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https://issues.apache.org/jira/browse/FLINK-5086?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Roman Maier reassigned FLINK-5086:
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Assignee: Roman Maier
> 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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