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From "Rohith Sharma K S (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-4755) Optimize sending appACLsUpdated event to TimelineServer while recovering completed applications
Date Thu, 03 Mar 2016 06:55:18 GMT

    [ https://issues.apache.org/jira/browse/YARN-4755?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15177366#comment-15177366
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Rohith Sharma K S commented on YARN-4755:
-----------------------------------------

bq. But appCreated will be send only whne RMApp is created and START event is fired
Event appCreated is sent in RMAppImpl constructor which always go first. So I think events
appCreated and appACLUpdated can be clubbed together unless there is no dependencies from
timelineserver end.
 

> Optimize sending appACLsUpdated event to TimelineServer while recovering completed applications
> -----------------------------------------------------------------------------------------------
>
>                 Key: YARN-4755
>                 URL: https://issues.apache.org/jira/browse/YARN-4755
>             Project: Hadoop YARN
>          Issue Type: Improvement
>            Reporter: Rohith Sharma K S
>            Assignee: Naganarasimha G R
>
> In method {{RMAppManager#createAndPopulateNewRMApp}}, appACLsUpdated is sent to timelineserver
for every application that get created. 
> {code}
>  private RMAppImpl createAndPopulateNewRMApp(
>       ApplicationSubmissionContext submissionContext, long submitTime,
>       String user, boolean isRecovery) throws YarnException {
> 		//
>                 //
>     String appViewACLs = submissionContext.getAMContainerSpec()
>         .getApplicationACLs().get(ApplicationAccessType.VIEW_APP);
>     rmContext.getSystemMetricsPublisher().appACLsUpdated(
>         application, appViewACLs, System.currentTimeMillis());
>     return application;
>   }
> {code}
> Say if we have 10K completed applications to recover, 30K events will be generated i.e
app_created, app_finished and app_acl_updated. For completed applications, I think need not
to send app-acl-updated event with which gradually reduce load on the dispatcher. 
> Eventhough MultiDispatcher is used to publish timeline events, it is bottle neck when
max-completed is configured very high value may be 100K.



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