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https://issues.apache.org/jira/browse/FLINK-2839?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15033650#comment-15033650
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Robert Metzger commented on FLINK-2839:
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I saw a similar failure:
https://s3.amazonaws.com/archive.travis-ci.org/jobs/93956184/log.txt
> Failing test: OperatorStatsAccumulatorTest.testAccumulatorAllStatistics
> -----------------------------------------------------------------------
>
> Key: FLINK-2839
> URL: https://issues.apache.org/jira/browse/FLINK-2839
> Project: Flink
> Issue Type: Bug
> Components: flink-contrib
> Reporter: Gabor Gevay
> Priority: Minor
> Labels: test-stability
>
> I saw this test failure:
> {code}
> Tests run: 4, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 7.633 sec <<<
> FAILURE! - in
> org.apache.flink.contrib.operatorstatistics.OperatorStatsAccumulatorTest
> testAccumulatorAllStatistics(org.apache.flink.contrib.operatorstatistics.OperatorStatsAccumulatorTest)
> Time elapsed: 1.5 sec <<< FAILURE!
> java.lang.AssertionError: The total number of heavy hitters should be between
> 0 and 5.
> at org.junit.Assert.fail(Assert.java:88)
> at org.junit.Assert.assertTrue(Assert.java:41)
> at
> org.apache.flink.contrib.operatorstatistics.OperatorStatsAccumulatorTest.testAccumulatorAllStatistics(OperatorStatsAccumulatorTest.java:151)
> {code}
> Full log
> [here|https://s3.amazonaws.com/archive.travis-ci.org/jobs/84469788/log.txt].
> Maybe the test should set a constant seed to the {{Random}} object.
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