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 Outdated: we could not add a part to active set and are doing a rollback (for example it is duplicated part)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 Outdated: a part was replaced by a covering part or DROP PARTITION
* Outdated -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 Outdated: if an ZooKeeper error occurred during the deletion, we will retry deletion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Outdated, /// not active data part, but could be used by only current SELECTs, could be deleted after SELECTs finishes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