Github user StephanEwen commented on the issue:
https://github.com/apache/flink/pull/3035
Bit of background how the error happens:
- The test throws a `SuccessException`
- While being in the finally clause and shutting down the CluratorClient,
the containing `Task` has not seen the exception.
- When the commitOffsets() call fails, this overrides the
`SuccessException` as the reason why the streaming program terminated.
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