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https://issues.apache.org/jira/browse/FLINK-2849?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14957139#comment-14957139
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Stephan Ewen commented on FLINK-2849:
-------------------------------------
I saw this as well. Should be fixed in an upcoming pull request. The contract
that pipeline operations (including close() ) must not be concurrent to
triggers was not correctly adhered to in that test.
> AggregatingAlignedProcessingTimeWindowOperatorTest failure
> ----------------------------------------------------------
>
> Key: FLINK-2849
> URL: https://issues.apache.org/jira/browse/FLINK-2849
> Project: Flink
> Issue Type: Bug
> Reporter: Sachin Goel
> Labels: test-stability
>
> {{testTumblingWindowDuplicateElements}} fails.
> Not much stack trace. Just an Assertion failure. Here's the entire build log
> though:
> https://travis-ci.org/apache/flink/jobs/85108826
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