mirror of
https://github.com/scylladb/scylladb.git
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fdfa6703c3
" The original motivation for the "utils: introduce a loading_shared_values" series was a hinted handoff work where I needed an on-demand asynchronously loading key-value container (a replica address to a commitlog instance map). It turned out that we already have the classes that do almost what I needed: - utils::loading_cache - sstables::shared_index_lists Therefore it made sense to find a common ground, unify this functionality and reuse the code both in the classes above and in the new hinted handoff code. This series introduces the utils::loading_shared_values that generalizes the sstables::shared_index_lists API on top of bi::unordered_set with the rehashing logic from the utils::loading_cache triggered by an addition of an entry to the set (PATCH1). Then it reworks the sstables::shared_index_lists and utils::loading_cache on top of the new class (PATCH2 and PATCH3). PATCH4 optimizes the loading_cache for the long timer period use case. But then we have discovered that we have another "customer" for the loading_cache. Apparently our prepared statements cache had a birth flaw - it was unlimited in size - unless the corresponding keyspace and/or table are modified/dropped the entries are never evicted. We clearly need to limit its size and it would also make sense to evict the cache entries that haven't been used long enough. This seems like a perfect match for a utils::loading_cache except for prepared statements don't need to be reloaded after they are created. Patches starting from PATCH5 are dealing with adding the utils::loading_cache the missing functionality (like making the "reloading" conditional and adding the synchronous methods like find(key)) and then transitioning the CQL and Thrift prepared statements caches to utils::loading_cache. This also fixes #2474." * 'evict_unused_prepared-v5' of https://github.com/vladzcloudius/scylla: tests: loading_cache_test: initial commit cql3::query_processor: implement CQL and Thrift prepared statements caches using cql3::prepared_statements_cache cql3: prepared statements cache on top of loading_cache utils::loading_cache: make the size limitation more strict utils::loading_cache: added static_asserts for checking the callbacks signatures utils::loading_cache: add a bunch of standard synchronous methods utils::loading_cache: add the ability to create a cache that would not reload the values utils::loading_cache: add the ability to work with not-copy-constructable values utils::loading_cache: add EntrySize template parameter utils::loading_cache: rework on top of utils::loading_shared_values sstables::shared_index_list: use utils::loading_shared_values utils: introduce loading_shared_values
601 lines
24 KiB
C++
601 lines
24 KiB
C++
/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*
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* Copyright (C) 2015 ScyllaDB
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*
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* Modified by ScyllaDB
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*/
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/*
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* This file is part of Scylla.
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*
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* Scylla is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Scylla is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Scylla. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <seastar/core/metrics.hh>
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#include "cql3/query_processor.hh"
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#include "cql3/CqlParser.hpp"
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#include "cql3/error_collector.hh"
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#include "cql3/statements/batch_statement.hh"
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#include "cql3/util.hh"
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#include "untyped_result_set.hh"
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#include "transport/messages/result_message.hh"
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#define CRYPTOPP_ENABLE_NAMESPACE_WEAK 1
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#include <cryptopp/md5.h>
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namespace cql3 {
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using namespace statements;
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using namespace cql_transport::messages;
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logging::logger log("query_processor");
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logging::logger prep_cache_log("prepared_statements_cache");
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distributed<query_processor> _the_query_processor;
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const sstring query_processor::CQL_VERSION = "3.3.1";
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const std::chrono::minutes prepared_statements_cache::entry_expiry = std::chrono::minutes(60);
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class query_processor::internal_state {
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service::query_state _qs;
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public:
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internal_state()
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: _qs(service::client_state{service::client_state::internal_tag()})
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{ }
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operator service::query_state&() {
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return _qs;
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}
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operator const service::query_state&() const {
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return _qs;
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}
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operator service::client_state&() {
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return _qs.get_client_state();
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}
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operator const service::client_state&() const {
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return _qs.get_client_state();
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}
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api::timestamp_type next_timestamp() {
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return _qs.get_client_state().get_timestamp();
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}
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};
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api::timestamp_type query_processor::next_timestamp() {
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return _internal_state->next_timestamp();
