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https://issues.apache.org/jira/browse/YARN-2884?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14645141#comment-14645141
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Hadoop QA commented on YARN-2884:
---------------------------------

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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:red}-1{color} | pre-patch |  20m 54s | Pre-patch trunk has 6 extant 
Findbugs (version 3.0.0) warnings. |
| {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 6 new or modified test files. |
| {color:green}+1{color} | javac |   7m 45s | There were no new javac warning 
messages. |
| {color:green}+1{color} | javadoc |   9m 41s | There were no new javadoc 
warning messages. |
| {color:green}+1{color} | release audit |   0m 22s | The applied patch does 
not increase the total number of release audit warnings. |
| {color:red}-1{color} | checkstyle |   2m 28s | The applied patch generated  1 
new checkstyle issues (total was 237, now 237). |
| {color:red}-1{color} | checkstyle |   3m  9s | The applied patch generated  2 
new checkstyle issues (total was 0, now 2). |
| {color:green}+1{color} | whitespace |   0m  2s | The patch has no lines that 
end in whitespace. |
| {color:green}+1{color} | install |   1m 22s | mvn install still works. |
| {color:green}+1{color} | eclipse:eclipse |   0m 34s | The patch built with 
eclipse:eclipse. |
| {color:red}-1{color} | findbugs |   6m 49s | The patch appears to introduce 1 
new Findbugs (version 3.0.0) warnings. |
| {color:green}+1{color} | yarn tests |   0m 24s | Tests passed in 
hadoop-yarn-api. |
| {color:green}+1{color} | yarn tests |   1m 55s | Tests passed in 
hadoop-yarn-common. |
| {color:green}+1{color} | yarn tests |   0m 24s | Tests passed in 
hadoop-yarn-server-common. |
| {color:red}-1{color} | yarn tests |   6m  7s | Tests failed in 
hadoop-yarn-server-nodemanager. |
| {color:green}+1{color} | yarn tests |  52m 19s | Tests passed in 
hadoop-yarn-server-resourcemanager. |
| | | 112m 12s | |
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|| Reason || Tests ||
| FindBugs | module:hadoop-yarn-server-nodemanager |
| Failed unit tests | hadoop.yarn.server.nodemanager.TestDeletionService |
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|| Subsystem || Report/Notes ||
| Patch URL | 
http://issues.apache.org/jira/secure/attachment/12747612/YARN-2884-V4.patch |
| Optional Tests | javadoc javac unit findbugs checkstyle |
| git revision | trunk / 69b0957 |
| Pre-patch Findbugs warnings | 
https://builds.apache.org/job/PreCommit-YARN-Build/8697/artifact/patchprocess/trunkFindbugsWarningshadoop-yarn-server-common.html
 |
| checkstyle |  
https://builds.apache.org/job/PreCommit-YARN-Build/8697/artifact/patchprocess/diffcheckstylehadoop-yarn-api.txt
 
https://builds.apache.org/job/PreCommit-YARN-Build/8697/artifact/patchprocess/diffcheckstylehadoop-yarn-server-common.txt
 |
| Findbugs warnings | 
https://builds.apache.org/job/PreCommit-YARN-Build/8697/artifact/patchprocess/newPatchFindbugsWarningshadoop-yarn-server-nodemanager.html
 |
| hadoop-yarn-api test log | 
https://builds.apache.org/job/PreCommit-YARN-Build/8697/artifact/patchprocess/testrun_hadoop-yarn-api.txt
 |
| hadoop-yarn-common test log | 
https://builds.apache.org/job/PreCommit-YARN-Build/8697/artifact/patchprocess/testrun_hadoop-yarn-common.txt
 |
| hadoop-yarn-server-common test log | 
https://builds.apache.org/job/PreCommit-YARN-Build/8697/artifact/patchprocess/testrun_hadoop-yarn-server-common.txt
 |
| hadoop-yarn-server-nodemanager test log | 
https://builds.apache.org/job/PreCommit-YARN-Build/8697/artifact/patchprocess/testrun_hadoop-yarn-server-nodemanager.txt
 |
| hadoop-yarn-server-resourcemanager test log | 
https://builds.apache.org/job/PreCommit-YARN-Build/8697/artifact/patchprocess/testrun_hadoop-yarn-server-resourcemanager.txt
 |
| Test Results | 
https://builds.apache.org/job/PreCommit-YARN-Build/8697/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/8697/console |


This message was automatically generated.

> Proxying all AM-RM communications
> ---------------------------------
>
>                 Key: YARN-2884
>                 URL: https://issues.apache.org/jira/browse/YARN-2884
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: nodemanager, resourcemanager
>            Reporter: Carlo Curino
>            Assignee: Kishore Chaliparambil
>         Attachments: YARN-2884-V1.patch, YARN-2884-V2.patch, 
> YARN-2884-V3.patch, YARN-2884-V4.patch
>
>
> We introduce the notion of an RMProxy, running on each node (or once per 
> rack). Upon start the AM is forced (via tokens and configuration) to direct 
> all its requests to a new services running on the NM that provide a proxy to 
> the central RM. 
> This give us a place to:
> 1) perform distributed scheduling decisions
> 2) throttling mis-behaving AMs
> 3) mask the access to a federation of RMs



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