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https://issues.apache.org/jira/browse/FLINK-4651?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15721959#comment-15721959
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Ufuk Celebi commented on FLINK-4651:
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Talked to [~aljoscha] about back porting this, I think he didn't have time to
finish it yet. Won't block RC2 on this.
> Re-register processing time timers at the WindowOperator upon recovery.
> -----------------------------------------------------------------------
>
> Key: FLINK-4651
> URL: https://issues.apache.org/jira/browse/FLINK-4651
> Project: Flink
> Issue Type: Bug
> Components: Windowing Operators
> Reporter: Kostas Kloudas
> Assignee: Kostas Kloudas
> Labels: windows
> Fix For: 1.2.0, 1.1.4
>
>
> Currently the {{WindowOperator}} checkpoints the processing time timers, but
> upon recovery it does not re-registers them with the {{TimeServiceProvider}}.
> To actually reprocess them it relies on another element that will come and
> register a new timer for a future point in time. Although this is a realistic
> assumption in long running jobs, we can remove this assumption by
> re-registering the restored timers with the {{TimeServiceProvider}} in the
> {{open()}} method of the {{WindowOperator}}.
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