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Date: Wed, 15 Feb 2017 19:04:41 +0000 (UTC)
From: "ASF GitHub Bot (JIRA)" <jira@apache.org>
To: yarn-issues@hadoop.apache.org
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Subject: [jira] [Commented] (YARN-6163) FS Preemption is a trickle for
 severely starved applications
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archived-at: Wed, 15 Feb 2017 19:04:46 -0000


    [ https://issues.apache.org/jira/browse/YARN-6163?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15868370#comment-15868370 ] 

ASF GitHub Bot commented on YARN-6163:
--------------------------------------

Github user templedf commented on a diff in the pull request:

    https://github.com/apache/hadoop/pull/192#discussion_r101355054
  
    --- Diff: hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/fair/FSAppAttempt.java ---
    @@ -1077,17 +1081,16 @@ boolean assignReservedContainer(FSSchedulerNode node) {
       }
     
       /**
    -   * Helper method that computes the extent of fairshare fairshareStarvation.
    +   * Helper method that computes the extent of fairshare starvation.
    --- End diff --
    
    Sorry, just caught this.  Missing the @return.


> FS Preemption is a trickle for severely starved applications
> ------------------------------------------------------------
>
>                 Key: YARN-6163
>                 URL: https://issues.apache.org/jira/browse/YARN-6163
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: fairscheduler
>    Affects Versions: 2.9.0
>            Reporter: Karthik Kambatla
>            Assignee: Karthik Kambatla
>         Attachments: YARN-6163.004.patch, YARN-6163.005.patch, yarn-6163-1.patch, yarn-6163-2.patch
>
>
> With current logic, only one RR is considered per each instance of marking an application starved. This marking happens only on the update call that runs every 500ms.  Due to this, an application that is severely starved takes forever to reach fairshare based on preemptions.


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