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https://issues.apache.org/jira/browse/FLINK-1481?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Till Rohrmann closed FLINK-1481.
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Resolution: Fixed
Fixed with 0ccd1fd5b90dbdacb579e329016a0819cd301d43
> 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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