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Date: Mon, 21 Aug 2017 18:32:01 +0000 (UTC)
From: "ASF GitHub Bot (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (YARN-2162) add ability in Fair Scheduler to
 optionally configure maxResources in terms of percentage
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archived-at: Mon, 21 Aug 2017 18:32:09 -0000


    [ https://issues.apache.org/jira/browse/YARN-2162?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16135565#comment-16135565 ] 

ASF GitHub Bot commented on YARN-2162:
--------------------------------------

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

    https://github.com/apache/hadoop/pull/261#discussion_r134299321
  
    --- Diff: hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/fair/AllocationConfiguration.java ---
    @@ -293,26 +293,15 @@ Resource getMinResources(String queue) {
     
       /**
        * Get the maximum resource allocation for the given queue. If the max in not
    -   * set, return the larger of the min and the default max.
    +   * set, return the default max.
    --- End diff --
    
    I changed it since this is not the right place to do that. I move this behavior to FSQueue#getMaxShare. The reason is allocation file reload and cluster resource changing are two independent events. It is not right to calculate based on cluster resource while refresh the allocation file.


> add ability in Fair Scheduler to optionally configure maxResources in terms of percentage
> -----------------------------------------------------------------------------------------
>
>                 Key: YARN-2162
>                 URL: https://issues.apache.org/jira/browse/YARN-2162
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: fairscheduler, scheduler
>            Reporter: Ashwin Shankar
>            Assignee: Yufei Gu
>              Labels: scheduler
>         Attachments: YARN-2162.001.patch, YARN-2162.002.patch
>
>
> minResources and maxResources in fair scheduler configs are expressed in terms of absolute numbers X mb, Y vcores. 
> As a result, when we expand or shrink our hadoop cluster, we need to recalculate and change minResources/maxResources accordingly, which is pretty inconvenient.
> We can circumvent this problem if we can optionally configure these properties in terms of percentage of cluster capacity. 


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