
}
|
|
|
|
void gossiper::examine_gossiper(utils::chunked_vector<gossip_digest>& g_digest_list,
|
|
utils::chunked_vector<gossip_digest>& delta_gossip_digest_list,
|
|
std::map<inet_address, endpoint_state>& delta_ep_state_map) {
|
|
if (g_digest_list.size() == 0) {
|
|
/* we've been sent a *completely* empty syn, which should normally
|
|
* never happen since an endpoint will at least send a syn with
|
|
* itself. If this is happening then the node is attempting shadow
|
|
* gossip, and we should reply with everything we know.
|
|
*/
|
|
logger.debug("Shadow request received, adding all states");
|
|
for (auto& entry : endpoint_state_map) {
|
|
g_digest_list.emplace_back(entry.first, 0, 0);
|
|
}
|
|
}
|
|
for (gossip_digest& g_digest : g_digest_list) {
|
|
int remote_generation = g_digest.get_generation();
|
|
int max_remote_version = g_digest.get_max_version();
|
|
/* Get state associated with the end point in digest */
|
|
auto&& ep = g_digest.get_endpoint();
|
|
auto es = get_endpoint_state_for_endpoint_ptr(ep);
|
|
/* Here we need to fire a GossipDigestAckMessage. If we have some
|
|
* data associated with this endpoint locally then we follow the
|
|
* "if" path of the logic. If we have absolutely nothing for this
|
|
* endpoint we need to request all the data for this endpoint.
|
|
*/
|
|
if (es) {
|
|
endpoint_state& ep_state_ptr = *es;
|
|
int local_generation = ep_state_ptr.get_heart_beat_state().get_generation();
|
|
/* get the max version of all keys in the state associated with this endpoint */
|
|
int max_local_version = get_max_endpoint_state_version(ep_state_ptr);
|
|
logger.trace("examine_gossiper(): ep={}, remote={}.{}, local={}.{}", ep,
|
|
remote_generation, max_remote_version, local_generation, max_local_version);
|
|
if (remote_generation == local_generation && max_remote_version == max_local_version) {
|
|
continue;
|
|
}
|
|
|
|
if (remote_generation > local_generation) {
|
|
/* we request everything from the gossiper */
|
|
request_all(g_digest, delta_gossip_digest_list, remote_generation);
|
|
} else if (remote_generation < local_generation) {
|
|
/* send all data with generation = localgeneration and version > 0 */
|
|
send_all(g_digest, delta_ep_state_map, 0);
|
|
} else if (remote_generation == local_generation) {
|
|
/*
|
|
* If the max remote version is greater then we request the
|
|
* remote endpoint send us all the data for this endpoint
|
|
* with version greater than the max version number we have
|
|
* locally for this endpoint.
|
|
*
|
|
* If the max remote version is lesser, then we send all
|
|
* the data we have locally for this endpoint with version
|
|
* greater than the max remote version.
|
|
*/
|
|
if (max_remote_version > max_local_version) {
|
|
logger.trace("examine_gossiper(): requesting version > {} from {}", max_local_version, g_digest.get_endpoint());
|
|
delta_gossip_digest_list.emplace_back(g_digest.get_endpoint(), remote_generation, max_local_version);
|
|
} else if (max_remote_version < max_local_version) {
|
|
/* send all data with generation = localgeneration and version > max_remote_version */
|
|
send_all(g_digest, delta_ep_state_map, max_remote_version);
|
|
}
|
|
}
|
|
} else {
|
|
/* We are here since we have no data for this endpoint locally so request everything. */
|
|
request_all(g_digest, delta_gossip_digest_list, remote_generation);
|
|
}
|
|
}
|
|
}
|
|
|
|
future<> gossiper::start_gossiping(int generation_nbr, std::map<application_state, versioned_value> preload_local_states, gms::advertise_myself advertise) {
|
|
co_await container().invoke_on_all([advertise] (gossiper& g) {
|
|
if (!advertise) {
|
|
g._advertise_myself = false;
|
|
}
|
|
});
|
|
|
|
build_seeds_list();
|
|
if (_force_gossip_generation() > 0) {
|
|
generation_nbr = _force_gossip_generation();
|
|
logger.warn("Use the generation number provided by user: generation = {}", generation_nbr);
|
|
}
|
|
endpoint_state& local_state = endpoint_state_map[get_broadcast_address()];
|
|
local_state.set_heart_beat_state_and_update_timestamp(heart_beat_state(generation_nbr));
|
|
local_state.mark_alive();
|
|
for (auto& entry : preload_local_states) {
|
|
local_state.add_application_state(entry.first, entry.second);
|
|
}
|
|
|
|
auto generation = local_state.get_heart_beat_state().get_generation();
|
|
|
|
co_await replicate(get_broadcast_address(), local_state);
|
|
|
|
logger.trace("gossip started with generation {}", generation);
|
|
_enabled = true;
|
|
_nr_run = 0;
|
|
_scheduled_gossip_task.arm(INTERVAL);
