00de63c920
syntactical sugar + "process" for internal, similar to execute_internal, but allowing querying the whole cluster, and optional statement caching.
526 lines
22 KiB
C++
526 lines
22 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 2015 Cloudius Systems
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*
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* Modified by Cloudius Systems
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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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#pragma once
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#include <experimental/string_view>
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#include <unordered_map>
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#include "core/shared_ptr.hh"
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#include "exceptions/exceptions.hh"
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#include "cql3/query_options.hh"
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#include "cql3/statements/cf_statement.hh"
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#include "service/migration_manager.hh"
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#include "service/query_state.hh"
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#include "log.hh"
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#include "core/distributed.hh"
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#include "transport/messages/result_message.hh"
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#include "untyped_result_set.hh"
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namespace cql3 {
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namespace statements {
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class batch_statement;
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}
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class query_processor {
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public:
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class migration_subscriber;
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private:
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std::unique_ptr<migration_subscriber> _migration_subscriber;
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distributed<service::storage_proxy>& _proxy;
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distributed<database>& _db;
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class internal_state;
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std::unique_ptr<internal_state> _internal_state;
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public:
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query_processor(distributed<service::storage_proxy>& proxy, distributed<database>& db);
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~query_processor();
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static const sstring CQL_VERSION;
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distributed<database>& db() {
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return _db;
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}
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distributed<service::storage_proxy>& proxy() {
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return _proxy;
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}
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#if 0
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public static final QueryProcessor instance = new QueryProcessor();
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#endif
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private:
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#if 0
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private static final Logger logger = LoggerFactory.getLogger(QueryProcessor.class);
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private static final MemoryMeter meter = new MemoryMeter().withGuessing(MemoryMeter.Guess.FALLBACK_BEST).ignoreKnownSingletons();
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private static final long MAX_CACHE_PREPARED_MEMORY = Runtime.getRuntime().maxMemory() / 256;
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private static EntryWeigher<MD5Digest, ParsedStatement.Prepared> cqlMemoryUsageWeigher = new EntryWeigher<MD5Digest, ParsedStatement.Prepared>()
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{
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@Override
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public int weightOf(MD5Digest key, ParsedStatement.Prepared value)
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{
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return Ints.checkedCast(measure(key) + measure(value.statement) + measure(value.boundNames));
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}
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};
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private static EntryWeigher<Integer, ParsedStatement.Prepared> thriftMemoryUsageWeigher = new EntryWeigher<Integer, ParsedStatement.Prepared>()
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{
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@Override
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public int weightOf(Integer key, ParsedStatement.Prepared value)
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{
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return Ints.checkedCast(measure(key) + measure(value.statement) + measure(value.boundNames));
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}
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};
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#endif
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std::unordered_map<bytes, ::shared_ptr<statements::parsed_statement::prepared>> _prepared_statements;
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std::unordered_map<sstring, ::shared_ptr<statements::parsed_statement::prepared>> _internal_statements;
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#if 0
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private static final ConcurrentLinkedHashMap<Integer, ParsedStatement.Prepared> thriftPreparedStatements;
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// A map for prepared statements used internally (which we don't want to mix with user statement, in particular we don't
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// bother with expiration on those.
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private static final ConcurrentMap<String, ParsedStatement.Prepared> internalStatements = new ConcurrentHashMap<>();
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// Direct calls to processStatement do not increment the preparedStatementsExecuted/regularStatementsExecuted
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// counters. Callers of processStatement are responsible for correctly notifying metrics
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public static final CQLMetrics metrics = new CQLMetrics();
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private static final AtomicInteger lastMinuteEvictionsCount = new AtomicInteger(0);
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static
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{
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preparedStatements = new ConcurrentLinkedHashMap.Builder<MD5Digest, ParsedStatement.Prepared>()
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.maximumWeightedCapacity(MAX_CACHE_PREPARED_MEMORY)
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.weigher(cqlMemoryUsageWeigher)
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.listener(new EvictionListener<MD5Digest, ParsedStatement.Prepared>()
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{
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public void onEviction(MD5Digest md5Digest, ParsedStatement.Prepared prepared)
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{
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metrics.preparedStatementsEvicted.inc();
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lastMinuteEvictionsCount.incrementAndGet();
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}
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}).build();
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thriftPreparedStatements = new ConcurrentLinkedHashMap.Builder<Integer, ParsedStatement.Prepared>()
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.maximumWeightedCapacity(MAX_CACHE_PREPARED_MEMORY)
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.weigher(thriftMemoryUsageWeigher)
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.listener(new EvictionListener<Integer, ParsedStatement.Prepared>()
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{
