f3eade2f62
Drop the AGPL license in favor of a source-available license. See the blog post [1] for details. [1] https://www.scylladb.com/2024/12/18/why-were-moving-to-a-source-available-license/
346 lines
17 KiB
C++
346 lines
17 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: (LicenseRef-ScyllaDB-Source-Available-1.0 and Apache-2.0)
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*/
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#include "dht/range_streamer.hh"
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#include "replica/database.hh"
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#include "gms/gossiper.hh"
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#include "utils/log.hh"
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#include "streaming/stream_plan.hh"
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#include "db/config.hh"
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#include <fmt/ranges.h>
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#include <seastar/core/semaphore.hh>
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#include <seastar/core/sleep.hh>
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#include "utils/assert.hh"
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#include "utils/stall_free.hh"
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namespace dht {
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static logging::logger logger("range_streamer");
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using inet_address = gms::inet_address;
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std::unordered_map<locator::host_id, dht::token_range_vector>
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range_streamer::get_range_fetch_map(const std::unordered_map<dht::token_range, std::vector<locator::host_id>>& ranges_with_sources,
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const std::unordered_set<std::unique_ptr<i_source_filter>>& source_filters,
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const sstring& keyspace) {
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std::unordered_map<locator::host_id, dht::token_range_vector> range_fetch_map_map;
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const auto& topo = _token_metadata_ptr->get_topology();
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for (const auto& x : ranges_with_sources) {
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const dht::token_range& range_ = x.first;
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const std::vector<locator::host_id>& addresses = x.second;
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bool found_source = false;
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for (const auto& address : addresses) {
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if (topo.is_me(address)) {
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// If localhost is a source, we have found one, but we don't add it to the map to avoid streaming locally
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found_source = true;
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continue;
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}
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auto filtered = false;
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for (const auto& filter : source_filters) {
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if (!filter->should_include(get_token_metadata().get_topology(), address)) {
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filtered = true;
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break;
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}
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}
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if (filtered) {
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logger.debug("In get_range_fetch_map, keyspace = {}, endpoint= {} is filtered", keyspace, address);
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continue;
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}
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range_fetch_map_map[address].push_back(range_);
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found_source = true;
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break; // ensure we only stream from one other node for each range
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}
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if (!found_source) {
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auto& ks = _db.local().find_keyspace(keyspace);
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auto rf = ks.get_vnode_effective_replication_map()->get_replication_factor();
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// When a replacing node replaces a dead node with keyspace of RF
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// 1, it is expected that replacing node could not find a peer node
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// that contains data to stream from.
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if (_reason == streaming::stream_reason::replace && rf == 1) {
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logger.warn("Unable to find sufficient sources to stream range {} for keyspace {} with RF = 1 for replace operation", range_, keyspace);
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} else {
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throw std::runtime_error(format("unable to find sufficient sources for streaming range {} in keyspace {}", range_, keyspace));
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}
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}
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}
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return range_fetch_map_map;
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}
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// Must be called from a seastar thread
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std::unordered_map<dht::token_range, std::vector<locator::host_id>>
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range_streamer::get_all_ranges_with_sources_for(const sstring& keyspace_name, locator::vnode_effective_replication_map_ptr erm, dht::token_range_vector desired_ranges) {
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logger.debug("{} ks={}", __func__, keyspace_name);
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auto range_addresses = erm->get_range_host_ids().get();
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logger.debug("keyspace={}, desired_ranges.size={}, range_addresses.size={}", keyspace_name, desired_ranges.size(), range_addresses.size());
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std::unordered_map<dht::token_range, std::vector<locator::host_id>> range_sources;
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for (auto& desired_range : desired_ranges) {
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auto found = false;
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for (auto& x : range_addresses) {
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if (need_preempt()) {
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seastar::thread::yield();
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}
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const wrapping_interval<token>& src_range = x.first;
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if (src_range.contains(desired_range, dht::token_comparator{})) {
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host_id_vector_replica_set preferred(x.second.begin(), x.second.end());
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get_token_metadata().get_topology().sort_by_proximity(_address, preferred);
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for (locator::host_id& p : preferred) {
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range_sources[desired_range].push_back(p);
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}
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found = true;
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}
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}
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if (!found) {
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throw std::runtime_error(format("No sources found for {}", desired_range));
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}
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}
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return range_sources;
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}
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// Must be called from a seastar thread
