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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