mirror of
https://github.com/scylladb/scylladb.git
synced 2026-04-28 20:27:03 +00:00
4e236f3392
Tenant names starting with `$` are reserved for internal ones.
Forbid creating new service level which name starts with `$`
and log a warning for existing service levels with `$` prefix.
(cherry picked from commit d729d1b272)
Closes scylladb/scylladb#20198
601 lines
28 KiB
C++
601 lines
28 KiB
C++
/*
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* Copyright (C) 2020-present ScyllaDB
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*/
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/*
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* SPDX-License-Identifier: AGPL-3.0-or-later
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*/
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#include <boost/algorithm/string/join.hpp>
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#include <chrono>
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#include <seastar/core/sleep.hh>
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#include <seastar/core/thread.hh>
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#include <seastar/coroutine/parallel_for_each.hh>
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#include "cql3/untyped_result_set.hh"
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#include "db/consistency_level_type.hh"
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#include "db/system_keyspace.hh"
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#include <seastar/core/on_internal_error.hh>
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#include <seastar/core/timer.hh>
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#include "service/qos/raft_service_level_distributed_data_accessor.hh"
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#include "service/qos/standard_service_level_distributed_data_accessor.hh"
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#include "service_level_controller.hh"
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#include "db/system_distributed_keyspace.hh"
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#include "cql3/query_processor.hh"
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namespace qos {
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static logging::logger sl_logger("service_level_controller");
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sstring service_level_controller::default_service_level_name = "default";
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service_level_controller::service_level_controller(sharded<auth::service>& auth_service, locator::shared_token_metadata& tm, service_level_options default_service_level_config):
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_sl_data_accessor(nullptr),
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_auth_service(auth_service),
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_token_metadata(tm),
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_last_successful_config_update(seastar::lowres_clock::now()),
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_logged_intervals(0)
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{
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if (this_shard_id() == global_controller) {
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_global_controller_db = std::make_unique<global_controller_data>();
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_global_controller_db->default_service_level_config = default_service_level_config;
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}
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}
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future<> service_level_controller::add_service_level(sstring name, service_level_options slo, bool is_static) {
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return container().invoke_on(global_controller, [=] (service_level_controller &sl_controller) {
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return with_semaphore(sl_controller._global_controller_db->notifications_serializer, 1, [&sl_controller, name, slo, is_static] () {
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return sl_controller.do_add_service_level(name, slo, is_static);
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});
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});
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}
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future<> service_level_controller::remove_service_level(sstring name, bool remove_static) {
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return container().invoke_on(global_controller, [=] (service_level_controller &sl_controller) {
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return with_semaphore(sl_controller._global_controller_db->notifications_serializer, 1, [&sl_controller, name, remove_static] () {
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return sl_controller.do_remove_service_level(name, remove_static);
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});
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});
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}
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future<> service_level_controller::start() {
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if (this_shard_id() != global_controller) {
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return make_ready_future();
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}
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return with_semaphore(_global_controller_db->notifications_serializer, 1, [this] () {
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return do_add_service_level(default_service_level_name, _global_controller_db->default_service_level_config, true).then([this] () {
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return container().invoke_on_all([] (service_level_controller& sl) {
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sl._default_service_level = sl.get_service_level(default_service_level_name);
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});
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});
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});
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}
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void service_level_controller::set_distributed_data_accessor(service_level_distributed_data_accessor_ptr sl_data_accessor) {
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// unregistering the accessor is always legal
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if (!sl_data_accessor) {
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_sl_data_accessor = nullptr;
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}
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// Registration of a new accessor can be done only when the _sl_data_accessor is not already set.