|
|
co_await container().invoke_on_all([] (gms::gossiper& g) {
|
|
g._enabled = true;
|
|
g._failure_detector_loop_done = g.failure_detector_loop();
|
|
});
|
|
}
|
|
|
|
future<std::unordered_map<gms::inet_address, int32_t>>
|
|
gossiper::get_generation_for_nodes(std::list<gms::inet_address> nodes) {
|
|
std::unordered_map<gms::inet_address, int32_t> ret;
|
|
for (const auto& node : nodes) {
|
|
auto es = get_endpoint_state_for_endpoint_ptr(node);
|
|
if (es) {
|
|
auto current_generation_number = es->get_heart_beat_state().get_generation();
|
|
ret.emplace(node, current_generation_number);
|
|
} else {
|
|
return make_exception_future<std::unordered_map<gms::inet_address, int32_t>>(
|
|
std::runtime_error(format("Can not find generation number for node={}", node)));
|
|
}
|
|
}
|
|
return make_ready_future<std::unordered_map<gms::inet_address, int32_t>>(std::move(ret));
|
|
}
|
|
|
|
future<> gossiper::advertise_to_nodes(std::unordered_map<gms::inet_address, int32_t> advertise_to_nodes) {
|
|
return container().invoke_on_all([advertise_to_nodes] (auto& g) {
|
|
g._advertise_to_nodes = advertise_to_nodes;
|
|
g._advertise_myself = true;
|
|
});
|
|
}
|
|
|
|
future<> gossiper::do_shadow_round(std::unordered_set<gms::inet_address> nodes) {
|
|
return seastar::async([this, g = this->shared_from_this(), nodes = std::move(nodes)] () mutable {
|
|
nodes.erase(get_broadcast_address());
|
|
gossip_get_endpoint_states_request request{{
|
|
gms::application_state::STATUS,
|
|
gms::application_state::HOST_ID,
|
|
gms::application_state::TOKENS,
|
|
gms::application_state::SUPPORTED_FEATURES,
|
|
gms::application_state::SNITCH_NAME}};
|
|
logger.info("Gossip shadow round started with nodes={}", nodes);
|
|
std::unordered_set<gms::inet_address> nodes_talked;
|
|
size_t nodes_down = 0;
|
|
auto start_time = clk::now();
|
|
bool fall_back_to_syn_msg = false;
|
|
std::list<gms::gossip_get_endpoint_states_response> responses;
|
|
for (;;) {
|
|
parallel_for_each(nodes.begin(), nodes.end(), [this, &request, &responses, &nodes_talked, &nodes_down, &fall_back_to_syn_msg] (gms::inet_address node) {
|
|
logger.debug("Sent get_endpoint_states request to {}, request={}", node, request.application_states);
|
|
return _messaging.send_gossip_get_endpoint_states(msg_addr(node), std::chrono::milliseconds(5000), request).then(
|
|
[node, &nodes_talked, &responses] (gms::gossip_get_endpoint_states_response response) {
|
|
logger.debug("Got get_endpoint_states response from {}, response={}", node, response.endpoint_state_map);
|
|
responses.push_back(std::move(response));
|
|
nodes_talked.insert(node);
|
|
}).handle_exception_type([node, &fall_back_to_syn_msg] (seastar::rpc::unknown_verb_error&) {
|
|
logger.warn("Node {} does not support get_endpoint_states verb", node);
|
|
fall_back_to_syn_msg = true;
|
|
}).handle_exception_type([node, &nodes_down] (seastar::rpc::timeout_error&) {
|
|
logger.warn("The get_endpoint_states verb to node {} was timeout", node);
|
|
}).handle_exception_type([node, &nodes_down] (seastar::rpc::closed_error&) {
|
|
nodes_down++;
|
|
logger.warn("Node {} is down for get_endpoint_states verb", node);
|
|
});
|
|
}).get();
|
|
for (auto& response : responses) {
|
|
apply_state_locally_without_listener_notification(response.endpoint_state_map).get();
|
|
}
|
|
if (!nodes_talked.empty()) {
|
|
break;
|
|
}
|
|
if (nodes_down == nodes.size()) {
|
|
logger.warn("All nodes={} are down for get_endpoint_states verb. Skip ShadowRound.", nodes);
|
|
break;
|
|
}
|
|
if (fall_back_to_syn_msg) {
|
|
break;
|
|
}
|
|
if (clk::now() > start_time + std::chrono::milliseconds(_gcfg.shadow_round_ms)) {
|
|
throw std::runtime_error(format("Unable to gossip with any nodes={} (ShadowRound).", nodes));
|
|
}
|
|
sleep_abortable(std::chrono::seconds(1), _abort_source).get();
|
|
logger.info("Connect nodes={} again ... ({} seconds passed)",
|
|
nodes, std::chrono::duration_cast<std::chrono::seconds>(clk::now() - start_time).count());
|
|
}
|
|
if (fall_back_to_syn_msg) {
|
|
logger.info("Fallback to old method for ShadowRound");
|
|
auto t = clk::now();
|
|
goto_shadow_round();
|
|
while (is_in_shadow_round()) {
|
|
// send a completely empty syn
|
|
for (const auto& node : nodes) {
|
|
utils::chunked_vector<gossip_digest> digests;
|
|
gossip_digest_syn message(get_cluster_name(), get_partitioner_name(), digests);
|
|
auto id = get_msg_addr(node);
|
|
logger.trace("Sending a GossipDigestSyn (ShadowRound) to {} ...", id);
|
|
// Do it in the background.
