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https://issues.apache.org/jira/browse/BEAM-732?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15566847#comment-15566847
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ASF GitHub Bot commented on BEAM-732:
-------------------------------------
Github user asfgit closed the pull request at:
https://github.com/apache/incubator-beam/pull/1069
> Placing Timers into the global window causes tests to Flake
> -----------------------------------------------------------
>
> Key: BEAM-732
> URL: https://issues.apache.org/jira/browse/BEAM-732
> Project: Beam
> Issue Type: Bug
> Reporter: Thomas Groh
> Assignee: Thomas Groh
>
> When timers are delivered in the global window rather than in empty windows,
> the fact that they may share a timestamp with pending elements causes the
> pending elements to be removed from the collection of pending elements,
> allowing the watermark to advance inappropriately.
> Only remove elements that have become pending. Use a comparator that compares
> different elements as nonequal to do so.
> See WatermarkManager.AppliedPTransformInputWatermark
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