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// This behavior is intended to allow to unit testing debug to set this value without having
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// overridden by storage_proxy
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if (!_sl_data_accessor) {
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_sl_data_accessor = sl_data_accessor;
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}
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}
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future<> service_level_controller::reload_distributed_data_accessor(cql3::query_processor& qp, service::raft_group0_client& g0, db::system_keyspace& sys_ks, db::system_distributed_keyspace& sys_dist_ks) {
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auto accessor = co_await qos::get_service_level_distributed_data_accessor_for_current_version(
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sys_ks,
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sys_dist_ks,
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qp,
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g0);
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set_distributed_data_accessor(std::move(accessor));
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}
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future<> service_level_controller::drain() {
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if (this_shard_id() != global_controller) {
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co_return;
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}
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// abort the loop of the distributed data checking if it is running
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if (!_global_controller_db->dist_data_update_aborter.abort_requested()) {
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_global_controller_db->dist_data_update_aborter.request_abort();
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}
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abort_group0_operations();
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_global_controller_db->notifications_serializer.broken();
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try {
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co_await std::exchange(_global_controller_db->distributed_data_update, make_ready_future<>());
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} catch (const broken_semaphore& ignored) {
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} catch (const sleep_aborted& ignored) {
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} catch (const exceptions::unavailable_exception& ignored) {
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} catch (const exceptions::read_timeout_exception& ignored) {
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}
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}
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future<> service_level_controller::stop() {
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return drain();
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}
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void service_level_controller::abort_group0_operations() {
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// abort group0 operations
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if (!_global_controller_db->group0_aborter.abort_requested()) {
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_global_controller_db->group0_aborter.request_abort();
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}
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}
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future<> service_level_controller::update_service_levels_from_distributed_data() {
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if (!_sl_data_accessor) {
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return make_ready_future();
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}
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if (this_shard_id() != global_controller) {
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return make_ready_future();
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}
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return with_semaphore(_global_controller_db->notifications_serializer, 1, [this] () {
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return async([this] () {
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service_levels_info service_levels;
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// The next statement can throw, but that's fine since we would like the caller
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// to be able to agreggate those failures and only report when it is critical or noteworthy.
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// one common reason for failure is because one of the nodes comes down and before this node
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// detects it the scan query done inside this call is failing.
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service_levels = _sl_data_accessor->get_service_levels().get();
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service_levels_info service_levels_for_add_or_update;
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service_levels_info service_levels_for_delete;
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auto current_it = _service_levels_db.begin();
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auto new_state_it = service_levels.begin();
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// we want to detect 3 kinds of objects in one pass -
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// 1. new service levels that have been added to the distributed keyspace
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// 2. existing service levels that have changed
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// 3. removed service levels
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// this loop is batching together add/update operation and remove operation
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// then they are all executed together.The reason for this is to allow for
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// firstly delete all that there is to be deleted and only then adding new
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// service levels.
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while (current_it != _service_levels_db.end() && new_state_it != service_levels.end()) {
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if (current_it->first.starts_with('$')) {
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sl_logger.warn("Service level names starting with '$' are reserved for internal tenants. Rename service level \"{}\" to drop '$' prefix.", current_it->first.c_str());
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}
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if (current_it->first == new_state_it->first) {
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//the service level exists on both the cureent and new state.
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if (current_it->second.slo != new_state_it->second) {
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// The service level configuration is different
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// in the new state and the old state, meaning it needs to be updated.
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service_levels_for_add_or_update.insert(*new_state_it);
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}
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current_it++;
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new_state_it++;
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} else if (current_it->first < new_state_it->first) {
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//The service level does not exists in the new state so it needs to be
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//removed, but only if it is not static since static configurations dont
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//come from the distributed keyspace but from code.
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if (!current_it->second.is_static) {
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sl_logger.info("service level \"{}\" was deleted.", current_it->first.c_str());
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service_levels_for_delete.emplace(current_it->first, current_it->second.slo);
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}
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current_it++;
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} else { /*new_it->first < current_it->first */
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// The service level exits in the new state but not in the old state
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// so it needs to be added.
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sl_logger.info("service level \"{}\" was added.", new_state_it->first.c_str());
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service_levels_for_add_or_update.insert(*new_state_it);
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new_state_it++;
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}
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}
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for (; current_it != _service_levels_db.end(); current_it++) {
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if (!current_it->second.is_static) {
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sl_logger.info("service level \"{}\" was deleted.", current_it->first.c_str());
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service_levels_for_delete.emplace(current_it->first, current_it->second.slo);
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}
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}
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for (; new_state_it != service_levels.end(); new_state_it++) {
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sl_logger.info("service level \"{}\" was added.", new_state_it->first.c_str());
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service_levels_for_add_or_update.emplace(new_state_it->first, new_state_it->second);
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}
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for (auto&& sl : service_levels_for_delete) {
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do_remove_service_level(sl.first, false).get();
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}
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for (auto&& sl : service_levels_for_add_or_update) {
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do_add_service_level(sl.first, sl.second).get();
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}
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});
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});
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}
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future<std::optional<service_level_options>> service_level_controller::find_service_level(auth::role_set roles, include_effective_names include_names) {
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auto& role_manager = _auth_service.local().underlying_role_manager();
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// converts a list of roles into the chosen service level.