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}
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query_processor::query_processor(distributed<service::storage_proxy>& proxy,
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distributed<database>& db)
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: _migration_subscriber{std::make_unique<migration_subscriber>(this)}
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, _proxy(proxy)
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, _db(db)
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, _internal_state(new internal_state())
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, _prepared_cache(prep_cache_log)
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{
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namespace sm = seastar::metrics;
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_metrics.add_group("query_processor", {
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sm::make_derive("statements_prepared", _stats.prepare_invocations,
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sm::description("Counts a total number of parsed CQL requests.")),
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});
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_metrics.add_group("cql", {
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sm::make_derive("reads", _cql_stats.reads,
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sm::description("Counts a total number of CQL read requests.")),
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sm::make_derive("inserts", _cql_stats.inserts,
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sm::description("Counts a total number of CQL INSERT requests.")),
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sm::make_derive("updates", _cql_stats.updates,
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sm::description("Counts a total number of CQL UPDATE requests.")),
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sm::make_derive("deletes", _cql_stats.deletes,
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sm::description("Counts a total number of CQL DELETE requests.")),
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sm::make_derive("batches", _cql_stats.batches,
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sm::description("Counts a total number of CQL BATCH requests.")),
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sm::make_derive("statements_in_batches", _cql_stats.statements_in_batches,
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sm::description("Counts a total number of sub-statements in CQL BATCH requests.")),
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sm::make_derive("batches_pure_logged", _cql_stats.batches_pure_logged,
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sm::description("Counts a total number of LOGGED batches that were executed as LOGGED batches.")),
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sm::make_derive("batches_pure_unlogged", _cql_stats.batches_pure_unlogged,
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sm::description("Counts a total number of UNLOGGED batches that were executed as UNLOGGED batches.")),
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sm::make_derive("batches_unlogged_from_logged", _cql_stats.batches_unlogged_from_logged,
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sm::description("Counts a total number of LOGGED batches that were executed as UNLOGGED batches.")),
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sm::make_derive("prepared_cache_evictions", [] { return prepared_statements_cache::shard_stats().prepared_cache_evictions; },
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sm::description("Counts a number of prepared statements cache entries evictions.")),
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sm::make_gauge("prepared_cache_size", [this] { return _prepared_cache.size(); },
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sm::description("A number of entries in the prepared statements cache.")),
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sm::make_gauge("prepared_cache_memory_footprint", [this] { return _prepared_cache.memory_footprint(); },
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sm::description("Size (in bytes) of the prepared statements cache.")),
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});
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service::get_local_migration_manager().register_listener(_migration_subscriber.get());
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}
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query_processor::~query_processor()
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{}
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future<> query_processor::stop()
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{
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service::get_local_migration_manager().unregister_listener(_migration_subscriber.get());
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return make_ready_future<>();
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}
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future<::shared_ptr<result_message>>
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query_processor::process(const sstring_view& query_string, service::query_state& query_state, query_options& options)
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{
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log.trace("process: \"{}\"", query_string);
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tracing::trace(query_state.get_trace_state(), "Parsing a statement");
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auto p = get_statement(query_string, query_state.get_client_state());
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options.prepare(p->bound_names);
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auto cql_statement = p->statement;
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if (cql_statement->get_bound_terms() != options.get_values_count()) {
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throw exceptions::invalid_request_exception("Invalid amount of bind variables");
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}
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warn(unimplemented::cause::METRICS);
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#if 0
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if (!queryState.getClientState().isInternal)
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metrics.regularStatementsExecuted.inc();
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#endif
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tracing::trace(query_state.get_trace_state(), "Processing a statement");
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return process_statement(std::move(cql_statement), query_state, options);
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}
