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https://issues.apache.org/jira/browse/FLINK-8322?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Bowen Li closed FLINK-8322.
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Resolution: Won't Fix
> support getting number of existing timers in TimerService
> ---------------------------------------------------------
>
> Key: FLINK-8322
> URL: https://issues.apache.org/jira/browse/FLINK-8322
> Project: Flink
> Issue Type: Improvement
> Components: DataStream API
> Affects Versions: 1.4.0
> Reporter: Bowen Li
> Assignee: Bowen Li
> Priority: Major
> Fix For: 1.5.0
>
>
> There are pretty common use cases where users want to use timers as scheduled
> threads - e.g. add a timer to wake up x hours later and do something (reap
> old data usually) only if there's no existing timers, basically we only want
> at most 1 timer exists for the key all the time
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