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return ::map_reduce(roles.begin(), roles.end(), [&role_manager, include_names, this] (const sstring& role) {
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return role_manager.get_attribute(role, "service_level").then_wrapped([include_names, this, role] (future<std::optional<sstring>> sl_name_fut) -> std::optional<service_level_options> {
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try {
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std::optional<sstring> sl_name = sl_name_fut.get();
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if (!sl_name) {
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return std::nullopt;
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}
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auto sl_it = _service_levels_db.find(*sl_name);
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if ( sl_it == _service_levels_db.end()) {
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return std::nullopt;
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}
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if (include_names == include_effective_names::yes) {
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sl_it->second.slo.init_effective_names(*sl_name);
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}
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return sl_it->second.slo;
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} catch (...) { // when we fail, we act as if the attribute does not exist so the node
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// will not be brought down.
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return std::nullopt;
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}
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});
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}, std::optional<service_level_options>{}, [] (std::optional<service_level_options> first, std::optional<service_level_options> second) -> std::optional<service_level_options> {
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if (!second) {
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return first;
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} else if (!first) {
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return second;
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} else {
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return first->merge_with(*second);
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}
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});
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}
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future<> service_level_controller::notify_service_level_added(sstring name, service_level sl_data) {
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return seastar::async( [this, name, sl_data] {
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_subscribers.thread_for_each([name, sl_data] (qos_configuration_change_subscriber* subscriber) {
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try {
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subscriber->on_before_service_level_add(sl_data.slo, {name}).get();
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} catch (...) {
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sl_logger.error("notify_service_level_added: exception occurred in one of the observers callbacks {}", std::current_exception());
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}
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});
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_service_levels_db.emplace(name, sl_data);
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});
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}
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future<> service_level_controller::notify_service_level_updated(sstring name, service_level_options slo) {
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auto sl_it = _service_levels_db.find(name);
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future<> f = make_ready_future();
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if (sl_it != _service_levels_db.end()) {
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service_level_options slo_before = sl_it->second.slo;
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return seastar::async( [this,sl_it, name, slo_before, slo] {
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_subscribers.thread_for_each([name, slo_before, slo] (qos_configuration_change_subscriber* subscriber) {
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try {
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subscriber->on_before_service_level_change(slo_before, slo, {name}).get();
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} catch (...) {
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sl_logger.error("notify_service_level_updated: exception occurred in one of the observers callbacks {}", std::current_exception());
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}
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});
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sl_it->second.slo = slo;
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});
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}
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return f;
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}
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future<> service_level_controller::notify_service_level_removed(sstring name) {
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auto sl_it = _service_levels_db.find(name);
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if (sl_it != _service_levels_db.end()) {
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_service_levels_db.erase(sl_it);
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co_return co_await seastar::async( [this, name] {
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_subscribers.thread_for_each([name] (qos_configuration_change_subscriber* subscriber) {
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try {
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subscriber->on_after_service_level_remove({name}).get();
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} catch (...) {
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sl_logger.error("notify_service_level_removed: exception occurred in one of the observers callbacks {}", std::current_exception());
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}
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});
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});
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}
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co_return;
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}
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void service_level_controller::update_from_distributed_data(std::function<steady_clock_type::duration()> interval_f) {
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if (this_shard_id() != global_controller) {
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throw std::runtime_error(format("Service level updates from distributed data can only be activated on shard {}", global_controller));
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}
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if (_global_controller_db->distributed_data_update.available()) {
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sl_logger.info("update_from_distributed_data: starting configuration polling loop");
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_logged_intervals = 0;
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_global_controller_db->distributed_data_update = repeat([this, interval_f = std::move(interval_f)] {
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return sleep_abortable<steady_clock_type>(interval_f(),
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_global_controller_db->dist_data_update_aborter).then_wrapped([this] (future<>&& f) {
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try {
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f.get();
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return update_service_levels_from_distributed_data().then_wrapped([this] (future<>&& f){
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try {
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f.get();
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_last_successful_config_update = seastar::lowres_clock::now();
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_logged_intervals = 0;
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} catch (...) {
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using namespace std::literals::chrono_literals;
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constexpr auto age_resolution = 90s;
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constexpr unsigned error_threshold = 10; // Change the logging level to error after 10 age_resolution intervals.
