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https://issues.apache.org/jira/browse/RATIS-2430?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tsz-wo Sze resolved RATIS-2430.
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Fix Version/s: 3.3.0
Resolution: Fixed
The pull request is now merged. Thanks, [~abhishek.pal]!
> Handle rollback on snapshot installation failure.
> -------------------------------------------------
>
> Key: RATIS-2430
> URL: https://issues.apache.org/jira/browse/RATIS-2430
> Project: Ratis
> Issue Type: Improvement
> Components: snapshot
> Reporter: Abhishek Pal
> Assignee: Abhishek Pal
> Priority: Major
> Fix For: 3.3.0
>
> Attachments: 1372_review.patch
>
> Time Spent: 50m
> Remaining Estimate: 0h
>
> Today when
> [SnapshotInstallatioHandler#checkAndInstallSnapshot|https://github.com/apache/ratis/blob/1433b4cbf7350afcf9b2f871dd48c48e17a91a1d/ratis-server/src/main/java/org/apache/ratis/server/impl/SnapshotInstallationHandler.java#L167]
> calls *state.installSnapshot(request)* - it pauses the state machine via
> *ServerState.installSnapshot()*.
> However this means that in case later checks fail or IO fails or any such
> scenario occurs, then there is no clear rollback option. Followers in this
> scenario can be left in a partial installation state.
> One way to mitigate this is in appendChunk we can write to a temp file
> without pausing StateMachine. When this is done we can atomically apply the
> snapshot and reload the statemachine log.
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