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https://issues.apache.org/jira/browse/FLINK-1268?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14222182#comment-14222182
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Fabian Hueske commented on FLINK-1268:
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I think this is how it is done for distributed FS.
The FileOutputFormat clears existing output directories in overwrite mode
before writing to distributed file systems.
This issue refers to local FS output.
> 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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