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https://issues.apache.org/jira/browse/YARN-4287?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14968300#comment-14968300
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Hadoop QA commented on YARN-4287:
---------------------------------

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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | pre-patch |  20m 24s | Pre-patch trunk compilation is 
healthy. |
| {color:green}+1{color} | @author |   0m  0s | The patch does not contain any 
@author tags. |
| {color:green}+1{color} | tests included |   0m  0s | The patch appears to 
include 2 new or modified test files. |
| {color:green}+1{color} | javac |  10m 42s | There were no new javac warning 
messages. |
| {color:green}+1{color} | javadoc |  15m  3s | There were no new javadoc 
warning messages. |
| {color:green}+1{color} | release audit |   0m 48s | The applied patch does 
not increase the total number of release audit warnings. |
| {color:red}-1{color} | checkstyle |   1m 16s | The applied patch generated  
13 new checkstyle issues (total was 257, now 268). |
| {color:red}-1{color} | whitespace |   0m 10s | The patch has 1  line(s) that 
end in whitespace. Use git apply --whitespace=fix. |
| {color:green}+1{color} | install |   3m 13s | mvn install still works. |
| {color:green}+1{color} | eclipse:eclipse |   0m 53s | The patch built with 
eclipse:eclipse. |
| {color:green}+1{color} | findbugs |   2m 17s | The patch does not introduce 
any new Findbugs (version 3.0.0) warnings. |
| {color:red}-1{color} | yarn tests |  60m 42s | Tests failed in 
hadoop-yarn-server-resourcemanager. |
| | | 115m 33s | |
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|| Reason || Tests ||
| Failed unit tests | 
hadoop.yarn.server.resourcemanager.scheduler.capacity.TestLeafQueue |
|   | 
hadoop.yarn.server.resourcemanager.scheduler.capacity.TestApplicationLimits |
|   | hadoop.yarn.server.resourcemanager.scheduler.fair.TestFSAppAttempt |
| Timed out tests | org.apache.hadoop.yarn.server.resourcemanager.TestRM |
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|| Subsystem || Report/Notes ||
| Patch URL | 
http://issues.apache.org/jira/secure/attachment/12767900/YARN-4287.patch |
| Optional Tests | javadoc javac unit findbugs checkstyle |
| git revision | trunk / d1cdce7 |
| checkstyle |  
https://builds.apache.org/job/PreCommit-YARN-Build/9516/artifact/patchprocess/diffcheckstylehadoop-yarn-server-resourcemanager.txt
 |
| whitespace | 
https://builds.apache.org/job/PreCommit-YARN-Build/9516/artifact/patchprocess/whitespace.txt
 |
| hadoop-yarn-server-resourcemanager test log | 
https://builds.apache.org/job/PreCommit-YARN-Build/9516/artifact/patchprocess/testrun_hadoop-yarn-server-resourcemanager.txt
 |
| Test Results | 
https://builds.apache.org/job/PreCommit-YARN-Build/9516/testReport/ |
| Java | 1.7.0_55 |
| uname | Linux asf901.gq1.ygridcore.net 3.13.0-36-lowlatency #63-Ubuntu SMP 
PREEMPT Wed Sep 3 21:56:12 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux |
| Console output | 
https://builds.apache.org/job/PreCommit-YARN-Build/9516/console |


This message was automatically generated.

> 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
>         Attachments: 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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