mirror of https://gitee.com/bigwinds/arangodb
101 lines
4.0 KiB
C++
101 lines
4.0 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// DISCLAIMER
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///
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/// Copyright 2014-2016 ArangoDB GmbH, Cologne, Germany
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/// Copyright 2004-2014 triAGENS GmbH, Cologne, Germany
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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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/// Copyright holder is ArangoDB GmbH, Cologne, Germany
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///
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/// @author Jan Steemann
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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGOD_REPLICATION_DATABASE_TAILING_SYNCER_H
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#define ARANGOD_REPLICATION_DATABASE_TAILING_SYNCER_H 1
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#include "Replication/DatabaseReplicationApplier.h"
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#include "Replication/ReplicationApplierConfiguration.h"
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#include "TailingSyncer.h"
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namespace arangodb {
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class DatabaseReplicationApplier;
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class DatabaseTailingSyncer final : public TailingSyncer {
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public:
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DatabaseTailingSyncer(TRI_vocbase_t& vocbase,
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ReplicationApplierConfiguration const& configuration,
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TRI_voc_tick_t initialTick, bool useTick, TRI_voc_tick_t barrierId);
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TRI_vocbase_t* resolveVocbase(velocypack::Slice const&) override {
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return _vocbase;
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}
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/// @brief return the syncer's replication applier
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DatabaseReplicationApplier* applier() const {
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return static_cast<DatabaseReplicationApplier*>(_applier);
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}
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/// @brief finalize the synchronization of a collection by tailing the WAL
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/// and filtering on the collection name until no more data is available
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Result syncCollectionFinalize(std::string const& collectionName) {
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TRI_voc_tick_t dummy = 0;
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bool dummyDidTimeout = false;
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double dummyTimeout = 300.0;
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return syncCollectionCatchupInternal(collectionName, dummyTimeout, true,
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dummy, dummyDidTimeout);
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}
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/// @brief catch up with changes in a leader shard by doing the same
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/// as in syncCollectionFinalize, but potentially stopping earlier.
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/// This function will use some heuristics to stop early, when most
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/// of the catching up is already done. In this case, the replication
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/// will end and store the tick to which it got in the argument `until`.
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/// The idea is that one can use `syncCollectionCatchup` without stopping
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/// writes on the leader to catch up mostly. Then one can stop writes
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/// by getting an exclusive lock on the leader and use
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/// `syncCollectionFinalize` to finish off the rest.
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/// Internally, both use `syncCollectionCatchupInternal`.
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Result syncCollectionCatchup(std::string const& collectionName, double timeout,
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TRI_voc_tick_t& until, bool& didTimeout) {
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return syncCollectionCatchupInternal(collectionName, timeout, false, until, didTimeout);
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}
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protected:
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Result syncCollectionCatchupInternal(std::string const& collectionName,
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double timeout, bool hard,
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TRI_voc_tick_t& until, bool& didTimeout);
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/// @brief save the current applier state
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Result saveApplierState() override;
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TRI_vocbase_t* vocbase() const {
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TRI_ASSERT(vocbases().size() == 1);
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return &(vocbases().begin()->second.database());
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}
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/// @brief whether or not we should skip a specific marker
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bool skipMarker(arangodb::velocypack::Slice const& slice) override;
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private:
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/// @brief vocbase to use for this run
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TRI_vocbase_t* _vocbase;
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/// @brief translation between globallyUniqueId and collection name
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std::unordered_map<std::string, std::string> _translations;
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bool _queriedTranslations;
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};
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} // namespace arangodb
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#endif
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