Github user zentol commented on the pull request:
https://github.com/apache/flink/pull/1031#issuecomment-132917505
using clearsinks would cause the above example with collect() to fail,
since this clears sinks aswell. (the sinks are only not cleared when
getExecutionPlan is called, it has nothing to do with a new execution).
just checking the filepath wouldn't work in my case, i distribute a folder
that resides in the same location whose content varies.
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