Stephan Ewen commented on FLINK-4651:

How will this be resolved?

> 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, 1.1.3
> 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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