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https://issues.apache.org/jira/browse/FLINK-4878?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15594938#comment-15594938
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Robert Metzger commented on FLINK-4878:
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Fixed logging, so that we can understand the issue better in the future:
https://github.com/apache/flink/commit/7398fdbfe024652b4299b582c2e1559da473011d
> 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
> Labels: test-stability
>
> 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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