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public void onEviction(Integer integer, ParsedStatement.Prepared prepared)
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{
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metrics.preparedStatementsEvicted.inc();
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lastMinuteEvictionsCount.incrementAndGet();
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}
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})
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.build();
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ScheduledExecutors.scheduledTasks.scheduleAtFixedRate(new Runnable()
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{
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public void run()
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{
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long count = lastMinuteEvictionsCount.getAndSet(0);
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if (count > 0)
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logger.info("{} prepared statements discarded in the last minute because cache limit reached ({} bytes)",
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count,
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MAX_CACHE_PREPARED_MEMORY);
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}
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}, 1, 1, TimeUnit.MINUTES);
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}
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public static int preparedStatementsCount()
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{
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return preparedStatements.size() + thriftPreparedStatements.size();
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}
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// Work around initialization dependency
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private static enum InternalStateInstance
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{
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INSTANCE;
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private final QueryState queryState;
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InternalStateInstance()
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{
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ClientState state = ClientState.forInternalCalls();
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try
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{
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state.setKeyspace(SystemKeyspace.NAME);
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}
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catch (InvalidRequestException e)
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{
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throw new RuntimeException();
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}
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this.queryState = new QueryState(state);
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}
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}
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private static QueryState internalQueryState()
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{
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return InternalStateInstance.INSTANCE.queryState;
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}
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private QueryProcessor()
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{
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MigrationManager.instance.register(new MigrationSubscriber());
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}
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#endif
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public:
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::shared_ptr<statements::parsed_statement::prepared> get_prepared(const bytes& id) {
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auto it = _prepared_statements.find(id);
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if (it == _prepared_statements.end()) {
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return ::shared_ptr<statements::parsed_statement::prepared>{};
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}
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return it->second;
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}
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#if 0
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public ParsedStatement.Prepared getPreparedForThrift(Integer id)
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{
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return thriftPreparedStatements.get(id);
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}
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public static void validateKey(ByteBuffer key) throws InvalidRequestException
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{
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if (key == null || key.remaining() == 0)
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{
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throw new InvalidRequestException("Key may not be empty");
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}
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// check that key can be handled by FBUtilities.writeShortByteArray
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if (key.remaining() > FBUtilities.MAX_UNSIGNED_SHORT)
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{
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throw new InvalidRequestException("Key length of " + key.remaining() +
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" is longer than maximum of " + FBUtilities.MAX_UNSIGNED_SHORT);
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}
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}
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public static void validateCellNames(Iterable<CellName> cellNames, CellNameType type) throws InvalidRequestException
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{
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for (CellName name : cellNames)
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validateCellName(name, type);
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}
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public static void validateCellName(CellName name, CellNameType type) throws InvalidRequestException
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{
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validateComposite(name, type);
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if (name.isEmpty())
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throw new InvalidRequestException("Invalid empty value for clustering column of COMPACT TABLE");
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}
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public static void validateComposite(Composite name, CType type) throws InvalidRequestException
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{
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long serializedSize = type.serializer().serializedSize(name, TypeSizes.NATIVE);
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if (serializedSize > Cell.MAX_NAME_LENGTH)
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throw new InvalidRequestException(String.format("The sum of all clustering columns is too long (%s > %s)",
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serializedSize,
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Cell.MAX_NAME_LENGTH));
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}
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#endif
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public:
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future<::shared_ptr<transport::messages::result_message>> process_statement(::shared_ptr<cql_statement> statement,
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service::query_state& query_state, const query_options& options);
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#if 0
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public static ResultMessage process(String queryString, ConsistencyLevel cl, QueryState queryState)
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throws RequestExecutionException, RequestValidationException
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{
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return instance.process(queryString, queryState, QueryOptions.forInternalCalls(cl, Collections.<ByteBuffer>emptyList()));
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}
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#endif
