Junping Du commented on YARN-3046:

bq. Shall we do nullcheck in TimelineEvent. Theoretically, we shouldn't block 
users from putting null value, though in this case we may want to avoid it. 
However, we can do it at the HistoryEvent side.
I see. Let's remove nullcheck in TimelineEvent part. HistoryEvent is also a 
consumer. If we have assumption to allow consumer to put null value, should be 
fine in this case.

> [Event producers] Implement MapReduce AM writing some MR metrics to ATS
> -----------------------------------------------------------------------
>                 Key: YARN-3046
>                 URL: https://issues.apache.org/jira/browse/YARN-3046
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: timelineserver
>            Reporter: Sangjin Lee
>            Assignee: Junping Du
>         Attachments: YARN-3046-no-test-v2.patch, YARN-3046-no-test.patch, 
> YARN-3046-v1-rebase.patch, YARN-3046-v1.patch, YARN-3046-v2.patch, 
> YARN-3046-v3.patch
> Per design in YARN-2928, select a handful of MR metrics (e.g. HDFS bytes 
> written) and have the MR AM write the framework-specific metrics to ATS.

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