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https://issues.apache.org/jira/browse/FLINK-1268?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14266102#comment-14266102
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Stephan Ewen commented on FLINK-1268:
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I agree, it seems hard to solve this for local directories and make sure one
writer does not delete the other writer's files.
This is mainly relevant to local setups, so it may make sense to try and clear
the directories from the master. If they are not reachable, we don't do
anything. Sort of a best-effort cleanup.
> FileOutputFormat with overwrite does not clear local output directories
> -----------------------------------------------------------------------
>
> Key: FLINK-1268
> URL: https://issues.apache.org/jira/browse/FLINK-1268
> Project: Flink
> Issue Type: Bug
> Reporter: Till Rohrmann
>
> I noticed that the FileOutputFormat does not clear the output directories if
> it writes to local disk. This has the consequence that previous partitions
> are still contained in the directory if one decreases the DOP between
> subsequent runs. If one reads the data from this directory, then more
> partitions will be read in than were actually written. This can lead to a
> wrong user code behaviour which is hard to debug. I'm aware that in case of a
> distributed execution the TaskManagers or the Tasks have to be responsible
> for the cleanup and if multiple Tasks are running on a TaskManager, then the
> cleanup has to be coordinated.
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