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https://issues.apache.org/jira/browse/FLINK-4833?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15585028#comment-15585028
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Robert Metzger commented on FLINK-4833:
---------------------------------------

But why is the error now happening to frequently? Did we change something in 
the accumulator implementation?

I got two more cases today:
https://s3.amazonaws.com/archive.travis-ci.org/jobs/168509703/log.txt
https://s3.amazonaws.com/archive.travis-ci.org/jobs/168509705/log.txt

> Unstable test 
> OperatorStatsAccumulatorTest.testAccumulatorHeavyHitterCountMinSketch
> -----------------------------------------------------------------------------------
>
>                 Key: FLINK-4833
>                 URL: https://issues.apache.org/jira/browse/FLINK-4833
>             Project: Flink
>          Issue Type: Bug
>          Components: Tests
>            Reporter: Kostas Kloudas
>              Labels: test-stability
>
> Some instances:
> view-source:https://s3.amazonaws.com/archive.travis-ci.org/jobs/167801187/log.txt
> view-source:https://s3.amazonaws.com/archive.travis-ci.org/jobs/167801191/log.txt
> view-source:https://s3.amazonaws.com/archive.travis-ci.org/jobs/167801193/log.txt
> view-source:https://s3.amazonaws.com/archive.travis-ci.org/jobs/167801195/log.txt



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