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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-4287) Capacity Scheduler: Rack Locality improvement
Date Wed, 18 Nov 2015 22:37:11 GMT

    [ https://issues.apache.org/jira/browse/YARN-4287?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15012215#comment-15012215
] 

Hudson commented on YARN-4287:
------------------------------

FAILURE: Integrated in Hadoop-Mapreduce-trunk-Java8 #681 (See [https://builds.apache.org/job/Hadoop-Mapreduce-trunk-Java8/681/])
move fix version of YARN-4287 from 2.8.0 to 2.7.3 (wangda: rev 23a130abd7f26ca95d7e94988c7bc45c6d419d0f)
* hadoop-yarn-project/CHANGES.txt


> Capacity Scheduler: Rack Locality improvement
> ---------------------------------------------
>
>                 Key: YARN-4287
>                 URL: https://issues.apache.org/jira/browse/YARN-4287
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: capacityscheduler
>    Affects Versions: 2.7.1
>            Reporter: Nathan Roberts
>            Assignee: Nathan Roberts
>             Fix For: 2.8.0
>
>         Attachments: YARN-4287-minimal-v2.patch, YARN-4287-minimal-v3.patch, YARN-4287-minimal-v4-branch-2.7.patch,
YARN-4287-minimal-v4.patch, YARN-4287-minimal.patch, YARN-4287-v2.patch, YARN-4287-v3.patch,
YARN-4287-v4.patch, YARN-4287.patch
>
>
> YARN-4189 does an excellent job describing the issues with the current delay scheduling
algorithms within the capacity scheduler. The design proposal also seems like a good direction.
> This jira proposes a simple interim solution to the key issue we've been experiencing
on a regular basis:
>  - rackLocal assignments trickle out due to nodeLocalityDelay. This can have significant
impact on things like CombineFileInputFormat which targets very specific nodes in its split
calculations.
> I'm not sure when YARN-4189 will become reality so I thought a simple interim patch might
make sense. The basic idea is simple: 
> 1) Separate delays for rackLocal, and OffSwitch (today there is only 1)
> 2) When we're getting rackLocal assignments, subsequent rackLocal assignments should
not be delayed
> Patch will be uploaded shortly. No big deal if the consensus is to go straight to YARN-4189.




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