|
|
(void)_messaging.send_gossip_digest_syn(id, std::move(message)).handle_exception([id] (auto ep) {
|
|
logger.trace("Fail to send GossipDigestSyn (ShadowRound) to {}: {}", id, ep);
|
|
});
|
|
}
|
|
sleep_abortable(std::chrono::seconds(1), _abort_source).get();
|
|
if (is_in_shadow_round()) {
|
|
if (clk::now() > t + std::chrono::milliseconds(_gcfg.shadow_round_ms)) {
|
|
throw std::runtime_error(format("Unable to gossip with any nodes={} (ShadowRound),", nodes));
|
|
}
|
|
logger.info("Connect nodes={} again ... ({} seconds passed)",
|
|
nodes, std::chrono::duration_cast<std::chrono::seconds>(clk::now() - t).count());
|
|
}
|
|
}
|
|
}
|
|
logger.info("Gossip shadow round finisehd with nodes_talked={}", nodes_talked);
|
|
});
|
|
}
|
|
|
|
void gossiper::build_seeds_list() {
|
|
for (inet_address seed : get_seeds() ) {
|
|
if (seed == get_broadcast_address()) {
|
|
continue;
|
|
}
|
|
_seeds.emplace(seed);
|
|
}
|
|
}
|
|
|
|
void gossiper::maybe_initialize_local_state(int generation_nbr) {
|
|
heart_beat_state hb_state(generation_nbr);
|
|
endpoint_state local_state(hb_state);
|
|
local_state.mark_alive();
|
|
inet_address ep = get_broadcast_address();
|
|
if (!endpoint_state_map.contains(ep)) {
|
|
endpoint_state_map.emplace(ep, local_state);
|
|
}
|
|
}
|
|
|
|
future<> gossiper::add_saved_endpoint(inet_address ep) {
|
|
if (ep == get_broadcast_address()) {
|
|
logger.debug("Attempt to add self as saved endpoint");
|
|
co_return;
|
|
}
|
|
|
|
//preserve any previously known, in-memory data about the endpoint (such as DC, RACK, and so on)
|
|
auto ep_state = endpoint_state(heart_beat_state(0));
|
|
auto es = get_endpoint_state_for_endpoint_ptr(ep);
|
|
if (es) {
|
|
ep_state = *es;
|
|
logger.debug("not replacing a previous ep_state for {}, but reusing it: {}", ep, ep_state);
|
|
ep_state.set_heart_beat_state_and_update_timestamp(heart_beat_state(0));
|
|
}
|
|
const auto tmptr = get_token_metadata_ptr();
|
|
auto tokens = tmptr->get_tokens(ep);
|
|
if (!tokens.empty()) {
|
|
std::unordered_set<dht::token> tokens_set(tokens.begin(), tokens.end());
|
|
ep_state.add_application_state(gms::application_state::TOKENS, versioned_value::tokens(tokens_set));
|
|
}
|
|
auto host_id = tmptr->get_host_id_if_known(ep);
|
|
if (host_id) {
|
|
ep_state.add_application_state(gms::application_state::HOST_ID, versioned_value::host_id(host_id.value()));
|
|
}
|
|
ep_state.mark_dead();
|
|
endpoint_state_map[ep] = ep_state;
|
|
co_await replicate(ep, ep_state);
|
|
_unreachable_endpoints[ep] = now();
|
|
logger.trace("Adding saved endpoint {} {}", ep, ep_state.get_heart_beat_state().get_generation());
|
|
}
|
|
|
|
future<> gossiper::add_local_application_state(application_state state, versioned_value value) {
|
|
return add_local_application_state({ {std::move(state), std::move(value)} });
|
|
}
|
|
|
|
future<> gossiper::add_local_application_state(std::initializer_list<std::pair<application_state, utils::in<versioned_value>>> args) {
|
|
using in_pair_type = std::pair<application_state, utils::in<versioned_value>>;
|
|
using out_pair_type = std::pair<application_state, versioned_value>;
|
|
using vector_type = std::list<out_pair_type>;
|
|
|
|
return add_local_application_state(boost::copy_range<vector_type>(args | boost::adaptors::transformed([](const in_pair_type& p) {
|
|
return out_pair_type(p.first, p.second.move());
|
|
})));
|
|
}
|
|
|
|
|
|
// Depends on:
|
|
// - before_change callbacks
|
|
// - on_change callbacks
|
|
// #2894. Similar to origin fix, but relies on non-interruptability to ensure we apply
|
|
// values "in order".
|
|
//
|
|
// NOTE: having the values being actual versioned values here is sort of pointless, because
|
|
// we overwrite the version to ensure the set is monotonic. However, it does not break anything,
|
|
// and changing this tends to spread widely (see versioned_value::factory), so that can be its own
|
|
// change later, if needed.
|
|
// Retaining the slightly broken signature is also cosistent with origin. Hooray.
|
|
//
|
|
future<> gossiper::add_local_application_state(std::list<std::pair<application_state, versioned_value>> states) {
|
|
if (states.empty()) {
|
|
return make_ready_future<>();
|
|
}
|
|
return container().invoke_on(0, [states = std::move(states)] (gossiper& gossiper) mutable {
|
|
return seastar::async([g = gossiper.shared_from_this(), states = std::move(states)]() mutable {
|
|
auto& gossiper = *g;
|
|
inet_address ep_addr = gossiper.get_broadcast_address();
|
|
// for symmetry with other apply, use endpoint lock for our own address.
