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https://issues.apache.org/jira/browse/FLINK-5086?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15774803#comment-15774803
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Till Rohrmann commented on FLINK-5086:
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Hi Roman,
this feature is a little bit more involved and there are definitely more easily
approachable problems open in Flink.
Before starting implementing something, it is always advisable to first discuss
your problem solution with the community. Otherwise your work might be in vain
if it turns out to conflict with other components.
> Clean dead snapshot files produced by the tasks failing to acknowledge
> checkpoints
> ----------------------------------------------------------------------------------
>
> Key: FLINK-5086
> URL: https://issues.apache.org/jira/browse/FLINK-5086
> Project: Flink
> Issue Type: Bug
> Components: State Backends, Checkpointing
> Reporter: Xiaogang Shi
> Assignee: Roman Maier
>
> A task may fail when performing checkpoints. In that case, the task may have
> already copied some data to external storage. But since the task fails to
> send the state handler to {{CheckpointCoordinator}}, the copied data will not
> be deleted by {{CheckpointCoordinator}}.
> I think we must find a method to clean such dead snapshot data to avoid
> unlimited usage of external storage.
> One possible method is to clean these dead files when the task recovers. When
> a task recovers, {{CheckpointCoordinator}} will tell the task all the
> retained checkpoints. The task then can scan the external storage to delete
> all the snapshots not in these retained checkpoints.
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