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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-3508) Preemption processing occuring on the main RM dispatcher
Date Sun, 31 May 2015 10:59:18 GMT

    [ https://issues.apache.org/jira/browse/YARN-3508?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14566509#comment-14566509
] 

Hadoop QA commented on YARN-3508:
---------------------------------

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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | pre-patch |  15m 56s | 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 1 new
or modified test files. |
| {color:green}+1{color} | javac |   7m 35s | There were no new javac warning messages. |
| {color:green}+1{color} | javadoc |   9m 36s | 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 |   0m 46s | The applied patch generated  1 new checkstyle
issues (total was 53, now 53). |
| {color:green}+1{color} | whitespace |   0m  0s | The patch has no lines that end in whitespace.
|
| {color:green}+1{color} | install |   1m 36s | mvn install still works. |
| {color:green}+1{color} | eclipse:eclipse |   0m 32s | The patch built with eclipse:eclipse.
|
| {color:green}+1{color} | findbugs |   1m 25s | The patch does not introduce any new Findbugs
(version 3.0.0) warnings. |
| {color:green}+1{color} | yarn tests |  50m 24s | Tests passed in hadoop-yarn-server-resourcemanager.
|
| | |  88m 15s | |
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|| Subsystem || Report/Notes ||
| Patch URL | http://issues.apache.org/jira/secure/attachment/12736416/YARN-3508.002.patch
|
| Optional Tests | javadoc javac unit findbugs checkstyle |
| git revision | trunk / da05361 |
| checkstyle |  https://builds.apache.org/job/PreCommit-YARN-Build/8145/artifact/patchprocess/diffcheckstylehadoop-yarn-server-resourcemanager.txt
|
| hadoop-yarn-server-resourcemanager test log | https://builds.apache.org/job/PreCommit-YARN-Build/8145/artifact/patchprocess/testrun_hadoop-yarn-server-resourcemanager.txt
|
| Test Results | https://builds.apache.org/job/PreCommit-YARN-Build/8145/testReport/ |
| Java | 1.7.0_55 |
| uname | Linux asf905.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/8145/console |


This message was automatically generated.

> Preemption processing occuring on the main RM dispatcher
> --------------------------------------------------------
>
>                 Key: YARN-3508
>                 URL: https://issues.apache.org/jira/browse/YARN-3508
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: resourcemanager, scheduler
>    Affects Versions: 2.6.0
>            Reporter: Jason Lowe
>            Assignee: Varun Saxena
>         Attachments: YARN-3508.002.patch, YARN-3508.01.patch
>
>
> We recently saw the RM for a large cluster lag far behind on the AsyncDispacher event
queue.  The AsyncDispatcher thread was consistently blocked on the highly-contended CapacityScheduler
lock trying to dispatch preemption-related events for RMContainerPreemptEventDispatcher. 
Preemption processing should occur on the scheduler event dispatcher thread or a separate
thread to avoid delaying the processing of other events in the primary dispatcher queue.



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