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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-3405) FairScheduler's preemption cannot happen between sibling in some case
Date Mon, 13 Apr 2015 15:03:13 GMT

    [ https://issues.apache.org/jira/browse/YARN-3405?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14492482#comment-14492482
] 

Hadoop QA commented on YARN-3405:
---------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12724934/YARN-3405.01.patch
  against trunk revision 174d8b3.

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:green}+1 tests included{color}.  The patch appears to include 1 new or modified
test files.

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of
javac compiler warnings.

    {color:green}+1 javadoc{color}.  There were no new javadoc warning messages.

    {color:green}+1 eclipse:eclipse{color}.  The patch built with eclipse:eclipse.

    {color:red}-1 findbugs{color}.  The patch appears to introduce 1 new Findbugs (version
2.0.3) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase the total number
of release audit warnings.

    {color:green}+1 core tests{color}.  The patch passed unit tests in hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager.

Test results: https://builds.apache.org/job/PreCommit-YARN-Build/7315//testReport/
Findbugs warnings: https://builds.apache.org/job/PreCommit-YARN-Build/7315//artifact/patchprocess/newPatchFindbugsWarningshadoop-yarn-server-resourcemanager.html
Console output: https://builds.apache.org/job/PreCommit-YARN-Build/7315//console

This message is automatically generated.

> FairScheduler's preemption cannot happen between sibling in some case
> ---------------------------------------------------------------------
>
>                 Key: YARN-3405
>                 URL: https://issues.apache.org/jira/browse/YARN-3405
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: fairscheduler
>    Affects Versions: 2.7.0
>            Reporter: Peng Zhang
>            Assignee: Peng Zhang
>            Priority: Critical
>         Attachments: YARN-3405.01.patch
>
>
> Queue hierarchy described as below:
> {noformat}
>                   root
>                /         \
>        queue-1          queue-2       
>           /      \
> queue-1-1     queue-1-2
> {noformat}
> Assume cluster resource is 100
> # queue-1-1 and queue-2 has app. Each get 50 usage and 50 fairshare. 
> # When queue-1-2 is active, and it cause some new preemption request for fairshare 25.
> # When preemption from root, it has possibility to find preemption candidate is queue-2.
If so preemptContainerPreCheck for queue-2 return false because it's equal to its fairshare.
> # Finally queue-1-2 will be waiting for resource release form queue-1-1 itself.
> What I expect here is that queue-1-2 preempt from queue-1-1.



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