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future<::shared_ptr<result_message>>
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query_processor::process_statement(::shared_ptr<cql_statement> statement,
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service::query_state& query_state,
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const query_options& options)
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{
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#if 0
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logger.trace("Process {} @CL.{}", statement, options.getConsistency());
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#endif
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return statement->check_access(query_state.get_client_state()).then([this, statement, &query_state, &options]() {
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auto& client_state = query_state.get_client_state();
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statement->validate(_proxy, client_state);
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auto fut = make_ready_future<::shared_ptr<cql_transport::messages::result_message>>();
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if (client_state.is_internal()) {
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fut = statement->execute_internal(_proxy, query_state, options);
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} else {
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fut = statement->execute(_proxy, query_state, options);
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}
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return fut.then([statement] (auto msg) {
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if (msg) {
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return make_ready_future<::shared_ptr<result_message>>(std::move(msg));
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}
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return make_ready_future<::shared_ptr<result_message>>(
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::make_shared<result_message::void_message>());
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});
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});
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}
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future<::shared_ptr<cql_transport::messages::result_message::prepared>>
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query_processor::prepare(sstring query_string, service::query_state& query_state)
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{
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auto& client_state = query_state.get_client_state();
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return prepare(std::move(query_string), client_state, client_state.is_thrift());
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}
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future<::shared_ptr<cql_transport::messages::result_message::prepared>>
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query_processor::prepare(sstring query_string, const service::client_state& client_state, bool for_thrift)
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{
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using namespace cql_transport::messages;
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if (for_thrift) {
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return prepare_one<result_message::prepared::thrift>(std::move(query_string), client_state, compute_thrift_id, prepared_cache_key_type::thrift_id);
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} else {
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return prepare_one<result_message::prepared::cql>(std::move(query_string), client_state, compute_id, prepared_cache_key_type::cql_id);
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}
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}
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::shared_ptr<cql_transport::messages::result_message::prepared>
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query_processor::get_stored_prepared_statement(const std::experimental::string_view& query_string,
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const sstring& keyspace,
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bool for_thrift)
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{
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using namespace cql_transport::messages;
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if (for_thrift) {
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return get_stored_prepared_statement_one<result_message::prepared::thrift>(query_string, keyspace, compute_thrift_id, prepared_cache_key_type::thrift_id);
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} else {
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return get_stored_prepared_statement_one<result_message::prepared::cql>(query_string, keyspace, compute_id, prepared_cache_key_type::cql_id);
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}
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}
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static bytes md5_calculate(const std::experimental::string_view& s)
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{
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constexpr size_t size = CryptoPP::Weak1::MD5::DIGESTSIZE;
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CryptoPP::Weak::MD5 hash;
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unsigned char digest[size];
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hash.CalculateDigest(digest, reinterpret_cast<const unsigned char*>(s.data()), s.size());
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return std::move(bytes{reinterpret_cast<const int8_t*>(digest), size});
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}
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static sstring hash_target(const std::experimental::string_view& query_string, const sstring& keyspace) {
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return keyspace + query_string.to_string();
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}
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prepared_cache_key_type query_processor::compute_id(const std::experimental::string_view& query_string, const sstring& keyspace)
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{
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return prepared_cache_key_type(md5_calculate(hash_target(query_string, keyspace)));
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}
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prepared_cache_key_type query_processor::compute_thrift_id(const std::experimental::string_view& query_string, const sstring& keyspace)
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{
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auto target = hash_target(query_string, keyspace);
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uint32_t h = 0;