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std::unordered_map<dht::token_range, std::vector<locator::host_id>>
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range_streamer::get_all_ranges_with_strict_sources_for(const sstring& keyspace_name, locator::vnode_effective_replication_map_ptr erm, dht::token_range_vector desired_ranges, gms::gossiper& gossiper) {
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logger.debug("{} ks={}", __func__, keyspace_name);
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SCYLLA_ASSERT (_tokens.empty() == false);
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auto& strat = erm->get_replication_strategy();
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//Active ranges
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auto metadata_clone = get_token_metadata().clone_only_token_map().get();
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auto range_addresses = strat.get_range_host_ids(metadata_clone).get();
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//Pending ranges
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metadata_clone.update_topology(_address, _dr);
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metadata_clone.update_normal_tokens(_tokens, _address).get();
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auto pending_range_addresses = strat.get_range_host_ids(metadata_clone).get();
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metadata_clone.clear_gently().get();
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//Collects the source that will have its range moved to the new node
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std::unordered_map<dht::token_range, std::vector<locator::host_id>> range_sources;
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logger.debug("keyspace={}, desired_ranges.size={}, range_addresses.size={}", keyspace_name, desired_ranges.size(), range_addresses.size());
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for (auto& desired_range : desired_ranges) {
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for (auto& x : range_addresses) {
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const wrapping_interval<token>& src_range = x.first;
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if (need_preempt()) {
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seastar::thread::yield();
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}
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if (src_range.contains(desired_range, dht::token_comparator{})) {
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std::vector<locator::host_id> old_endpoints(x.second.begin(), x.second.end());
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auto it = pending_range_addresses.find(desired_range);
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if (it == pending_range_addresses.end()) {
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throw std::runtime_error(format("Can not find desired_range = {} in pending_range_addresses", desired_range));
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}
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std::unordered_set<locator::host_id> new_endpoints(it->second.begin(), it->second.end());
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//Due to CASSANDRA-5953 we can have a higher RF then we have endpoints.
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//So we need to be careful to only be strict when endpoints == RF
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if (old_endpoints.size() == erm->get_replication_factor()) {
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std::erase_if(old_endpoints,
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[&new_endpoints] (locator::host_id ep) { return new_endpoints.contains(ep); });
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if (old_endpoints.size() != 1) {
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throw std::runtime_error(format("Expected 1 endpoint but found {:d}", old_endpoints.size()));
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}
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}
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range_sources[desired_range].push_back(old_endpoints.front());
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}
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}
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//Validate
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auto it = range_sources.find(desired_range);
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if (it == range_sources.end()) {
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throw std::runtime_error(format("No sources found for {}", desired_range));
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}
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if (it->second.size() != 1) {
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throw std::runtime_error(format("Multiple endpoints found for {}", desired_range));
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}
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locator::host_id source_id = it->second.front();
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if (gossiper.is_enabled() && !gossiper.is_alive(source_id)) {
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throw std::runtime_error(format("A node required to move the data consistently is down ({}). If you wish to move the data from a potentially inconsistent replica, restart the node with consistent_rangemovement=false", source_id));
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}
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}
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return range_sources;
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}
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bool range_streamer::use_strict_sources_for_ranges(const sstring& keyspace_name, const locator::vnode_effective_replication_map_ptr& erm) {
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auto rf = erm->get_replication_factor();
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auto nr_nodes_in_ring = get_token_metadata().get_normal_token_owners().size();
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bool everywhere_topology = erm->get_replication_strategy().get_type() == locator::replication_strategy_type::everywhere_topology;
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// Use strict when number of nodes in the ring is equal or more than RF
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auto strict = _db.local().get_config().consistent_rangemovement()
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&& !_tokens.empty()
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&& !everywhere_topology
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&& nr_nodes_in_ring >= rf;
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logger.debug("use_strict_sources_for_ranges: ks={}, nr_nodes_in_ring={}, rf={}, strict={}",
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keyspace_name, nr_nodes_in_ring, rf, strict);
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return strict;
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}
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void range_streamer::add_tx_ranges(const sstring& keyspace_name, std::unordered_map<locator::host_id, dht::token_range_vector> ranges_per_endpoint) {
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if (_nr_rx_added) {
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throw std::runtime_error("Mixed sending and receiving is not supported");
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}
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_nr_tx_added++;
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_to_stream.emplace(keyspace_name, std::move(ranges_per_endpoint));
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}
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void range_streamer::add_rx_ranges(const sstring& keyspace_name, std::unordered_map<locator::host_id, dht::token_range_vector> ranges_per_endpoint) {
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if (_nr_tx_added) {
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throw std::runtime_error("Mixed sending and receiving is not supported");
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}
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_nr_rx_added++;
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_to_stream.emplace(keyspace_name, std::move(ranges_per_endpoint));
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}
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// TODO: This is the legacy range_streamer interface, it is add_rx_ranges which adds rx ranges.
