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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-6194) Cluster capacity in SchedulingPolicy is updated only on allocation file reload
Date Wed, 22 Feb 2017 21:12:44 GMT

    [ https://issues.apache.org/jira/browse/YARN-6194?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15879239#comment-15879239
] 

ASF GitHub Bot commented on YARN-6194:
--------------------------------------

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

    https://github.com/apache/hadoop/pull/196#discussion_r102573406
  
    --- Diff: hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/fair/SchedulingPolicy.java
---
    @@ -91,7 +91,23 @@ public static SchedulingPolicy parse(String policy)
         }
         return getInstance(clazz);
       }
    -  
    +
    +  /**
    +   * Initialize the scheduling policy with cluster resources. Deprecated since
    +   * it doesn't track cluster resource changes.
    +   *
    +   * @param clusterCapacity cluster resources
    +   */
    +  @Deprecated
    +  public void initialize(Resource clusterCapacity) {}
    +
    +  /**
    +   * Initialize the scheduling policy with a {@link FSContext} object which can
    --- End diff --
    
    In the future, different policies could use different information from the FSContext.
Maybe, instead of referring to it as the only thing, say something like "FSContext, which
has a pointer to the cluster resources among other information. 


> Cluster capacity in SchedulingPolicy is updated only on allocation file reload
> ------------------------------------------------------------------------------
>
>                 Key: YARN-6194
>                 URL: https://issues.apache.org/jira/browse/YARN-6194
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: fairscheduler
>    Affects Versions: 2.8.0
>            Reporter: Karthik Kambatla
>            Assignee: Yufei Gu
>
> Some of the {{SchedulingPolicy}} methods need cluster capacity which is set using {{#initialize}}
today. However, {{initialize()}} is called only on allocation reload. If nodes are added between
reloads, the cluster capacity is not considered until the next reload.



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