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https://issues.apache.org/jira/browse/FLINK-4651?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kostas Kloudas updated FLINK-4651:
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    Description: 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}}.  
(was: 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}}}.)

> 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: 1.1.3
>
>
> 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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