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future<> range_streamer::add_ranges(const sstring& keyspace_name, locator::vnode_effective_replication_map_ptr erm, dht::token_range_vector ranges, gms::gossiper& gossiper, bool is_replacing) {
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return seastar::async([this, keyspace_name, erm = std::move(erm), ranges= std::move(ranges), &gossiper, is_replacing] () mutable {
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if (_nr_tx_added) {
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throw std::runtime_error("Mixed sending and receiving is not supported");
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}
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_nr_rx_added++;
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auto ranges_for_keyspace = !is_replacing && use_strict_sources_for_ranges(keyspace_name, erm)
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? get_all_ranges_with_strict_sources_for(keyspace_name, erm, std::move(ranges), gossiper)
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: get_all_ranges_with_sources_for(keyspace_name, erm, std::move(ranges));
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if (logger.is_enabled(logging::log_level::debug)) {
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for (auto& x : ranges_for_keyspace) {
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logger.debug("{} : keyspace {} range {} exists on {}", _description, keyspace_name, x.first, x.second);
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}
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}
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std::unordered_map<locator::host_id, dht::token_range_vector> range_fetch_map = get_range_fetch_map(ranges_for_keyspace, _source_filters, keyspace_name);
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utils::clear_gently(ranges_for_keyspace).get();
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if (logger.is_enabled(logging::log_level::debug)) {
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for (auto& x : range_fetch_map) {
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logger.debug("{} : keyspace={}, ranges={} from source={}, range_size={}", _description, keyspace_name, x.second, x.first, x.second.size());
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}
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}
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_to_stream.emplace(keyspace_name, std::move(range_fetch_map));
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});
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}
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future<> range_streamer::stream_async() {
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_nr_ranges_remaining = nr_ranges_to_stream();
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_nr_total_ranges = _nr_ranges_remaining;
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_token_metadata_ptr = nullptr;
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logger.info("{} starts, nr_ranges_remaining={}", _description, _nr_ranges_remaining);
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auto start = lowres_clock::now();
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return do_for_each(_to_stream, [this, description = _description] (auto& stream) {
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const auto& keyspace = stream.first;
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auto& ip_range_vec = stream.second;
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auto ips = ip_range_vec | std::views::keys | std::ranges::to<std::list>();
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// Fetch from or send to peer node in parallel
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logger.info("{} with {} for keyspace={} started, nodes_to_stream={}", description, ips, keyspace, ip_range_vec.size());
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return parallel_for_each(ip_range_vec, [this, description, keyspace] (auto& ip_range) {
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auto& source = ip_range.first;
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auto& range_vec = ip_range.second;
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return seastar::with_semaphore(_limiter, 1, [this, description, keyspace, source, &range_vec] () mutable {
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return seastar::async([this, description, keyspace, source, &range_vec] () mutable {
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// TODO: It is better to use fiber instead of thread here because
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// creating a thread per peer can be some memory in a large cluster.