|
|
auto permit = gossiper.lock_endpoint(ep_addr).get0();
|
|
auto es = gossiper.get_endpoint_state_for_endpoint_ptr(ep_addr);
|
|
if (!es) {
|
|
auto err = format("endpoint_state_map does not contain endpoint = {}, application_states = {}",
|
|
ep_addr, states);
|
|
throw std::runtime_error(err);
|
|
}
|
|
|
|
endpoint_state ep_state_before = *es;
|
|
|
|
for (auto& p : states) {
|
|
auto& state = p.first;
|
|
auto& value = p.second;
|
|
// Fire "before change" notifications:
|
|
// Not explicit, but apparently we allow this to defer (inside out implicit seastar::async)
|
|
gossiper.do_before_change_notifications(ep_addr, ep_state_before, state, value).get();
|
|
}
|
|
|
|
es = gossiper.get_endpoint_state_for_endpoint_ptr(ep_addr);
|
|
if (!es) {
|
|
return;
|
|
}
|
|
|
|
for (auto& p : states) {
|
|
auto& state = p.first;
|
|
auto& value = p.second;
|
|
// Notifications may have taken some time, so preventively raise the version
|
|
// of the new value, otherwise it could be ignored by the remote node
|
|
// if another value with a newer version was received in the meantime:
|
|
value = versioned_value::clone_with_higher_version(value);
|
|
// Add to local application state
|
|
es->add_application_state(state, value);
|
|
}
|
|
for (auto& p : states) {
|
|
auto& state = p.first;
|
|
auto& value = p.second;
|
|
// fire "on change" notifications:
|
|
// now we might defer again, so this could be reordered. But we've
|
|
// ensured the whole set of values are monotonically versioned and
|
|
// applied to endpoint state.
|
|
gossiper.replicate(ep_addr, state, value).get();
|
|
gossiper.do_on_change_notifications(ep_addr, state, value).get();
|
|
}
|
|
}).handle_exception([] (auto ep) {
|
|
logger.warn("Fail to apply application_state: {}", ep);
|
|
});
|
|
});
|
|
}
|
|
|
|
future<> gossiper::do_stop_gossiping() {
|
|
if (!is_enabled()) {
|
|
logger.info("gossip is already stopped");
|
|
return make_ready_future<>();
|
|
}
|
|
return seastar::async([this, g = this->shared_from_this()] {
|
|
auto* my_ep_state = get_endpoint_state_for_endpoint_ptr(get_broadcast_address());
|
|
if (my_ep_state) {
|
|
logger.info("My status = {}", get_gossip_status(*my_ep_state));
|
|
}
|
|
if (my_ep_state && !is_silent_shutdown_state(*my_ep_state)) {
|
|
int local_generation = my_ep_state->get_heart_beat_state().get_generation();
|
|
logger.info("Announcing shutdown");
|
|
add_local_application_state(application_state::STATUS, versioned_value::shutdown(true)).get();
|
|
auto live_endpoints = _live_endpoints;
|
|
for (inet_address addr : live_endpoints) {
|
|
msg_addr id = get_msg_addr(addr);
|
|
logger.info("Sending a GossipShutdown to {} with generation {}", id.addr, local_generation);
|
|
_messaging.send_gossip_shutdown(id, get_broadcast_address(), local_generation).then_wrapped([id] (auto&&f) {
|
|
try {
|
|
f.get();
|
|
logger.trace("Got GossipShutdown Reply");
|
|
} catch (...) {
|
|
logger.warn("Fail to send GossipShutdown to {}: {}", id, std::current_exception());
|
|
}
|
|
return make_ready_future<>();
|
|
}).get();
|
|
}
|
|
sleep(std::chrono::milliseconds(_gcfg.shutdown_announce_ms)).get();
|
|
} else {
|
|
logger.warn("No local state or state is in silent shutdown, not announcing shutdown");
|
|
}
|
|
logger.info("Disable and wait for gossip loop started");
|
|
// Set disable flag and cancel the timer makes sure gossip loop will not be scheduled
|
|
container().invoke_on_all([] (gms::gossiper& g) {
|
|
g._enabled = false;
|
|
}).get();
|
|
_scheduled_gossip_task.cancel();
|
|
// Take the semaphore makes sure existing gossip loop is finished
|
|
get_units(_callback_running, 1).get0();
|
|
container().invoke_on_all([] (auto& g) {
|
|
return std::move(g._failure_detector_loop_done);
|
|
}).get();
|
|
logger.info("Gossip is now stopped");
|
|
});
|
|
}
|
|
|
|
future<> gossiper::start() {
|
|
init_messaging_service_handler();
|
|
return make_ready_future();
|
|
}
|
|
|
|
future<> gossiper::shutdown() {
|
|
if (!_background_msg.is_closed()) {
|
|
co_await _background_msg.close();
|
|
}
|
|
if (this_shard_id() == 0) {
|
|
co_await do_stop_gossiping();
|
|
}
|
|
}
|
|
|
|
future<> gossiper::stop() {
|
|
co_await shutdown();
|
|
co_await uninit_messaging_service_handler();
|
|
}
|
|
|
|
bool gossiper::is_enabled() const {
|
|
return _enabled;
|
|
}
|
|
|
|
void gossiper::goto_shadow_round() {
|
|
