[jira] [Created] (FLINK-4878) ReduceTaskExternalITCase.testMultiLevelMergeCombiningReduceTask test instable

[Shang Yuanchun (Jira)]

Robert Metzger created FLINK-4878:
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             Summary: ReduceTaskExternalITCase.testMultiLevelMergeCombiningReduceTask test instable
                 Key: FLINK-4878
                 URL: https://issues.apache.org/jira/browse/FLINK-4878
             Project: Flink
          Issue Type: Bug
          Components: Local Runtime
    Affects Versions: 1.2.0
            Reporter: Robert Metzger


The {{ReduceTaskExternalITCase.testMultiLevelMergeCombiningReduceTask}} test failed with the following error

{code}
testMultiLevelMergeCombiningReduceTask[0](org.apache.flink.runtime.operators.ReduceTaskExternalITCase)  Time elapsed: 0.233 sec  <<< FAILURE!
java.lang.AssertionError: Invoke method caused exception.
        at org.junit.Assert.fail(Assert.java:88)
        at org.apache.flink.runtime.operators.ReduceTaskExternalITCase.testMultiLevelMergeCombiningReduceTask(ReduceTaskExternalITCase.java:193)
{code}

Here is the log https://s3.amazonaws.com/archive.travis-ci.org/jobs/169181202/log.txt

Sadly, the test is not logging the exception at INFO level, so we can not really understand what's going on.

I'll push a commit improving the logging.



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