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future<::shared_ptr<transport::messages::result_message>> process(const std::experimental::string_view& query_string,
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service::query_state& query_state, query_options& options);
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#if 0
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public static ParsedStatement.Prepared parseStatement(String queryStr, QueryState queryState) throws RequestValidationException
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{
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return getStatement(queryStr, queryState.getClientState());
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}
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public static UntypedResultSet process(String query, ConsistencyLevel cl) throws RequestExecutionException
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{
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try
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{
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ResultMessage result = instance.process(query, QueryState.forInternalCalls(), QueryOptions.forInternalCalls(cl, Collections.<ByteBuffer>emptyList()));
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if (result instanceof ResultMessage.Rows)
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return UntypedResultSet.create(((ResultMessage.Rows)result).result);
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else
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return null;
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}
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catch (RequestValidationException e)
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{
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throw new RuntimeException(e);
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}
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}
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private static QueryOptions makeInternalOptions(ParsedStatement.Prepared prepared, Object[] values)
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{
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if (prepared.boundNames.size() != values.length)
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throw new IllegalArgumentException(String.format("Invalid number of values. Expecting %d but got %d", prepared.boundNames.size(), values.length));
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List<ByteBuffer> boundValues = new ArrayList<ByteBuffer>(values.length);
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for (int i = 0; i < values.length; i++)
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{
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Object value = values[i];
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AbstractType type = prepared.boundNames.get(i).type;
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boundValues.add(value instanceof ByteBuffer || value == null ? (ByteBuffer)value : type.decompose(value));
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}
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return QueryOptions.forInternalCalls(boundValues);
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}
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private static ParsedStatement.Prepared prepareInternal(String query) throws RequestValidationException
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{
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ParsedStatement.Prepared prepared = internalStatements.get(query);
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if (prepared != null)
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return prepared;
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// Note: if 2 threads prepare the same query, we'll live so don't bother synchronizing
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prepared = parseStatement(query, internalQueryState());
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prepared.statement.validate(internalQueryState().getClientState());
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internalStatements.putIfAbsent(query, prepared);
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return prepared;
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}
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#endif
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private:
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query_options make_internal_options(::shared_ptr<statements::parsed_statement::prepared>, const std::initializer_list<data_value>&, db::consistency_level = db::consistency_level::ONE);
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public:
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future<::shared_ptr<untyped_result_set>> execute_internal(
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const sstring& query_string,
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const std::initializer_list<data_value>& = { });
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::shared_ptr<statements::parsed_statement::prepared> prepare_internal(const sstring& query);
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future<::shared_ptr<untyped_result_set>> execute_internal(
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::shared_ptr<statements::parsed_statement::prepared>,
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const std::initializer_list<data_value>& = { });
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future<::shared_ptr<untyped_result_set>> process(
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const sstring& query_string,
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db::consistency_level, const std::initializer_list<data_value>& = { }, bool cache = false);
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future<::shared_ptr<untyped_result_set>> process(
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::shared_ptr<statements::parsed_statement::prepared>,
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db::consistency_level, const std::initializer_list<data_value>& = { });
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/*
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* This function provides a timestamp that is guaranteed to be higher than any timestamp
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* previously used in internal queries.
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*
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* This is useful because the client_state have a built-in mechanism to guarantee monotonicity.
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* Bypassing that mechanism by the use of some other clock may yield times in the past, even if the operation
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* was done in the future.
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*/
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api::timestamp_type next_timestamp();
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#if 0
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public static UntypedResultSet executeInternalWithPaging(String query, int pageSize, Object... values)
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{
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try
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{
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ParsedStatement.Prepared prepared = prepareInternal(query);
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if (!(prepared.statement instanceof SelectStatement))
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throw new IllegalArgumentException("Only SELECTs can be paged");
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SelectStatement select = (SelectStatement)prepared.statement;
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QueryPager pager = QueryPagers.localPager(select.getPageableCommand(makeInternalOptions(prepared, values)));
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return UntypedResultSet.create(select, pager, pageSize);
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}
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catch (RequestValidationException e)
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{
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throw new RuntimeException("Error validating query" + e);
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}
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}
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/**
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* Same than executeInternal, but to use for queries we know are only executed once so that the
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* created statement object is not cached.
