Github user chiwanpark commented on the pull request:
https://github.com/apache/incubator-flink/pull/226#issuecomment-65237135
Right. When the FileStreamFunction run multiple times in cluster, all
instance of cluster will see modified file and process it. It will create
duplicated records. I haven't tested with a cluster on YARN yet, but I have
tested with local cluster with 5 parallelism and the result is same as exactly
expected.
I think that this must be mentioned in document.
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