124 lines
4.0 KiB
C++
124 lines
4.0 KiB
C++
/*
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* DatabaseConfiguration.h
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*
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* This source file is part of the FoundationDB open source project
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*
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* Copyright 2013-2018 Apple Inc. and the FoundationDB project authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* 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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#ifndef FDBSERVER_DATABASECONFIGURATION_H
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#define FDBSERVER_DATABASECONFIGURATION_H
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#pragma once
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#include "fdbclient/FDBTypes.h"
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#include "fdbclient/CommitTransaction.h"
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#include "fdbrpc/ReplicationPolicy.h"
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// SOMEDAY: Buggify DatabaseConfiguration
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struct DatabaseConfiguration {
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DatabaseConfiguration();
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void applyMutation( MutationRef mutation );
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bool set( KeyRef key, ValueRef value ); // Returns true if a configuration option that requires recovery to take effect is changed
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bool clear( KeyRangeRef keys );
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Optional<ValueRef> get( KeyRef key ) const;
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bool isValid() const;
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bool initialized;
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std::string toString() const;
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std::map<std::string, std::string> toMap() const;
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// SOMEDAY: think about changing storageTeamSize to durableStorageQuorum
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int32_t minMachinesRequired() const { return std::max(tLogReplicationFactor, storageTeamSize); }
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int32_t maxMachineFailuresTolerated() const { return std::min(tLogReplicationFactor - 1 - tLogWriteAntiQuorum, durableStorageQuorum - 1); }
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// Redundancy Levels
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IRepPolicyRef storagePolicy;
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// MasterProxy Servers
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int32_t masterProxyCount;
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int32_t autoMasterProxyCount;
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// Resolvers
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int32_t resolverCount;
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int32_t autoResolverCount;
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// TLogs
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int32_t desiredTLogCount;
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int32_t autoDesiredTLogCount;
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int32_t tLogWriteAntiQuorum;
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int32_t tLogReplicationFactor;
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KeyValueStoreType tLogDataStoreType;
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IRepPolicyRef tLogPolicy;
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// Storage servers
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int32_t durableStorageQuorum;
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int32_t storageTeamSize;
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KeyValueStoreType storageServerStoreType;
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// Excluded servers (no state should be here)
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bool isExcludedServer( NetworkAddress ) const;
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std::set<AddressExclusion> getExcludedServers() const;
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int32_t getDesiredProxies() const { if(masterProxyCount == -1) return autoMasterProxyCount; return masterProxyCount; }
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int32_t getDesiredResolvers() const { if(resolverCount == -1) return autoResolverCount; return resolverCount; }
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int32_t getDesiredLogs() const { if(desiredTLogCount == -1) return autoDesiredTLogCount; return desiredTLogCount; }
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bool operator == ( DatabaseConfiguration const& rhs ) const {
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const_cast<DatabaseConfiguration*>(this)->makeConfigurationImmutable();
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const_cast<DatabaseConfiguration*>(&rhs)->makeConfigurationImmutable();
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return rawConfiguration == rhs.rawConfiguration;
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}
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template <class Ar>
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void serialize(Ar& ar) {
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if (!ar.isDeserializing) makeConfigurationImmutable();
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ar & rawConfiguration;
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if (ar.isDeserializing) {
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for(auto c=rawConfiguration.begin(); c!=rawConfiguration.end(); ++c)
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setInternal(c->key, c->value);
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if(!storagePolicy || !tLogPolicy) {
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setDefaultReplicationPolicy();
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}
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}
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}
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void fromKeyValues( Standalone<VectorRef<KeyValueRef>> rawConfig ) {
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resetInternal();
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this->rawConfiguration = rawConfig;
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for(auto c=rawConfiguration.begin(); c!=rawConfiguration.end(); ++c)
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setInternal(c->key, c->value);
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if(!storagePolicy || !tLogPolicy) {
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setDefaultReplicationPolicy();
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}
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}
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private:
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Optional< std::map<std::string, std::string> > mutableConfiguration; // If present, rawConfiguration is not valid
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Standalone<VectorRef<KeyValueRef>> rawConfiguration; // sorted by key
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void makeConfigurationMutable();
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void makeConfigurationImmutable();
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bool setInternal( KeyRef key, ValueRef value );
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void resetInternal();
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void setDefaultReplicationPolicy();
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};
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#endif
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