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https://issues.apache.org/jira/browse/YARN-4700?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15169923#comment-15169923
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Vrushali C commented on YARN-4700:
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I see. So when events are being replayed, we making new entries in the flow 
activity table since we are using the current time.

Yes, I think we should use the event timestamp. Should be a simple enough fix, 
take the event timestamp for the CREATED or the FINISHED event and use that 
instead of null in the HBaseTimelineWriterImpl#storeInFlowActivityTable 
function. 

> ATS storage has one extra record each time the RM got restarted
> ---------------------------------------------------------------
>
>                 Key: YARN-4700
>                 URL: https://issues.apache.org/jira/browse/YARN-4700
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: timelineserver
>    Affects Versions: YARN-2928
>            Reporter: Li Lu
>            Assignee: Naganarasimha G R
>              Labels: yarn-2928-1st-milestone
>
> When testing the new web UI for ATS v2, I noticed that we're creating one 
> extra record for each finished application (but still hold in the RM state 
> store) each time the RM got restarted. It's quite possible that we add the 
> cluster start timestamp into the default cluster id, thus each time we're 
> creating a new record for one application (cluster id is a part of the row 
> key). We need to fix this behavior, probably by having a better default 
> cluster id. 



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