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for (auto&& c : hash_target(query_string, keyspace)) {
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h = 31*h + c;
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}
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return prepared_cache_key_type(static_cast<int32_t>(h));
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}
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std::unique_ptr<prepared_statement>
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query_processor::get_statement(const sstring_view& query, const service::client_state& client_state)
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{
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#if 0
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Tracing.trace("Parsing {}", queryStr);
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#endif
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::shared_ptr<raw::parsed_statement> statement = parse_statement(query);
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// Set keyspace for statement that require login
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auto cf_stmt = dynamic_pointer_cast<raw::cf_statement>(statement);
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if (cf_stmt) {
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cf_stmt->prepare_keyspace(client_state);
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}
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#if 0
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Tracing.trace("Preparing statement");
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#endif
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++_stats.prepare_invocations;
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return statement->prepare(_db.local(), _cql_stats);
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}
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::shared_ptr<raw::parsed_statement>
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query_processor::parse_statement(const sstring_view& query)
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{
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try {
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auto statement = util::do_with_parser(query, std::mem_fn(&cql3_parser::CqlParser::query));
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if (!statement) {
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throw exceptions::syntax_exception("Parsing failed");
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}
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return statement;
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} catch (const exceptions::recognition_exception& e) {
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throw exceptions::syntax_exception(sprint("Invalid or malformed CQL query string: %s", e.what()));
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} catch (const exceptions::cassandra_exception& e) {
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throw;
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} catch (const std::exception& e) {
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log.error("The statement: {} could not be parsed: {}", query, e.what());
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throw exceptions::syntax_exception(sprint("Failed parsing statement: [%s] reason: %s", query, e.what()));
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}
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}
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query_options query_processor::make_internal_options(const statements::prepared_statement::checked_weak_ptr& p,
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const std::initializer_list<data_value>& values,
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db::consistency_level cl,
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int32_t page_size)
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{
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if (p->bound_names.size() != values.size()) {
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throw std::invalid_argument(sprint("Invalid number of values. Expecting %d but got %d", p->bound_names.size(), values.size()));
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}
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auto ni = p->bound_names.begin();
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std::vector<cql3::raw_value> bound_values;
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for (auto& v : values) {
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auto& n = *ni++;
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if (v.type() == bytes_type) {
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bound_values.push_back(cql3::raw_value::make_value(value_cast<bytes>(v)));
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} else if (v.is_null()) {
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bound_values.push_back(cql3::raw_value::make_null());
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} else {
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bound_values.push_back(cql3::raw_value::make_value(n->type->decompose(v)));
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}
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}
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if (page_size > 0) {
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::shared_ptr<service::pager::paging_state> paging_state;
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db::consistency_level serial_consistency = db::consistency_level::SERIAL;
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api::timestamp_type ts = api::missing_timestamp;
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return query_options(cl, bound_values, cql3::query_options::specific_options{page_size, std::move(paging_state), serial_consistency, ts});
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}
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return query_options(cl, bound_values);
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}
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statements::prepared_statement::checked_weak_ptr query_processor::prepare_internal(const sstring& query_string)
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{
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auto& p = _internal_statements[query_string];
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if (p == nullptr) {
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auto np = parse_statement(query_string)->prepare(_db.local(), _cql_stats);
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np->statement->validate(_proxy, *_internal_state);
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p = std::move(np); // inserts it into map
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}
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return p->checked_weak_from_this();
