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https://issues.apache.org/jira/browse/MAPREDUCE-6473?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14907404#comment-14907404
 ] 

Hadoop QA commented on MAPREDUCE-6473:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | pre-patch |  17m  8s | Pre-patch trunk compilation is 
healthy. |
| {color:green}+1{color} | @author |   0m  0s | The patch does not contain any 
@author tags. |
| {color:red}-1{color} | tests included |   0m  0s | The patch doesn't appear 
to include any new or modified tests.  Please justify why no new tests are 
needed for this patch. Also please list what manual steps were performed to 
verify this patch. |
| {color:green}+1{color} | javac |   8m  2s | There were no new javac warning 
messages. |
| {color:green}+1{color} | javadoc |  10m 22s | There were no new javadoc 
warning messages. |
| {color:green}+1{color} | release audit |   0m 24s | The applied patch does 
not increase the total number of release audit warnings. |
| {color:green}+1{color} | checkstyle |   0m 38s | There were no new checkstyle 
issues. |
| {color:green}+1{color} | whitespace |   0m  0s | The patch has no lines that 
end in whitespace. |
| {color:green}+1{color} | install |   1m 30s | mvn install still works. |
| {color:green}+1{color} | eclipse:eclipse |   0m 34s | 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} | mapreduce tests |   1m 48s | Tests passed in 
hadoop-mapreduce-client-core. |
| | |  41m 55s | |
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|| Subsystem || Report/Notes ||
| Patch URL | 
http://issues.apache.org/jira/secure/attachment/12762269/MAPREDUCE-6473-v6.patch
 |
| Optional Tests | javadoc javac unit findbugs checkstyle |
| git revision | trunk / d1b9b85 |
| hadoop-mapreduce-client-core test log | 
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/6017/artifact/patchprocess/testrun_hadoop-mapreduce-client-core.txt
 |
| Test Results | 
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/6017/testReport/ |
| Java | 1.7.0_55 |
| uname | Linux asf904.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-MAPREDUCE-Build/6017/console |


This message was automatically generated.

> Job submission can take a long time during Cluster initialization
> -----------------------------------------------------------------
>
>                 Key: MAPREDUCE-6473
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-6473
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: performance
>            Reporter: Kuhu Shukla
>            Assignee: Kuhu Shukla
>         Attachments: 99%ile.png, MAPREDUCE-6473-PerfTest.txt, 
> MAPREDUCE-6473-v1.patch, MAPREDUCE-6473-v2.patch, MAPREDUCE-6473-v3.patch, 
> MAPREDUCE-6473-v4.patch, MAPREDUCE-6473-v5.patch, MAPREDUCE-6473-v6.patch, 
> avgtime.png
>
>
> During initialization in Cluster.java, the framework provider classes are 
> loaded inside a sync block which can considerably increase job submission 
> time when the number of submissions are high. The motive is to reduce time 
> spent in this sync block safely to improve performance.
> {noformat}
> synchronized (frameworkLoader) {
>       for (ClientProtocolProvider provider : frameworkLoader) {
>         LOG.debug("Trying ClientProtocolProvider : "
>             + provider.getClass().getName());
> {noformat}



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