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https://issues.apache.org/jira/browse/HDDS-8420?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17955370#comment-17955370
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Ivan Andika commented on HDDS-8420:
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[~peterxcli] Thanks for checking this out. IMO it should be ok to close this
since follower might still use SnapshotCache for other reasons, but I think we
can ask people who know more about Snapshot feature [~smeng][~hemantk]
[~swamirishi]
> [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
> Assignee: Chu Cheng Li
> Priority: Minor
>
> 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 issued
> before the leader OM to follower OM transition
> 3. new Ratis requests reading or writing to snapshot DB, including
> {{OMSnapshotMoveDeletedKeysRequest}}
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