Github user aljoscha commented on the issue:
https://github.com/apache/flink/pull/3911
@rmetzger Yes, the test deletes the log files so that additional tests will
start from a clean slate. I might be able to modify the Flink config so that
each test gets it's own log directory.
Could it be that you already had some log files in your `build-target`
Flink installation? This would cause the test to fail if they contain
errors/exceptions.
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