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https://issues.apache.org/jira/browse/YARN-5760?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vrushali C updated YARN-5760:
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Parent Issue: YARN-7055 (was: YARN-5355)
> [ATSv2] Create HBase connection only if an app collector is publishing from NM
> ------------------------------------------------------------------------------
>
> Key: YARN-5760
> URL: https://issues.apache.org/jira/browse/YARN-5760
> Project: Hadoop YARN
> Issue Type: Sub-task
> Components: timelineserver
> Reporter: Varun Saxena
> Assignee: Varun Saxena
>
> Irrespective of NM handling an app or not, we initialize
> HBaseTimelineWriterImpl in TimelineCollectorManager.
> This in turn calls ConnectionFactory#createConnection to manage connections
> with HBase.
> But it seems this opens up a connection with Zookeeper (i.e. as soon as NM
> starts up) instead of opening connection when atleast one app arrives for
> publishing and closing it if no apps are being published from this NM.
> This leads to unnecessary connections to Zookeeper.
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