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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 Thu, 23 Mar 2017 22:51:42 GMT

    [ https://issues.apache.org/jira/browse/YARN-5829?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15939380#comment-15939380
] 

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

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

    https://github.com/apache/hadoop/pull/201#discussion_r107801268
  
    --- Diff: hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/fair/FairScheduler.java
---
    @@ -93,15 +91,8 @@
     import org.apache.hadoop.yarn.util.resource.Resources;
     
     import java.io.IOException;
    -import java.util.ArrayList;
    -import java.util.Collection;
    -import java.util.Comparator;
    -import java.util.EnumSet;
    -import java.util.HashSet;
    -import java.util.List;
    -import java.util.Map;
    +import java.util.*;
    --- End diff --
    
    Same comment as above. Let us avoid using wildcard imports


> 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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