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https://issues.apache.org/jira/browse/YARN-6850?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16095697#comment-16095697
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Vrushali C commented on YARN-6850:
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If we don't want to update the documentation here, could you add in a note in
the documentation jira so that we don't miss this.
> Ensure that supplemented timestamp is stored only for flow run metrics
> ----------------------------------------------------------------------
>
> Key: YARN-6850
> URL: https://issues.apache.org/jira/browse/YARN-6850
> Project: Hadoop YARN
> Issue Type: Sub-task
> Components: timelineserver
> Reporter: Vrushali C
> Assignee: Varun Saxena
> Labels: yarn-5355-merge-blocker
> Attachments: YARN-6850-YARN-5355.01.patch
>
>
> In timeline service v2, ColumnHelper#getPutTimestamp supplements the
> timestamp and is called by ColumnHelper#store. This is not conditional and
> called for every put.
> We need to ensure that the cell timestamps for metrics in entity and
> application (and sub application) tables are "correct" timestamps since we
> will be enabling TTLs for these cells.
> The supplemented timestamp is to be used only in the flow run table by the
> coprocessor which intercepts all reads & writes to cells in this table. It
> looks at the supplemented timestamp to figure out which app id this
> particular cell belongs to. This is done in order to ensure no collision
> occurs when two apps belonging to same flow run write the same metric at the
> same timestamp.
> Discovered in the discussion in YARN-4455
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