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Date: Tue, 13 Sep 2016 00:23:20 +0000 (UTC)
From: "ASF GitHub Bot (JIRA)" <jira@apache.org>
To: yarn-issues@hadoop.apache.org
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Subject: [jira] [Commented] (YARN-5605) Preempt containers (all on one node)
 to meet the requirement of starved applications
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archived-at: Tue, 13 Sep 2016 00:23:23 -0000


    [ https://issues.apache.org/jira/browse/YARN-5605?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15485753#comment-15485753 ] 

ASF GitHub Bot commented on YARN-5605:
--------------------------------------

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

    https://github.com/apache/hadoop/pull/124#discussion_r78478634
  
    --- 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 ---
    @@ -557,28 +599,33 @@ private boolean preemptContainerPreCheck() {
             getFairShare());
       }
     
    -  /**
    -   * Is a queue being starved for its min share.
    -   */
    -  @VisibleForTesting
    -  boolean isStarvedForMinShare() {
    -    return isStarved(getMinShare());
    +  private Resource minShareStarvation() {
    +    Resource desiredShare = Resources.min(policy.getResourceCalculator(),
    +        scheduler.getClusterResource(), getMinShare(), getDemand());
    +
    +    Resource starvation = Resources.subtract(desiredShare, getResourceUsage());
    +    boolean starved = Resources.greaterThan(policy.getResourceCalculator(),
    +        scheduler.getClusterResource(), starvation, none());
    +
    +    long now = scheduler.getClock().getTime();
    +    if (!starved) {
    +      setLastTimeAtMinShare(now);
    +    }
    +
    +    if (starved &&
    +        (now - lastTimeAtMinShare > getMinSharePreemptionTimeout())) {
    +      return starvation;
    +    } else {
    +      return Resources.clone(Resources.none());
    --- End diff --
    
    Actually, this can be simplified further. Improvement in updated patch. 


> Preempt containers (all on one node) to meet the requirement of starved applications
> ------------------------------------------------------------------------------------
>
>                 Key: YARN-5605
>                 URL: https://issues.apache.org/jira/browse/YARN-5605
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: fairscheduler
>            Reporter: Karthik Kambatla
>            Assignee: Karthik Kambatla
>         Attachments: yarn-5605-1.patch, yarn-5605-2.patch
>
>
> Required items:
> # Identify starved applications
> # Identify a node that has enough containers from applications over their fairshare.
> # Preempt those containers


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