[jira] [Created] (FLINK-19377) Task can swallow test exceptions which hides test failures

[Shang Yuanchun (Jira)]

Aljoscha Krettek created FLINK-19377:
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             Summary: Task can swallow test exceptions which hides test failures
                 Key: FLINK-19377
                 URL: https://issues.apache.org/jira/browse/FLINK-19377
             Project: Flink
          Issue Type: Bug
          Components: Runtime / State Backends, Runtime / Task, Tests
            Reporter: Aljoscha Krettek


I noticed this while debugging {{EventTimeWindowCheckpointingITCase}}. If you change {{testSlidingWindows()}} to use a tumbling window instead of the sliding window the test should fail. Interestingly, the tests only fail when using the RocksDB backend but not for the heap-based backends.

You can follow the flow by setting a breakpoint on the {{AssertionError}} being thrown in {{ValidatingSink}}. Somewhere in the Task innards it will be suppressed/swallowed and the test will succeed.



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