_in_shadow_round = true;
|
|
}
|
|
|
|
void gossiper::finish_shadow_round() {
|
|
_in_shadow_round = false;
|
|
}
|
|
|
|
bool gossiper::is_in_shadow_round() const {
|
|
return _in_shadow_round;
|
|
}
|
|
|
|
void gossiper::add_expire_time_for_endpoint(inet_address endpoint, clk::time_point expire_time) {
|
|
char expire_time_buf[100];
|
|
auto expire_time_tm = clk::to_time_t(expire_time);
|
|
auto now_ = now();
|
|
::tm t_buf;
|
|
strftime(expire_time_buf, sizeof(expire_time_buf), "%Y-%m-%d %T", ::localtime_r(&expire_time_tm, &t_buf));
|
|
auto diff = std::chrono::duration_cast<std::chrono::seconds>(expire_time - now_).count();
|
|
logger.info("Node {} will be removed from gossip at [{}]: (expire = {}, now = {}, diff = {} seconds)",
|
|
endpoint, expire_time_buf, expire_time.time_since_epoch().count(),
|
|
now_.time_since_epoch().count(), diff);
|
|
_expire_time_endpoint_map[endpoint] = expire_time;
|
|
}
|
|
|
|
clk::time_point gossiper::compute_expire_time() {
|
|
return now() + A_VERY_LONG_TIME;
|
|
}
|
|
|
|
void gossiper::dump_endpoint_state_map() {
|
|
logger.info("=== endpoint_state_map dump starts == ");
|
|
for (auto& x : endpoint_state_map) {
|
|
logger.info("endpoint={}, endpoint_state={}", x.first, x.second);
|
|
}
|
|
logger.info("=== endpoint_state_map dump ends ===");
|
|
}
|
|
|
|
bool gossiper::is_alive(inet_address ep) const {
|
|
if (ep == get_broadcast_address()) {
|
|
return true;
|
|
}
|
|
auto* eps = get_endpoint_state_for_endpoint_ptr(std::move(ep));
|
|
// we could assert not-null, but having isAlive fail screws a node over so badly that
|
|
// it's worth being defensive here so minor bugs don't cause disproportionate
|
|
// badness. (See CASSANDRA-1463 for an example).
|
|
if (eps) {
|
|
return eps->is_alive();
|
|
}
|
|
logger.warn("unknown endpoint {}", ep);
|
|
return false;
|
|
}
|
|
|
|
future<> gossiper::wait_alive(std::vector<gms::inet_address> nodes, std::chrono::milliseconds timeout) {
|
|
auto start_time = std::chrono::steady_clock::now();
|
|
for (;;) {
|
|
std::vector<gms::inet_address> live_nodes;
|
|
for (const auto& node: nodes) {
|
|
size_t nr_alive = co_await container().map_reduce0([node] (gossiper& g) -> size_t {
|
|
return g.is_alive(node) ? 1 : 0;
|
|
}, 0, std::plus<size_t>());
|
|
logger.debug("Marked node={} as alive on {} out of {} shards", node, nr_alive, smp::count);
|
|
if (nr_alive == smp::count) {
|
|
live_nodes.push_back(node);
|
|
}
|
|
}
|
|
logger.debug("Waited for marking node as up, replace_nodes={}, live_nodes={}", nodes, live_nodes);
|
|
if (live_nodes.size() == nodes.size()) {
|
|
break;
|
|
}
|
|
if (std::chrono::steady_clock::now() > timeout + start_time) {
|
|
throw std::runtime_error(format("Failed to mark node as alive in {} ms, nodes={}, live_nodes={}",
|
|
timeout.count(), nodes, live_nodes));
|
|
}
|
|
co_await sleep_abortable(std::chrono::milliseconds(100), _abort_source);
|
|
}
|
|
}
|
|
|
|
const versioned_value* gossiper::get_application_state_ptr(inet_address endpoint, application_state appstate) const noexcept {
|
|
auto* eps = get_endpoint_state_for_endpoint_ptr(std::move(endpoint));
|
|
if (!eps) {
|
|
return nullptr;
|
|
}
|
|
return eps->get_application_state_ptr(appstate);
|
|
}
|
|
|
|
sstring gossiper::get_application_state_value(inet_address endpoint, application_state appstate) const {
|
|
auto v = get_application_state_ptr(endpoint, appstate);
|
|
if (!v) {
|
|
return {};
|
|
}
|
|
return v->value;
|
|
}
|
|
|
|
/**
|
|
* This method is used to mark a node as shutdown; that is it gracefully exited on its own and told us about it
|
|
* @param endpoint endpoint that has shut itself down
|
|
*/
|
|
future<> gossiper::mark_as_shutdown(const inet_address& endpoint) {
|
|
auto es = get_endpoint_state_for_endpoint_ptr(endpoint);
|
|
if (es) {
|
|
auto& ep_state = *es;
|
|
ep_state.add_application_state(application_state::STATUS, versioned_value::shutdown(true));
|
|
ep_state.get_heart_beat_state().force_highest_possible_version_unsafe();
|
|
co_await replicate(endpoint, ep_state);
|
|
co_await mark_dead(endpoint, ep_state);
|
|
co_await convict(endpoint);
|
|
}
|
|
}
|
|
|
|
void gossiper::force_newer_generation() {
|
|
auto es = get_endpoint_state_for_endpoint_ptr(get_broadcast_address());
|
|
if (es) {
|
|
es->get_heart_beat_state().force_newer_generation_unsafe();
|
|
}
|
|
}
|
|
|
|
