[jira] [Commented] (FLINK-17816) Change Latency Marker to work with "scheduleAtFixedDelay" instead of "scheduleAtFixedRate"

["Jiayi Liao (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-17816?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17112813#comment-17112813 ] 

Jiayi Liao commented on FLINK-17816:
------------------------------------

I guess the change would be simple. We might just need to replace {{scheduleAtFixedRate}} with {{registerTimer}} in `LatencyMarksEmitter` like this: https://github.com/Jiayi-Liao/flink/commit/7f876d6d2a8fe8fc75a41ff17a0c84141f712af6

> Change Latency Marker to work with "scheduleAtFixedDelay" instead of "scheduleAtFixedRate"
> ------------------------------------------------------------------------------------------
>
>                 Key: FLINK-17816
>                 URL: https://issues.apache.org/jira/browse/FLINK-17816
>             Project: Flink
>          Issue Type: Bug
>          Components: Runtime / Task
>            Reporter: Stephan Ewen
>            Priority: Major
>
> Latency Markers and other periodic timers are scheduled with {{scheduleAtFixedRate}}. That means every X time the callable is called. If it blocks (backpressure) is can be called immediately again.
> I would suggest to switch this to {{scheduleAtFixedDelay}}  to avoid calling for a lot of latency marker injections when there is no way to actually execute the injection call.



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