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}
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future<::shared_ptr<untyped_result_set>>
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query_processor::execute_internal(const sstring& query_string,
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const std::initializer_list<data_value>& values)
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{
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if (log.is_enabled(logging::log_level::trace)) {
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log.trace("execute_internal: \"{}\" ({})", query_string, ::join(", ", values));
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}
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return execute_internal(prepare_internal(query_string), values);
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}
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struct internal_query_state {
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sstring query_string;
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std::unique_ptr<query_options> opts;
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statements::prepared_statement::checked_weak_ptr p;
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bool more_results = true;
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};
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::shared_ptr<internal_query_state> query_processor::create_paged_state(const sstring& query_string,
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const std::initializer_list<data_value>& values, int32_t page_size) {
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auto p = prepare_internal(query_string);
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auto opts = make_internal_options(p, values, db::consistency_level::ONE, page_size);
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::shared_ptr<internal_query_state> res = ::make_shared<internal_query_state>(internal_query_state{query_string, std::make_unique<cql3::query_options>(std::move(opts)), std::move(p), true});
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return res;
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}
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bool query_processor::has_more_results(::shared_ptr<cql3::internal_query_state> state) const {
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if (state) {
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return state->more_results;
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}
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return false;
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}
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future<> query_processor::for_each_cql_result(::shared_ptr<cql3::internal_query_state> state,
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std::function<stop_iteration(const cql3::untyped_result_set::row&)>&& f) {
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return do_with(seastar::shared_ptr<bool>(), [f, this, state](auto& is_done) mutable {
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is_done = seastar::make_shared<bool>(false);
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auto stop_when = [is_done]() {
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return *is_done;
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};
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auto do_resuls = [is_done, state, f, this]() mutable {
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return this->execute_paged_internal(state).then([is_done, state, f, this](::shared_ptr<cql3::untyped_result_set> msg) mutable {
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if (msg->empty()) {
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*is_done = true;
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} else {
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if (!this->has_more_results(state)) {
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*is_done = true;
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}
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for (auto& row : *msg) {
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if (f(row) == stop_iteration::yes) {
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*is_done = true;
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break;
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}
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}
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}
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});
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};
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return do_until(stop_when, do_resuls);
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});
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}
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future<::shared_ptr<untyped_result_set>> query_processor::execute_paged_internal(::shared_ptr<internal_query_state> state) {
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return state->p->statement->execute_internal(_proxy, *_internal_state, *state->opts).then(
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[state, this](::shared_ptr<cql_transport::messages::result_message> msg) mutable {
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class visitor : public result_message::visitor_base {
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::shared_ptr<internal_query_state> _state;
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query_processor& _qp;
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public:
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visitor(::shared_ptr<internal_query_state> state, query_processor& qp) : _state(state), _qp(qp) {
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}
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virtual ~visitor() = default;
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void visit(const result_message::rows& rmrs) override {
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auto& rs = rmrs.rs();
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|
if (rs.get_metadata().paging_state()) {
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|
bool done = !rs.get_metadata().flags().contains<cql3::metadata::flag::HAS_MORE_PAGES>();
|
|
|
|
if (done) {
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_state->more_results = false;
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} else {
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|
const service::pager::paging_state& st = *rs.get_metadata().paging_state();
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shared_ptr<service::pager::paging_state> shrd = ::make_shared<service::pager::paging_state>(st);
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_state->opts = std::make_unique<query_options>(std::move(_state->opts), shrd);
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_state->p = _qp.prepare_internal(_state->query_string);