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unsigned configuration_age = (seastar::lowres_clock::now() - _last_successful_config_update) / age_resolution;
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if (configuration_age > _logged_intervals) {
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log_level ll = configuration_age >= error_threshold ? log_level::error : log_level::warn;
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sl_logger.log(ll, "update_from_distributed_data: failed to update configuration for more than {} seconds : {}",
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(age_resolution*configuration_age).count(), std::current_exception());
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_logged_intervals++;
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}
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}
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return stop_iteration::no;
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});
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} catch (const sleep_aborted& e) {
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sl_logger.info("update_from_distributed_data: configuration polling loop aborted");
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return make_ready_future<seastar::bool_class<seastar::stop_iteration_tag>>(stop_iteration::yes);
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}
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});
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}).then_wrapped([] (future<>&& f) {
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try {
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f.get();
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} catch (...) {
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sl_logger.error("update_from_distributed_data: polling loop stopped unexpectedly by: {}",
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std::current_exception());
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}
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});
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}
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}
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future<> service_level_controller::add_distributed_service_level(sstring name, service_level_options slo, bool if_not_exists, std::optional<service::group0_guard> guard) {
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set_service_level_op_type add_type = if_not_exists ? set_service_level_op_type::add_if_not_exists : set_service_level_op_type::add;
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return set_distributed_service_level(name, slo, add_type, std::move(guard));
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}
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future<> service_level_controller::alter_distributed_service_level(sstring name, service_level_options slo, std::optional<service::group0_guard> guard) {
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return set_distributed_service_level(name, slo, set_service_level_op_type::alter, std::move(guard));
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}
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future<> service_level_controller::drop_distributed_service_level(sstring name, bool if_exists, std::optional<service::group0_guard> guard) {
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auto sl_info = co_await _sl_data_accessor->get_service_levels();
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auto it = sl_info.find(name);
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if (it == sl_info.end()) {
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if (if_exists) {
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co_return;
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} else {
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throw nonexistant_service_level_exception(name);
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}
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}
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auto& role_manager = _auth_service.local().underlying_role_manager();
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auto attributes = co_await role_manager.query_attribute_for_all("service_level");
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//FIXME: use the same group0 operation to remove attribute
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if (guard) {
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service::release_guard(std::move(*guard));
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guard = std::nullopt;
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}
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co_await coroutine::parallel_for_each(attributes.begin(), attributes.end(), [&role_manager, name] (auto&& attr) {
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if (attr.second == name) {
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return do_with(attr.first, [&role_manager] (const sstring& role_name) {
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return role_manager.remove_attribute(role_name, "service_level");
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});
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} else {
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return make_ready_future();
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}
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});
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co_return co_await _sl_data_accessor->drop_service_level(name, std::move(guard), _global_controller_db->group0_aborter);
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}
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future<service_levels_info> service_level_controller::get_distributed_service_levels() {
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return _sl_data_accessor ? _sl_data_accessor->get_service_levels() : make_ready_future<service_levels_info>();
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}
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future<service_levels_info> service_level_controller::get_distributed_service_level(sstring service_level_name) {
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return _sl_data_accessor ? _sl_data_accessor->get_service_level(service_level_name) : make_ready_future<service_levels_info>();
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}
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future<> service_level_controller::set_distributed_service_level(sstring name, service_level_options slo, set_service_level_op_type op_type, std::optional<service::group0_guard> guard) {
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auto sl_info = co_await _sl_data_accessor->get_service_levels();
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auto it = sl_info.find(name);
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// test for illegal requests or requests that should terminate without any action
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if (it == sl_info.end()) {
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if (op_type == set_service_level_op_type::alter) {
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throw exceptions::invalid_request_exception(format("The service level '{}' doesn't exist.", name));
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}
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} else {
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if (op_type == set_service_level_op_type::add) {
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throw exceptions::invalid_request_exception(format("The service level '{}' already exists.", name));
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} else if (op_type == set_service_level_op_type::add_if_not_exists) {
|
|
co_return;
|
|
}
|
|
}
|
|
co_return co_await _sl_data_accessor->set_service_level(name, slo, std::move(guard), _global_controller_db->group0_aborter);
|
|
}
|
|
|
|
future<> service_level_controller::do_add_service_level(sstring name, service_level_options slo, bool is_static) {
|
|
auto service_level_it = _service_levels_db.find(name);
|
|
if (is_static) {
|
|
_global_controller_db->static_configurations[name] = slo;
|
|
}
|
|
if (service_level_it != _service_levels_db.end()) {
|
|
if ((is_static && service_level_it->second.is_static) || !is_static) {
|
|
if ((service_level_it->second.is_static) && (!is_static)) {
|
|
service_level_it->second.is_static = false;
|
|
}
|
|
return container().invoke_on_all(&service_level_controller::notify_service_level_updated, name, slo);
|
|
} else {
|
|
// this means we set static layer when the the service level
|
|
// is running of the non static configuration. so we have nothing
|
|
// else to do since we already saved the static configuration.
