Till Rohrmann created FLINK-1481:
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Summary: Flakey JobManagerITCase
Key: FLINK-1481
URL: https://issues.apache.org/jira/browse/FLINK-1481
Project: Flink
Issue Type: Bug
Reporter: Till Rohrmann
Priority: Minor
We currently have some test cases which rely on non-deterministic behaviour.
For example the {{JobManagerItCase}} contains a test case with a
{{SometimesExceptionSender}} which randomly throws an exception and otherwise
blocks. The probability of a failure is 0.05 and we have 100 parallel tasks.
Thus, the overall probability that no task fails at all is still 0.005. Thus
every 200th test run, the test case will block and thus fail.
In order to get a stable test case base, I think that we should try to avoid
these kind of test cases with random behaviour. The same goes with sleep
timeouts in order to "establish" an intended interleaving of concurrent
processes. With Travis this can fail too often.
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