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}
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|
} else {
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_state->more_results = false;
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}
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|
}
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|
};
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|
visitor v(state, *this);
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if (msg != nullptr) {
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|
msg->accept(v);
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|
}
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|
return make_ready_future<::shared_ptr<untyped_result_set>>(::make_shared<untyped_result_set>(msg));
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|
});
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|
}
|
|
|
|
future<::shared_ptr<untyped_result_set>>
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|
query_processor::execute_internal(statements::prepared_statement::checked_weak_ptr p,
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|
const std::initializer_list<data_value>& values)
|
|
{
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|
query_options opts = make_internal_options(p, values);
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|
return do_with(std::move(opts), [this, p = std::move(p)](auto& opts) {
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|
return p->statement->execute_internal(_proxy, *_internal_state, opts).then([&opts, stmt = p->statement](auto msg) {
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|
return make_ready_future<::shared_ptr<untyped_result_set>>(::make_shared<untyped_result_set>(msg));
|
|
});
|
|
});
|
|
}
|
|
|
|
future<::shared_ptr<untyped_result_set>>
|
|
query_processor::process(const sstring& query_string,
|
|
db::consistency_level cl,
|
|
const std::initializer_list<data_value>& values,
|
|
bool cache)
|
|
{
|
|
if (cache) {
|
|
return process(prepare_internal(query_string), cl, values);
|
|
} else {
|
|
auto p = parse_statement(query_string)->prepare(_db.local(), _cql_stats);
|
|
p->statement->validate(_proxy, *_internal_state);
|
|
auto checked_weak_ptr = p->checked_weak_from_this();
|
|
return process(std::move(checked_weak_ptr), cl, values).finally([p = std::move(p)] {});
|
|
}
|
|
}
|
|
|
|
future<::shared_ptr<untyped_result_set>>
|
|
query_processor::process(statements::prepared_statement::checked_weak_ptr p,
|
|
db::consistency_level cl,
|
|
const std::initializer_list<data_value>& values)
|
|
{
|
|
auto opts = make_internal_options(p, values, cl);
|
|
return do_with(std::move(opts), [this, p = std::move(p)](auto & opts) {
|
|
return p->statement->execute(_proxy, *_internal_state, opts).then([](auto msg) {
|
|
return make_ready_future<::shared_ptr<untyped_result_set>>(::make_shared<untyped_result_set>(msg));
|
|
});
|
|
});
|
|
}
|
|
|
|
future<::shared_ptr<cql_transport::messages::result_message>>
|
|
query_processor::process_batch(::shared_ptr<statements::batch_statement> batch,
|
|
service::query_state& query_state,
|
|
query_options& options)
|
|
{
|
|
return batch->check_access(query_state.get_client_state()).then([this, &query_state, &options, batch] {
|
|
batch->validate();
|
|
batch->validate(_proxy, query_state.get_client_state());
|
|
return batch->execute(_proxy, query_state, options);
|
|
});
|
|
}
|
|
|
|
query_processor::migration_subscriber::migration_subscriber(query_processor* qp)
|
|
: _qp{qp}
|
|
{
|
|
}
|
|
|
|
void query_processor::migration_subscriber::on_create_keyspace(const sstring& ks_name)
|
|
{
|
|
}
|
|
|
|
void query_processor::migration_subscriber::on_create_column_family(const sstring& ks_name, const sstring& cf_name)
|
|
{
|
|
}
|
|
|
|
void query_processor::migration_subscriber::on_create_user_type(const sstring& ks_name, const sstring& type_name)
|
|
{
|
|
}
|
|
|
|
void query_processor::migration_subscriber::on_create_function(const sstring& ks_name, const sstring& function_name)
|
|
{
|
|
log.warn("{} event ignored", __func__);
|
|
}
|
|
|
|
void query_processor::migration_subscriber::on_create_aggregate(const sstring& ks_name, const sstring& aggregate_name)
|
|
{
|
|
log.warn("{} event ignored", __func__);
|
|
}
|
|
|
|
void query_processor::migration_subscriber::on_create_view(const sstring& ks_name, const sstring& view_name)
|
|
{
|
|
}
|
|
|
|
void query_processor::migration_subscriber::on_update_keyspace(const sstring& ks_name)
|
|
{
|
|
}
|
|
|
|
void query_processor::migration_subscriber::on_update_column_family(const sstring& ks_name, const sstring& cf_name, bool columns_changed)
|
|
{
|
|
// #1255: Ignoring columns_changed deliberately.
|
|
log.info("Column definitions for {}.{} changed, invalidating related prepared statements", ks_name, cf_name);
|
|
remove_invalid_prepared_statements(ks_name, cf_name);
|
|
}
|
|
|
|
void query_processor::migration_subscriber::on_update_user_type(const sstring& ks_name, const sstring& type_name)
|
|
{
|
|
}
|
|
|
|
void query_processor::migration_subscriber::on_update_function(const sstring& ks_name, const sstring& function_name)
|
|
{
|
|
}
|
|
|
|
void query_processor::migration_subscriber::on_update_aggregate(const sstring& ks_name, const sstring& aggregate_name)
|
|
{
|
|
}
|
|
|
|
void query_processor::migration_subscriber::on_update_view(const sstring& ks_name, const sstring& view_name, bool columns_changed)
|
|
{
|
|
}
|
|
|
|
void query_processor::migration_subscriber::on_drop_keyspace(const sstring& ks_name)
|
|
{
|
|
remove_invalid_prepared_statements(ks_name, std::experimental::nullopt);
|
|
}
|
|
|
|
void query_processor::migration_subscriber::on_drop_column_family(const sstring& ks_name, const sstring& cf_name)
|
|
{
|
|
remove_invalid_prepared_statements(ks_name, cf_name);
|
|
}
|
|
|
|
void query_processor::migration_subscriber::on_drop_user_type(const sstring& ks_name, const sstring& type_name)
|
|
{
|
|
}
|
|
|
|
void query_processor::migration_subscriber::on_drop_function(const sstring& ks_name, const sstring& function_name)
|
|
{
|
|
log.warn("{} event ignored", __func__);
|
|
}
|
|
|
|
void query_processor::migration_subscriber::on_drop_aggregate(const sstring& ks_name, const sstring& aggregate_name)
|
|
{
|
|
log.warn("{} event ignored", __func__);
|
|
}
|
|
|
|
void query_processor::migration_subscriber::on_drop_view(const sstring& ks_name, const sstring& view_name)
|
|
{
|
|
}
|
|
|
|
void query_processor::migration_subscriber::remove_invalid_prepared_statements(sstring ks_name, std::experimental::optional<sstring> cf_name)
|
|
{
|
|
_qp->_prepared_cache.remove_if([&] (::shared_ptr<cql_statement> stmt) {
|
|
return this->should_invalidate(ks_name, cf_name, stmt);
|
|
});
|
|
}
|
|
|
|
bool query_processor::migration_subscriber::should_invalidate(sstring ks_name, std::experimental::optional<sstring> cf_name, ::shared_ptr<cql_statement> statement)
|
|
{
|
|
return statement->depends_on_keyspace(ks_name) && (!cf_name || statement->depends_on_column_family(*cf_name));
|
|
}
|
|
|
|
}
|