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https://issues.apache.org/jira/browse/YARN-3612?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14537236#comment-14537236
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Hadoop QA commented on YARN-3612:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | pre-patch | 14m 39s | 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 33s | There were no new javac warning
messages. |
| {color:green}+1{color} | javadoc | 9m 34s | 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 51s | The applied patch generated 3
new checkstyle issues (total was 43, now 41). |
| {color:green}+1{color} | whitespace | 0m 0s | The patch has no lines that
end in whitespace. |
| {color:green}+1{color} | install | 1m 37s | mvn install still works. |
| {color:green}+1{color} | eclipse:eclipse | 0m 33s | The patch built with
eclipse:eclipse. |
| {color:green}+1{color} | findbugs | 1m 24s | The patch does not introduce
any new Findbugs (version 2.0.3) warnings. |
| {color:green}+1{color} | yarn tests | 1m 57s | Tests passed in
hadoop-yarn-common. |
| | | 38m 34s | |
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|| Subsystem || Report/Notes ||
| Patch URL |
http://issues.apache.org/jira/secure/attachment/12731802/YARN-3612.01.patch |
| Optional Tests | javadoc javac unit findbugs checkstyle |
| git revision | trunk / 4536399 |
| checkstyle |
https://builds.apache.org/job/PreCommit-YARN-Build/7854/artifact/patchprocess/diffcheckstylehadoop-yarn-common.txt
|
| hadoop-yarn-common test log |
https://builds.apache.org/job/PreCommit-YARN-Build/7854/artifact/patchprocess/testrun_hadoop-yarn-common.txt
|
| Test Results |
https://builds.apache.org/job/PreCommit-YARN-Build/7854/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/7854/console |
This message was automatically generated.
> Resource calculation in child tasks is CPU-heavy
> ------------------------------------------------
>
> Key: YARN-3612
> URL: https://issues.apache.org/jira/browse/YARN-3612
> Project: Hadoop YARN
> Issue Type: Bug
> Affects Versions: 2.7.0
> Reporter: Todd Lipcon
> Labels: BB2015-05-RFC, performance
> Attachments: MAPREDUCE-4469.patch, MAPREDUCE-4469_rev2.patch,
> MAPREDUCE-4469_rev3.patch, MAPREDUCE-4469_rev4.patch,
> MAPREDUCE-4469_rev5.patch, YARN-3612.01.patch
>
>
> In doing some benchmarking on a hadoop-1 derived codebase, I noticed that
> each of the child tasks was doing a ton of syscalls. Upon stracing, I noticed
> that it's spending a lot of time looping through all the files in /proc to
> calculate resource usage.
> As a test, I added a flag to disable use of the ResourceCalculatorPlugin
> within the tasks. On a CPU-bound 500G-sort workload, this improved total job
> runtime by about 10% (map slot-seconds by 14%, reduce slot seconds by 8%)
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