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https://issues.apache.org/jira/browse/FLINK-6505?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16203348#comment-16203348
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ASF GitHub Bot commented on FLINK-6505:
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Github user StephanEwen commented on the issue:
https://github.com/apache/flink/pull/4798
Probably good change for now.
I think in the long run, the TaskManager should give each Task a
sub-directory and make sure that sub directory is cleared whenever tasks
finish/cancel/fail. That way this safety net is more general.
> Proactively cleanup local FS for RocksDBKeyedStateBackend on startup
> --------------------------------------------------------------------
>
> Key: FLINK-6505
> URL: https://issues.apache.org/jira/browse/FLINK-6505
> Project: Flink
> Issue Type: Sub-task
> Components: State Backends, Checkpointing
> Affects Versions: 1.3.0
> Reporter: Stefan Richter
> Assignee: Bowen Li
> Fix For: 1.4.0
>
>
> In {{RocksDBKeyedStateBackend}}, the {{instanceBasePath}} is cleared on
> {{dispose()}}. I think it might make sense to also clear this directory when
> the backend is created, in case something crashed and the backend never
> reached {{dispose()}}. At least for previous runs of the same job, we can
> know what to delete on restart.
> In general, it is very important for this backend to clean up the local FS,
> because the local quota might be very limited compared to the DFS. And a node
> that runs out of local disk space can bring down the whole job, with no way
> to recover (it might always get rescheduled to that node).
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