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https://issues.apache.org/jira/browse/HDDS-8420?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Siyao Meng updated HDDS-8420:
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Description:
SnapshotCache can be cleaned up when OM leader transitions to a follower. But
not by simply calling {{snapshotCache.invalidateAll()}}.
Cache entries with zero refCount can be safely invalidated. However, it could
happen that some instances are still in-use by:
1. running SnapshotDiff jobs that is not finished during leader to follower
transition -- those jobs need to be cancelled/aborted
2. any unfinished client read or write requests against snapshots before the
leader OM to follower OM transition
3. new Ratis requests reading or writing to snapshot DB, including
{{OMSnapshotMoveDeletedKeysRequest}}
was:
SnapshotCache can be cleaned up when OM leader transitions to a follower. But
not by simply calling {{snapshotCache.invalidateAll()}}.
Cache entries with zero refCount can be safely invalidated. However, it could
happen that some instances are still in-use by:
1. running SnapshotDiff jobs that is not finished during leader to follower
transition -- those jobs need to be cancelled/aborted
2. any unfinished client read or write requests against snapshots
3. new Ratis requests reading or writing to snapshot DB, including
{{OMSnapshotMoveDeletedKeysRequest}}
> [Snapshot] Optionally purge SnapshotCache on OM (ex)leader when it
> transitions to a follower
> --------------------------------------------------------------------------------------------
>
> Key: HDDS-8420
> URL: https://issues.apache.org/jira/browse/HDDS-8420
> Project: Apache Ozone
> Issue Type: Sub-task
> Reporter: Siyao Meng
> Priority: Major
>
> SnapshotCache can be cleaned up when OM leader transitions to a follower. But
> not by simply calling {{snapshotCache.invalidateAll()}}.
> Cache entries with zero refCount can be safely invalidated. However, it could
> happen that some instances are still in-use by:
> 1. running SnapshotDiff jobs that is not finished during leader to follower
> transition -- those jobs need to be cancelled/aborted
> 2. any unfinished client read or write requests against snapshots before the
> leader OM to follower OM transition
> 3. new Ratis requests reading or writing to snapshot DB, including
> {{OMSnapshotMoveDeletedKeysRequest}}
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