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https://issues.apache.org/jira/browse/YARN-8270?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16479178#comment-16479178
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Haibo Chen commented on YARN-8270:
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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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