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From "Vrushali C (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-6850) Ensure that supplemented timestamp is stored only for flow run metrics
Date Fri, 21 Jul 2017 02:43:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-6850?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16095697#comment-16095697

Vrushali C commented on YARN-6850:

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
> 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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