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30 lines
1.5 KiB
C++
30 lines
1.5 KiB
C++
#pragma once
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namespace DB
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{
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/**
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* Part state is a stage of its lifetime. States are ordered and state of a part could be increased only.
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* Part state should be modified under data_parts mutex.
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*
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* Possible state transitions:
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* Temporary -> PreActive: we are trying to add a fetched, inserted or merged part to active set
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* PreActive -> Outdated: we could not add a part to active set and are doing a rollback (for example it is duplicated part)
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* PreActive -> Active: we successfully added a part to active dataset
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* PreActive -> Outdated: a part was replaced by a covering part or DROP PARTITION
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* Outdated -> Deleting: a cleaner selected this part for deletion
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* Deleting -> Outdated: if an ZooKeeper error occurred during the deletion, we will retry deletion
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* Active -> DeleteOnDestroy: if part was moved to another disk
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*/
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enum class MergeTreeDataPartState
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{
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Temporary, /// the part is generating now, it is not in data_parts list
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PreActive, /// the part is in data_parts, but not used for SELECTs
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Active, /// active data part, used by current and upcoming SELECTs
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Outdated, /// not active data part, but could be used by only current SELECTs, could be deleted after SELECTs finishes
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Deleting, /// not active data part with identity refcounter, it is deleting right now by a cleaner
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DeleteOnDestroy, /// part was moved to another disk and should be deleted in own destructor
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};
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}
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