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auto start_time = lowres_clock::now();
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unsigned sp_index = 0;
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unsigned nr_ranges_streamed = 0;
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size_t nr_ranges_total = range_vec.size();
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auto do_streaming = [&] (dht::token_range_vector&& ranges_to_stream) {
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auto sp = stream_plan(_stream_manager.local(), format("{}-{}-index-{:d}", description, keyspace, sp_index++),
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_reason, _topo_guard);
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auto abort_listener = _abort_source.subscribe([&] () noexcept { sp.abort(); });
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_abort_source.check();
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logger.info("{} with {} for keyspace={}, streaming [{}, {}) out of {} ranges",
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description, source, keyspace,
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nr_ranges_streamed, nr_ranges_streamed + ranges_to_stream.size(), nr_ranges_total);
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auto ranges_streamed = ranges_to_stream.size();
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if (_nr_rx_added) {
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sp.request_ranges(source, keyspace, std::move(ranges_to_stream), _tables);
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} else if (_nr_tx_added) {
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sp.transfer_ranges(source, keyspace, std::move(ranges_to_stream), _tables);
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}
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sp.execute().discard_result().get();
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// Update finished percentage
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nr_ranges_streamed += ranges_streamed;
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_nr_ranges_remaining -= ranges_streamed;
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float percentage = _nr_total_ranges == 0 ? 1 : (_nr_total_ranges - _nr_ranges_remaining) / (float)_nr_total_ranges;
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_stream_manager.local().update_finished_percentage(_reason, percentage);
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logger.info("Finished {} out of {} ranges for {}, finished percentage={}",
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_nr_total_ranges - _nr_ranges_remaining, _nr_total_ranges, _reason, percentage);
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};
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dht::token_range_vector ranges_to_stream;
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try {
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for (auto it = range_vec.begin(); it < range_vec.end();) {
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ranges_to_stream.push_back(*it);
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++it;
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auto fraction = _db.local().get_config().stream_plan_ranges_fraction();
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size_t nr_ranges_per_stream_plan = nr_ranges_total * fraction;
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if (ranges_to_stream.size() < nr_ranges_per_stream_plan) {
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continue;
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} else {
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do_streaming(std::exchange(ranges_to_stream, {}));
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it = range_vec.erase(range_vec.begin(), it);
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}
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}
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if (ranges_to_stream.size() > 0) {
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do_streaming(std::exchange(ranges_to_stream, {}));
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range_vec.clear();
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}
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} catch (...) {
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auto t = std::chrono::duration_cast<std::chrono::duration<float>>(lowres_clock::now() - start_time).count();
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logger.warn("{} with {} for keyspace={} failed, took {} seconds: {}", description, source, keyspace, t, std::current_exception());
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throw;
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}
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auto t = std::chrono::duration_cast<std::chrono::duration<float>>(lowres_clock::now() - start_time).count();
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logger.info("{} with {} for keyspace={} succeeded, took {} seconds", description, source, keyspace, t);
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});
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});
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});
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}).finally([this, start] {
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auto t = std::chrono::duration_cast<std::chrono::seconds>(lowres_clock::now() - start).count();
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auto nr_ranges_remaining = nr_ranges_to_stream();
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if (nr_ranges_remaining) {
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logger.warn("{} failed, took {} seconds, nr_ranges_remaining={}", _description, t, nr_ranges_remaining);
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} else {
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logger.info("{} succeeded, took {} seconds, nr_ranges_remaining={}", _description, t, nr_ranges_remaining);
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}
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});
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}
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size_t range_streamer::nr_ranges_to_stream() {
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size_t nr_ranges_remaining = 0;
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for (auto& fetch : _to_stream) {
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const auto& keyspace = fetch.first;
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auto& ip_range_vec = fetch.second;
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for (auto& ip_range : ip_range_vec) {
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auto& source = ip_range.first;
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auto& range_vec = ip_range.second;
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nr_ranges_remaining += range_vec.size();
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logger.debug("Remaining: keyspace={}, source={}, ranges={}", keyspace, source, range_vec);
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}
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}
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return nr_ranges_remaining;
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}
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} // dht
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