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https://issues.apache.org/jira/browse/FLINK-4863?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15593811#comment-15593811
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Manu Zhang commented on FLINK-4863:
-----------------------------------
Found this is related to FLINK-4862. {{ContinuousEventTimeTrigger}}'s original
state ({{fireTimestamp}}) is already cleared in
{{context.onMerge(mergeWindows)}} so that the original {{Timer}} cannot be
removed by the {{fireTimestamp}} in {{context.clear()}} later. I will close
this and try fixing in FLINK-4862.
> states of merging window and trigger are set to different TimeWindows on merge
> ------------------------------------------------------------------------------
>
> Key: FLINK-4863
> URL: https://issues.apache.org/jira/browse/FLINK-4863
> Project: Flink
> Issue Type: Bug
> Components: Streaming, Windowing Operators
> Reporter: Manu Zhang
>
> While window state is set to the mergeResult's stateWindow (one of original
> windows), trigger state is set to the mergeResult itself. This will fail
> {{Timer}} of {{ContinuousEventTimeTrigger}} since its window cannot be found
> in the window state.
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