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*/
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public static UntypedResultSet executeOnceInternal(String query, Object... values)
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{
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try
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{
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ParsedStatement.Prepared prepared = parseStatement(query, internalQueryState());
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prepared.statement.validate(internalQueryState().getClientState());
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ResultMessage result = prepared.statement.executeInternal(internalQueryState(), makeInternalOptions(prepared, values));
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if (result instanceof ResultMessage.Rows)
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return UntypedResultSet.create(((ResultMessage.Rows)result).result);
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else
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return null;
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}
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catch (RequestExecutionException e)
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{
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throw new RuntimeException(e);
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}
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catch (RequestValidationException e)
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{
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throw new RuntimeException("Error validating query " + query, e);
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}
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}
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public static UntypedResultSet resultify(String query, Row row)
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{
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return resultify(query, Collections.singletonList(row));
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}
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public static UntypedResultSet resultify(String query, List<Row> rows)
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{
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try
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{
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SelectStatement ss = (SelectStatement) getStatement(query, null).statement;
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ResultSet cqlRows = ss.process(rows);
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return UntypedResultSet.create(cqlRows);
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}
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catch (RequestValidationException e)
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{
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throw new AssertionError(e);
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}
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}
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#endif
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future<::shared_ptr<transport::messages::result_message::prepared>>
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prepare(const std::experimental::string_view& query_string, service::query_state& query_state);
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future<::shared_ptr<transport::messages::result_message::prepared>>
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prepare(const std::experimental::string_view& query_string, const service::client_state& client_state, bool for_thrift);
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static bytes compute_id(const std::experimental::string_view& query_string, const sstring& keyspace);
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#if 0
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private static Integer computeThriftId(String queryString, String keyspace)
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{
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String toHash = keyspace == null ? queryString : keyspace + queryString;
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return toHash.hashCode();
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}
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#endif
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private:
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::shared_ptr<transport::messages::result_message::prepared>
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get_stored_prepared_statement(const std::experimental::string_view& query_string, const sstring& keyspace, bool for_thrift);
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future<::shared_ptr<transport::messages::result_message::prepared>>
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store_prepared_statement(const std::experimental::string_view& query_string, const sstring& keyspace, ::shared_ptr<statements::parsed_statement::prepared> prepared, bool for_thrift);
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void invalidate_prepared_statement(bytes statement_id);
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#if 0
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public ResultMessage processPrepared(CQLStatement statement, QueryState queryState, QueryOptions options)
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throws RequestExecutionException, RequestValidationException
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{
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List<ByteBuffer> variables = options.getValues();
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// Check to see if there are any bound variables to verify
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if (!(variables.isEmpty() && (statement.getBoundTerms() == 0)))
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{
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if (variables.size() != statement.getBoundTerms())
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throw new InvalidRequestException(String.format("there were %d markers(?) in CQL but %d bound variables",
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statement.getBoundTerms(),
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variables.size()));
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// at this point there is a match in count between markers and variables that is non-zero
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if (logger.isTraceEnabled())
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for (int i = 0; i < variables.size(); i++)
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logger.trace("[{}] '{}'", i+1, variables.get(i));
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}
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metrics.preparedStatementsExecuted.inc();
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return processStatement(statement, queryState, options);
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}
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#endif
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public:
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future<::shared_ptr<transport::messages::result_message>> process_batch(::shared_ptr<statements::batch_statement>,
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service::query_state& query_state, query_options& options);
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::shared_ptr<statements::parsed_statement::prepared> get_statement(const std::experimental::string_view& query,
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const service::client_state& client_state);
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static ::shared_ptr<statements::parsed_statement> parse_statement(const std::experimental::string_view& query);
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#if 0
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private static long measure(Object key)
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{
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return meter.measureDeep(key);
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}
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#endif
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public:
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future<> stop();
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friend class migration_subscriber;
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};
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class query_processor::migration_subscriber : public service::migration_listener {
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query_processor* _qp;
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public:
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migration_subscriber(query_processor* qp);
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virtual void on_create_keyspace(const sstring& ks_name) override;
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virtual void on_create_column_family(const sstring& ks_name, const sstring& cf_name) override;
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virtual void on_create_user_type(const sstring& ks_name, const sstring& type_name) override;
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virtual void on_create_function(const sstring& ks_name, const sstring& function_name) override;
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virtual void on_create_aggregate(const sstring& ks_name, const sstring& aggregate_name) override;
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virtual void on_update_keyspace(const sstring& ks_name) override;
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virtual void on_update_column_family(const sstring& ks_name, const sstring& cf_name, bool columns_changed) override;
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virtual void on_update_user_type(const sstring& ks_name, const sstring& type_name) override;
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virtual void on_update_function(const sstring& ks_name, const sstring& function_name) override;
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virtual void on_update_aggregate(const sstring& ks_name, const sstring& aggregate_name) override;
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virtual void on_drop_keyspace(const sstring& ks_name) override;
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virtual void on_drop_column_family(const sstring& ks_name, const sstring& cf_name) override;
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virtual void on_drop_user_type(const sstring& ks_name, const sstring& type_name) override;
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virtual void on_drop_function(const sstring& ks_name, const sstring& function_name) override;
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virtual void on_drop_aggregate(const sstring& ks_name, const sstring& aggregate_name) override;
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private:
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void remove_invalid_prepared_statements(sstring ks_name, std::experimental::optional<sstring> cf_name);
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bool should_invalidate(sstring ks_name, std::experimental::optional<sstring> cf_name, ::shared_ptr<cql_statement> statement);
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};
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extern distributed<query_processor> _the_query_processor;
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inline distributed<query_processor>& get_query_processor() {
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return _the_query_processor;
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}
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inline query_processor& get_local_query_processor() {
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return _the_query_processor.local();
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}
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}
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