Haibo Chen commented on YARN-8270:

The getInstance() methods are not thread-safe, if two threads happen to see 
initialized.get() as false at the same time.

> Adding JMX Metrics for Timeline Collector and Reader
> ----------------------------------------------------
>                 Key: YARN-8270
>                 URL: https://issues.apache.org/jira/browse/YARN-8270
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: ATSv2, timelineserver
>            Reporter: Sushil Kumar S
>            Assignee: Sushil Kumar S
>            Priority: Major
>         Attachments: YARN-8270.001.patch
> This Jira is for emitting JMX Metrics for ATS v2 Timeline Collector and 
> Timeline Reader, basically for Timeline Collector it tries to capture 
> success, failure and latencies for *putEntities* and *putEntitiesAsync*  from 
> *TimelineCollectorWebService* and all the API's success, failure and 
> latencies for fetching TimelineEntities from *TimelineReaderWebServices*. 
> This would actually help in monitoring and measuring performance for ATSv2 at 
> scale.

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