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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-6163) FS Preemption is a trickle for severely starved applications
Date Wed, 15 Feb 2017 04:00:44 GMT

    [ https://issues.apache.org/jira/browse/YARN-6163?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15867178#comment-15867178
] 

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

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

    https://github.com/apache/hadoop/pull/192#discussion_r101199879
  
    --- Diff: hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/fair/FSLeafQueue.java
---
    @@ -247,23 +247,23 @@ private Resource updateStarvedAppsFairshare(
        * @param minShareStarvation minshare starvation to distribute
        */
       private void updateStarvedAppsMinshare(
    -      TreeSet<FSAppAttempt> appsWithDemand, Resource minShareStarvation) {
    +      TreeSet<FSAppAttempt> appsWithDemand, final Resource minShareStarvation)
{
    --- End diff --
    
    Fixed


> 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-6163-1.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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