[
https://issues.apache.org/jira/browse/TEZ-1074?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Rajesh Balamohan updated TEZ-1074:
----------------------------------
Attachment: Screen Shot 2014-04-19 at 7.26.36 PM.png
Attaching profiler snapshot of DAGAM for reference
> DAGAppMaster takes lots of CPU when running a reasonably large job in the
> cluster
> ---------------------------------------------------------------------------------
>
> Key: TEZ-1074
> URL: https://issues.apache.org/jira/browse/TEZ-1074
> Project: Apache Tez
> Issue Type: Bug
> Reporter: Rajesh Balamohan
> Attachments: Screen Shot 2014-04-19 at 7.26.36 PM.png
>
>
> - Ran a job which used 200 containers.
> - DAGAppMaster was running at 70% most of the time during the job.
> - Profiling revealed that lots of time was spent on TezEvent.readFields -->
> ... --> TaskStatusUpdateEvent.readFields().
> - Default "tez.task.am.heartbeat.interval-ms.max=100" ms. With 200
> containers, 2000 events (these events have TezCounters) were processed by
> DAGAppMaster.
> With large job, cpu usage can bloat up significantly.
> One option to reduce CPU usage could be to send modified TezCounters in
> TezStatusUpdateEvent.
--
This message was sent by Atlassian JIRA
(v6.2#6252)