|
|
return make_ready_future();
|
|
}
|
|
} else {
|
|
return do_with(service_level{.slo = slo, .is_static = is_static}, std::move(name), [this] (service_level& sl, sstring& name) {
|
|
return container().invoke_on_all(&service_level_controller::notify_service_level_added, name, sl);
|
|
});
|
|
}
|
|
return make_ready_future();
|
|
}
|
|
|
|
bool service_level_controller::is_v2() const {
|
|
return _sl_data_accessor && _sl_data_accessor->is_v2();
|
|
}
|
|
|
|
void service_level_controller::upgrade_to_v2(cql3::query_processor& qp, service::raft_group0_client& group0_client) {
|
|
if (!_sl_data_accessor) {
|
|
return;
|
|
}
|
|
|
|
auto v2_data_accessor = _sl_data_accessor->upgrade_to_v2(qp, group0_client);
|
|
if (v2_data_accessor) {
|
|
_sl_data_accessor = v2_data_accessor;
|
|
}
|
|
}
|
|
|
|
future<> service_level_controller::migrate_to_v2(size_t nodes_count, db::system_keyspace& sys_ks, cql3::query_processor& qp, service::raft_group0_client& group0_client, abort_source& as) {
|
|
//TODO:
|
|
//Now we trust the administrator to not make changes to service levels during the migration.
|
|
//Ideally, during the migration we should set migration data accessor(on all nodes, on all shards) that allows to read but forbids writes
|
|
using namespace std::chrono_literals;
|
|
|
|
auto schema = qp.db().find_schema(db::system_distributed_keyspace::NAME, db::system_distributed_keyspace::SERVICE_LEVELS);
|
|
|
|
const auto t = 5min;
|
|
const timeout_config tc{t, t, t, t, t, t, t};
|
|
service::client_state cs(::service::client_state::internal_tag{}, tc);
|
|
service::query_state qs(cs, empty_service_permit());
|
|
|
|
// `system_distributed` keyspace has RF=3 and we need to scan it with CL=ALL
|
|
// To support migration on cluster with 1 or 2 nodes, set appropriate CL
|
|
auto cl = db::consistency_level::ALL;
|
|
if (nodes_count == 1) {
|
|
cl = db::consistency_level::ONE;
|
|
} else if (nodes_count == 2) {
|
|
cl = db::consistency_level::TWO;
|
|
}
|
|
|
|
auto rows = co_await qp.execute_internal(
|
|
format("SELECT * FROM {}.{}", db::system_distributed_keyspace::NAME, db::system_distributed_keyspace::SERVICE_LEVELS),
|
|
cl,
|
|
qs,
|
|
{},
|
|
cql3::query_processor::cache_internal::no);
|
|
if (rows->empty()) {
|
|
co_return;
|
|
}
|
|
|
|
|
|
auto col_names = boost::copy_range<std::vector<sstring>>(schema->all_columns() | boost::adaptors::transformed([] (const auto& col) {return col.name_as_cql_string(); }));
|
|
auto col_names_str = boost::algorithm::join(col_names, ", ");
|
|
sstring val_binders_str = "?";
|
|
for (size_t i = 1; i < col_names.size(); ++i) {
|
|
val_binders_str += ", ?";
|
|
}
|
|
|
|
auto guard = co_await group0_client.start_operation(as);
|
|
|
|
std::vector<mutation> migration_muts;
|
|
for (const auto& row: *rows) {
|
|
std::vector<data_value_or_unset> values;
|
|
for (const auto& col: schema->all_columns()) {
|
|
if (row.has(col.name_as_text())) {
|
|
values.push_back(col.type->deserialize(row.get_blob(col.name_as_text())));
|
|
} else {
|
|
values.push_back(unset_value{});
|
|
}
|
|
}
|
|
|
|
auto muts = co_await qp.get_mutations_internal(
|
|
format("INSERT INTO {}.{} ({}) VALUES ({})",
|
|
db::system_keyspace::NAME,
|
|
db::system_keyspace::SERVICE_LEVELS_V2,
|
|
col_names_str,
|
|
val_binders_str),
|
|
qos_query_state(),
|
|
guard.write_timestamp(),
|
|
std::move(values));
|
|
if (muts.size() != 1) {
|
|
on_internal_error(sl_logger, format("expecting single insert mutation, got {}", muts.size()));
|
|
}
|
|
