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https://issues.apache.org/jira/browse/FLINK-8322?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16315038#comment-16315038
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ASF GitHub Bot commented on FLINK-8322:
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Github user bowenli86 commented on the issue:
https://github.com/apache/flink/pull/5236
@aljoscha @StephanEwen This metadata of timers helps users to understand
their timer usage and write logic in code to handle it. I think it's really
helpful and convenient to provide the data out-of-box. As you said, it can be
expensive and can also be implemented as valuestate or something else by users.
I'm fine to drop it
> 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
> 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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