static std::string_view do_get_gossip_status(const gms::versioned_value* app_state) noexcept {
|
|
if (!app_state) {
|
|
return gms::versioned_value::STATUS_UNKNOWN;
|
|
}
|
|
const auto& value = app_state->value;
|
|
auto pos = value.find(',');
|
|
if (!value.size() || !pos) {
|
|
return gms::versioned_value::STATUS_UNKNOWN;
|
|
}
|
|
if (pos == sstring::npos) {
|
|
return std::string_view(value);
|
|
}
|
|
return std::string_view(value.data(), pos);
|
|
}
|
|
|
|
std::string_view gossiper::get_gossip_status(const endpoint_state& ep_state) const noexcept {
|
|
return do_get_gossip_status(ep_state.get_application_state_ptr(application_state::STATUS));
|
|
}
|
|
|
|
std::string_view gossiper::get_gossip_status(const inet_address& endpoint) const noexcept {
|
|
return do_get_gossip_status(get_application_state_ptr(endpoint, application_state::STATUS));
|
|
}
|
|
|
|
future<> gossiper::wait_for_gossip(std::chrono::milliseconds initial_delay, std::optional<int32_t> force_after) {
|
|
static constexpr std::chrono::milliseconds GOSSIP_SETTLE_POLL_INTERVAL_MS{1000};
|
|
static constexpr int32_t GOSSIP_SETTLE_POLL_SUCCESSES_REQUIRED = 3;
|
|
|
|
if (force_after && *force_after == 0) {
|
|
logger.warn("Skipped to wait for gossip to settle by user request since skip_wait_for_gossip_to_settle is set zero. Do not use this in production!");
|
|
co_return;
|
|
}
|
|
|
|
int32_t total_polls = 0;
|
|
int32_t num_okay = 0;
|
|
int32_t ep_size = endpoint_state_map.size();
|
|
|
|
auto delay = initial_delay;
|
|
|
|
co_await sleep_abortable(GOSSIP_SETTLE_MIN_WAIT_MS, _abort_source);
|
|
while (num_okay < GOSSIP_SETTLE_POLL_SUCCESSES_REQUIRED) {
|
|
co_await sleep_abortable(delay, _abort_source);
|
|
delay = GOSSIP_SETTLE_POLL_INTERVAL_MS;
|
|
|
|
int32_t current_size = endpoint_state_map.size();
|
|
total_polls++;
|
|
if (current_size == ep_size && _msg_processing == 0) {
|
|
logger.debug("Gossip looks settled");
|
|
num_okay++;
|
|
} else {
|
|
logger.info("Gossip not settled after {} polls.", total_polls);
|
|
num_okay = 0;
|
|
}
|
|
ep_size = current_size;
|
|
if (force_after && *force_after > 0 && total_polls > *force_after) {
|
|
logger.warn("Gossip not settled but startup forced by skip_wait_for_gossip_to_settle. Gossp total polls: {}", total_polls);
|
|
break;
|
|
}
|
|
}
|
|
if (total_polls > GOSSIP_SETTLE_POLL_SUCCESSES_REQUIRED) {
|
|
logger.info("Gossip settled after {} extra polls; proceeding", total_polls - GOSSIP_SETTLE_POLL_SUCCESSES_REQUIRED);
|
|
} else {
|
|
logger.info("No gossip backlog; proceeding");
|
|
}
|
|
}
|
|
|
|
future<> gossiper::wait_for_gossip_to_settle() {
|
|
auto force_after = _gcfg.skip_wait_for_gossip_to_settle;
|
|
if (force_after != 0) {
|
|
co_await wait_for_gossip(GOSSIP_SETTLE_MIN_WAIT_MS, force_after);
|
|
}
|
|
if (!std::exchange(_gossip_settled, true)) {
|
|
co_await maybe_enable_features();
|
|
}
|
|
}
|
|
|
|
future<> gossiper::wait_for_range_setup() {
|
|
logger.info("Waiting for pending range setup...");
|
|
auto ring_delay = std::chrono::milliseconds(_gcfg.ring_delay_ms);
|
|
auto force_after = _gcfg.skip_wait_for_gossip_to_settle;
|
|
return wait_for_gossip(ring_delay, force_after);
|
|
}
|
|
|
|
bool gossiper::is_safe_for_bootstrap(inet_address endpoint) {
|
|
// We allow to bootstrap a new node in only two cases:
|
|
// 1) The node is a completely new node and no state in gossip at all
|
|
// 2) The node has state in gossip and it is already removed from the
|
|
// cluster either by nodetool decommission or nodetool removenode
|
|
auto* eps = get_endpoint_state_for_endpoint_ptr(endpoint);
|
|
bool allowed = true;
|
|
if (!eps) {
|
|
logger.debug("is_safe_for_bootstrap: node={}, status=no state in gossip, allowed_to_bootstrap={}", endpoint, allowed);
|
|
return allowed;
|
|
}
|
|
auto status = get_gossip_status(*eps);
|
|
std::unordered_set<std::string_view> allowed_statuses{
|
|
versioned_value::STATUS_LEFT,
|
|
versioned_value::REMOVED_TOKEN,
|
|
};
|
|
allowed = allowed_statuses.contains(status);
|
|
logger.debug("is_safe_for_bootstrap: node={}, status={}, allowed_to_bootstrap={}", endpoint, status, allowed);
|
|
return allowed;
|
|
}
|
|
|
|
std::set<sstring> gossiper::get_supported_features(inet_address endpoint) const {
|
|
auto app_state = get_application_state_ptr(endpoint, application_state::SUPPORTED_FEATURES);
|
|
if (!app_state) {
|
|
return {};
|
|
}
|
|
