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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-5829) FS preemption should reserve a node before considering containers on it for preemption
Date Wed, 15 Mar 2017 20:27:41 GMT

    [ https://issues.apache.org/jira/browse/YARN-5829?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15926921#comment-15926921
] 

ASF GitHub Bot commented on YARN-5829:
--------------------------------------

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

    https://github.com/apache/hadoop/pull/201#discussion_r106274089
  
    --- 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
---
    @@ -831,7 +831,11 @@ private Resource assignContainer(
         }
     
         // The desired container won't fit here, so reserve
    -    if (isReservable(capability) &&
    +    // Important: Do not enable this kind of reservation in case of preemption,
    +    // since the preempted application will re-reserve the preempted resources
    +    // and prevent the starving application to get them
    +    if (!scheduler.getConf().getPreemptionEnabled() &&
    --- End diff --
    
    I improved this by giving higher priority to preempted containers than reservation. Child
queues may pass containers to each other this way resolving fairness starvation. Please review
the updated change.


> FS preemption should reserve a node before considering containers on it for preemption
> --------------------------------------------------------------------------------------
>
>                 Key: YARN-5829
>                 URL: https://issues.apache.org/jira/browse/YARN-5829
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: fairscheduler
>            Reporter: Karthik Kambatla
>            Assignee: Miklos Szegedi
>
> FS preemption evaluates nodes for preemption, and subsequently preempts identified containers.
If this node is not reserved for a specific application, any other application could be allocated
resources on this node. 
> Reserving the node for the starved application before preempting containers would help
avoid this.



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