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89 lines
3.2 KiB
C++
89 lines
3.2 KiB
C++
#include <Storages/MergeTree/ReplicatedMergeTreeAltersSequence.h>
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#include <cassert>
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namespace DB
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{
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int ReplicatedMergeTreeAltersSequence::getHeadAlterVersion(std::lock_guard<std::mutex> & /*state_lock*/) const
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{
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/// If queue empty, than we don't have version
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if (!queue_state.empty())
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return queue_state.begin()->first;
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return -1;
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}
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void ReplicatedMergeTreeAltersSequence::addMutationForAlter(int alter_version, std::lock_guard<std::mutex> & /*state_lock*/)
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{
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/// Metadata alter can be added before, or
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/// maybe already finished if we startup after metadata alter was finished.
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if (!queue_state.count(alter_version))
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queue_state.emplace(alter_version, AlterState{.metadata_finished=true, .data_finished=false});
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else
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queue_state[alter_version].data_finished = false;
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}
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void ReplicatedMergeTreeAltersSequence::addMetadataAlter(
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int alter_version, bool have_mutation, std::lock_guard<std::mutex> & /*state_lock*/)
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{
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if (!queue_state.count(alter_version))
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queue_state.emplace(alter_version, AlterState{.metadata_finished=false, .data_finished=!have_mutation});
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else /// Data alter can be added before.
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queue_state[alter_version].metadata_finished = false;
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}
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void ReplicatedMergeTreeAltersSequence::finishMetadataAlter(int alter_version, std::unique_lock<std::mutex> & /*state_lock*/)
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{
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/// Sequence must not be empty
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assert(!queue_state.empty());
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/// Alters have to be finished in order
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assert(queue_state.begin()->first == alter_version);
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/// If metadata stage finished (or was never added) than we can remove this alter
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if (queue_state[alter_version].data_finished)
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queue_state.erase(alter_version);
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else
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queue_state[alter_version].metadata_finished = true;
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}
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void ReplicatedMergeTreeAltersSequence::finishDataAlter(int alter_version, std::lock_guard<std::mutex> & /*state_lock*/)
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{
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/// Queue can be empty after load of finished mutation without move of mutation pointer
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if (queue_state.empty())
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return;
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/// Mutations may finish multiple times (for example, after server restart, before update of mutation pointer)
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if (alter_version >= queue_state.begin()->first)
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{
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/// All alter versions bigger than head must present in queue.
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assert(queue_state.count(alter_version));
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if (queue_state[alter_version].metadata_finished)
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queue_state.erase(alter_version);
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else
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queue_state[alter_version].data_finished = true;
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}
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}
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bool ReplicatedMergeTreeAltersSequence::canExecuteDataAlter(int alter_version, std::lock_guard<std::mutex> & /*state_lock*/) const
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{
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/// Queue maybe empty when we start after server shutdown
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/// and have some MUTATE_PART records in queue
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if (queue_state.empty())
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return true;
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/// All versions smaller than head, can be executed
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if (alter_version < queue_state.begin()->first)
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return true;
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return queue_state.at(alter_version).metadata_finished;
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}
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bool ReplicatedMergeTreeAltersSequence::canExecuteMetaAlter(int alter_version, std::lock_guard<std::mutex> & /*state_lock*/) const
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{
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assert(!queue_state.empty());
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/// We can execute only alters of metadata which are in head.
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return queue_state.begin()->first == alter_version;
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}
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}
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