return feature_service::to_feature_set(app_state->value);
|
|
}
|
|
|
|
std::set<sstring> gossiper::get_supported_features(const std::unordered_map<gms::inet_address, sstring>& loaded_peer_features, ignore_features_of_local_node ignore_local_node) const {
|
|
std::unordered_map<gms::inet_address, std::set<sstring>> features_map;
|
|
std::set<sstring> common_features;
|
|
|
|
for (auto& x : loaded_peer_features) {
|
|
auto features = feature_service::to_feature_set(x.second);
|
|
if (features.empty()) {
|
|
logger.warn("Loaded empty features for peer node {}", x.first);
|
|
} else {
|
|
features_map.emplace(x.first, std::move(features));
|
|
}
|
|
}
|
|
|
|
for (auto& x : endpoint_state_map) {
|
|
auto endpoint = x.first;
|
|
auto features = get_supported_features(endpoint);
|
|
if (ignore_local_node && endpoint == get_broadcast_address()) {
|
|
logger.debug("Ignore SUPPORTED_FEATURES of local node: features={}", features);
|
|
continue;
|
|
}
|
|
if (features.empty()) {
|
|
auto it = loaded_peer_features.find(endpoint);
|
|
if (it != loaded_peer_features.end()) {
|
|
logger.info("Node {} does not contain SUPPORTED_FEATURES in gossip, using features saved in system table, features={}", endpoint, feature_service::to_feature_set(it->second));
|
|
} else {
|
|
logger.warn("Node {} does not contain SUPPORTED_FEATURES in gossip or system table", endpoint);
|
|
}
|
|
} else {
|
|
// Replace the features with live info
|
|
features_map[endpoint] = std::move(features);
|
|
}
|
|
}
|
|
|
|
if (ignore_local_node) {
|
|
features_map.erase(get_broadcast_address());
|
|
}
|
|
|
|
if (!features_map.empty()) {
|
|
common_features = features_map.begin()->second;
|
|
}
|
|
|
|
for (auto& x : features_map) {
|
|
auto& features = x.second;
|
|
std::set<sstring> result;
|
|
std::set_intersection(features.begin(), features.end(),
|
|
common_features.begin(), common_features.end(),
|
|
std::inserter(result, result.end()));
|
|
common_features = std::move(result);
|
|
}
|
|
common_features.erase("");
|
|
return common_features;
|
|
}
|
|
|
|
void gossiper::check_knows_remote_features(std::set<std::string_view>& local_features, const std::unordered_map<inet_address, sstring>& loaded_peer_features) const {
|
|
auto local_endpoint = get_broadcast_address();
|
|
auto common_features = get_supported_features(loaded_peer_features, ignore_features_of_local_node::yes);
|
|
if (boost::range::includes(local_features, common_features)) {
|
|
logger.info("Feature check passed. Local node {} features = {}, Remote common_features = {}",
|
|
local_endpoint, local_features, common_features);
|
|
} else {
|
|
throw std::runtime_error(format("Feature check failed. This node can not join the cluster because it does not understand the feature. Local node {} features = {}, Remote common_features = {}", local_endpoint, local_features, common_features));
|
|
}
|
|
}
|
|
|
|
void gossiper::check_snitch_name_matches() const {
|
|
const auto& my_snitch_name = locator::i_endpoint_snitch::get_local_snitch_ptr()->get_name();
|
|
for (const auto& [address, state] : endpoint_state_map) {
|
|
const auto remote_snitch_name = state.get_application_state_ptr(application_state::SNITCH_NAME);
|
|
if (!remote_snitch_name) {
|
|
continue;
|
|
}
|
|
|
|
if (remote_snitch_name->value != my_snitch_name) {
|
|
throw std::runtime_error(format("Snitch check failed. This node cannot join the cluster because it uses {} and not {}", my_snitch_name, remote_snitch_name->value));
|
|
}
|
|
}
|
|
}
|
|
|
|
sstring gossiper::get_all_endpoint_states() {
|
|
std::stringstream ss;
|
|
for (auto& entry : endpoint_state_map) {
|
|
auto& ep = entry.first;
|
|
auto& state = entry.second;
|
|
ss << ep << "\n";
|
|
append_endpoint_state(ss, state);
|
|
}
|
|
return sstring(ss.str());
|
|
}
|
|
|
|
std::map<sstring, sstring> gossiper::get_simple_states() {
|
|
std::map<sstring, sstring> nodes_status;
|
|
for (auto& entry : endpoint_state_map) {
|
|
auto& ep = entry.first;
|
|
auto& state = entry.second;
|
|
std::stringstream ss;
|
|
ss << ep;
|
|
|
|
if (state.is_alive()) {
|
|
nodes_status.emplace(sstring(ss.str()), "UP");
|
|
} else {
|
|
nodes_status.emplace(sstring(ss.str()), "DOWN");
|
|
}
|
|
}
|
|
return nodes_status;
|
|
}
|
|
|
|
int gossiper::get_down_endpoint_count() const noexcept {
|
|
return endpoint_state_map.size() - get_up_endpoint_count();
|
|
}
|
|
|
|
