Li Lu updated YARN-5638:
    Attachment: YARN-5638-YARN-5355.v5.patch

V5 patch to address two issues discovered with real cluster testing:
1. make sure all registering collectors are removed when an app finishes. 
2. fixes an occasional client NPE issue on RM transitioned from standby to 

> Introduce a collector timestamp to uniquely identify collectors creation 
> order in collector discovery
> -----------------------------------------------------------------------------------------------------
>                 Key: YARN-5638
>                 URL: https://issues.apache.org/jira/browse/YARN-5638
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: timelineserver
>            Reporter: Li Lu
>            Assignee: Li Lu
>         Attachments: YARN-5638-YARN-5355.v4.patch, 
> YARN-5638-YARN-5355.v5.patch, YARN-5638-trunk.v1.patch, 
> YARN-5638-trunk.v2.patch, YARN-5638-trunk.v3.patch
> As discussed in YARN-3359, we need to further identify timeline collectors' 
> creation order to rebuild collector discovery data in the RM. This JIRA 
> proposes to use <rm_timestamp, logical_version_number> to order collectors 
> for each application in the RM. This timestamp can then be used when a 
> standby RM becomes active and rebuild collector discovery data. 

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