migration_muts.push_back(std::move(muts[0]));
|
|
}
|
|
|
|
auto status_mut = co_await sys_ks.make_service_levels_version_mutation(2, guard);
|
|
migration_muts.push_back(std::move(status_mut));
|
|
|
|
service::write_mutations change {
|
|
.mutations{migration_muts.begin(), migration_muts.end()},
|
|
};
|
|
auto group0_cmd = group0_client.prepare_command(change, guard, "migrate service levels to v2");
|
|
co_await group0_client.add_entry(std::move(group0_cmd), std::move(guard), as);
|
|
}
|
|
|
|
future<> service_level_controller::do_remove_service_level(sstring name, bool remove_static) {
|
|
auto service_level_it = _service_levels_db.find(name);
|
|
if (service_level_it != _service_levels_db.end()) {
|
|
auto static_conf_it = _global_controller_db->static_configurations.end();
|
|
bool static_exists = false;
|
|
if (remove_static) {
|
|
_global_controller_db->static_configurations.erase(name);
|
|
} else {
|
|
static_conf_it = _global_controller_db->static_configurations.find(name);
|
|
static_exists = static_conf_it != _global_controller_db->static_configurations.end();
|
|
}
|
|
if (remove_static && service_level_it->second.is_static) {
|
|
return container().invoke_on_all(&service_level_controller::notify_service_level_removed, name);
|
|
} else if (!remove_static && !service_level_it->second.is_static) {
|
|
if (static_exists) {
|
|
service_level_it->second.is_static = true;
|
|
return container().invoke_on_all(&service_level_controller::notify_service_level_updated, name, static_conf_it->second);
|
|
} else {
|
|
return container().invoke_on_all(&service_level_controller::notify_service_level_removed, name);
|
|
}
|
|
}
|
|
}
|
|
return make_ready_future();
|
|
}
|
|
|
|
void service_level_controller::on_join_cluster(const gms::inet_address& endpoint) { }
|
|
|
|
void service_level_controller::on_leave_cluster(const gms::inet_address& endpoint, const locator::host_id& hid) {
|
|
if (this_shard_id() == global_controller && _token_metadata.get()->get_topology().is_me(endpoint)) {
|
|
_global_controller_db->dist_data_update_aborter.request_abort();
|
|
_global_controller_db->group0_aborter.request_abort();
|
|
}
|
|
}
|
|
|
|
void service_level_controller::on_up(const gms::inet_address& endpoint) { }
|
|
|
|
void service_level_controller::on_down(const gms::inet_address& endpoint) { }
|
|
|
|
void service_level_controller::register_subscriber(qos_configuration_change_subscriber* subscriber) {
|
|
_subscribers.add(subscriber);
|
|
}
|
|
|
|
future<> service_level_controller::unregister_subscriber(qos_configuration_change_subscriber* subscriber) {
|
|
return _subscribers.remove(subscriber);
|
|
}
|
|
|
|
future<shared_ptr<service_level_controller::service_level_distributed_data_accessor>>
|
|
get_service_level_distributed_data_accessor_for_current_version(
|
|
db::system_keyspace& sys_ks,
|
|
db::system_distributed_keyspace& sys_dist_ks,
|
|
cql3::query_processor& qp, service::raft_group0_client& group0_client
|
|
) {
|
|
auto sl_version = co_await sys_ks.get_service_levels_version();
|
|
|
|
if (sl_version && *sl_version == 2) {
|
|
co_return static_pointer_cast<qos::service_level_controller::service_level_distributed_data_accessor>(
|
|
make_shared<qos::raft_service_level_distributed_data_accessor>(qp, group0_client));
|
|
} else {
|
|
co_return static_pointer_cast<qos::service_level_controller::service_level_distributed_data_accessor>(
|
|
make_shared<qos::standard_service_level_distributed_data_accessor>(sys_dist_ks));
|
|
}
|
|
}
|
|
|
|
}
|