int gossiper::get_up_endpoint_count() const noexcept {
|
|
return boost::count_if(endpoint_state_map | boost::adaptors::map_values, std::mem_fn(&endpoint_state::is_alive));
|
|
}
|
|
|
|
sstring gossiper::get_endpoint_state(sstring address) {
|
|
std::stringstream ss;
|
|
auto* eps = get_endpoint_state_for_endpoint_ptr(inet_address(address));
|
|
if (eps) {
|
|
append_endpoint_state(ss, *eps);
|
|
return sstring(ss.str());
|
|
} else {
|
|
return sstring("unknown endpoint ") + address;
|
|
}
|
|
}
|
|
|
|
void gossiper::append_endpoint_state(std::stringstream& ss, const endpoint_state& state) {
|
|
ss << " generation:" << state.get_heart_beat_state().get_generation() << "\n";
|
|
ss << " heartbeat:" << state.get_heart_beat_state().get_heart_beat_version() << "\n";
|
|
for (const auto& entry : state.get_application_state_map()) {
|
|
auto& app_state = entry.first;
|
|
auto& versioned_val = entry.second;
|
|
if (app_state == application_state::TOKENS) {
|
|
continue;
|
|
}
|
|
ss << " " << app_state << ":" << versioned_val.version << ":" << versioned_val.value << "\n";
|
|
}
|
|
const auto& app_state_map = state.get_application_state_map();
|
|
if (app_state_map.contains(application_state::TOKENS)) {
|
|
ss << " TOKENS:" << app_state_map.at(application_state::TOKENS).version << ":<hidden>\n";
|
|
} else {
|
|
ss << " TOKENS: not present" << "\n";
|
|
}
|
|
}
|
|
|
|
future<> gossiper::maybe_enable_features() {
|
|
if (!_gossip_settled) {
|
|
co_return;
|
|
}
|
|
auto loaded_peer_features = co_await db::system_keyspace::load_peer_features();
|
|
auto&& features = get_supported_features(loaded_peer_features, ignore_features_of_local_node::no);
|
|
co_await container().invoke_on_all([&features] (gossiper& g) {
|
|
// gms::feature::enable should be run within seastar::async context
|
|
return seastar::async([&features, &g] {
|
|
for (auto&& name : features) {
|
|
g._feature_service.enable(name);
|
|
}
|
|
});
|
|
});
|
|
}
|
|
|
|
locator::token_metadata_ptr gossiper::get_token_metadata_ptr() const noexcept {
|
|
return _shared_token_metadata.get();
|
|
}
|
|
|
|
inet_address_vector_replica_set gossiper::endpoint_filter(const sstring& local_rack, const std::unordered_map<sstring, std::unordered_set<gms::inet_address>>& endpoints) {
|
|
// special case for single-node data centers
|
|
if (endpoints.size() == 1 && endpoints.begin()->second.size() == 1) {
|
|
return boost::copy_range<inet_address_vector_replica_set>(endpoints.begin()->second);
|
|
}
|
|
|
|
// strip out dead endpoints and localhost
|
|
std::unordered_multimap<sstring, gms::inet_address> validated;
|
|
|
|
auto is_valid = [this ](gms::inet_address input) {
|
|
return input != utils::fb_utilities::get_broadcast_address()
|
|
&& is_alive(input)
|
|
;
|
|
};
|
|
|
|
for (auto& e : endpoints) {
|
|
for (auto& a : e.second) {
|
|
if (is_valid(a)) {
|
|
validated.emplace(e.first, a);
|
|
}
|
|
}
|
|
}
|
|
|
|
typedef inet_address_vector_replica_set return_type;
|
|
|
|
if (validated.size() <= 2) {
|
|
return boost::copy_range<return_type>(validated | boost::adaptors::map_values);
|
|
}
|
|
|
|
if (validated.size() - validated.count(local_rack) >= 2) {
|
|
// we have enough endpoints in other racks
|
|
validated.erase(local_rack);
|
|
}
|
|
|
|
if (validated.bucket_count() == 1) {
|
|
// we have only 1 `other` rack
|
|
auto res = validated | boost::adaptors::map_values;
|
|
if (validated.size() > 2) {
|
|
return boost::copy_range<return_type>(
|
|
boost::copy_range<std::vector<gms::inet_address>>(res)
|
|
| boost::adaptors::sliced(0, 2));
|
|
}
|
|
return boost::copy_range<return_type>(res);
|
|
}
|
|
|
|
// randomize which racks we pick from if more than 2 remaining
|
|
|
|
std::vector<sstring> racks = boost::copy_range<std::vector<sstring>>(validated | boost::adaptors::map_keys);
|
|
|
|
if (validated.bucket_count() > 2) {
|
|
std::shuffle(racks.begin(), racks.end(), _e1);
|
|
racks.resize(2);
|
|
}
|
|
|
|
inet_address_vector_replica_set result;
|
|
|
|
// grab a random member of up to two racks
|
|
for (auto& rack : racks) {
|
|
auto cpy = boost::copy_range<std::vector<gms::inet_address>>(validated.equal_range(rack) | boost::adaptors::map_values);
|
|
std::uniform_int_distribution<size_t> rdist(0, cpy.size() - 1);
|
|
result.emplace_back(cpy[rdist(_e1)]);
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
} // namespace gms
|