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Date: Tue, 6 Mar 2012 18:26:57 +0000 (UTC)
From: "Hadoop QA (Commented) (JIRA)" <jira@apache.org>
To: mapreduce-issues@hadoop.apache.org
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Subject: [jira] [Commented] (MAPREDUCE-3944) JobHistory web services are
 slower then the UI and can easly overload the JH
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    [ https://issues.apache.org/jira/browse/MAPREDUCE-3944?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13223508#comment-13223508 ] 

Hadoop QA commented on MAPREDUCE-3944:
--------------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12517259/MR-3944.txt
  against trunk revision .

    +1 @author.  The patch does not contain any @author tags.

    +1 tests included.  The patch appears to include 11 new or modified tests.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

    +1 eclipse:eclipse.  The patch built with eclipse:eclipse.

    +1 findbugs.  The patch does not introduce any new Findbugs (version 1.3.9) warnings.

    +1 release audit.  The applied patch does not increase the total number of release audit warnings.

    -1 core tests.  The patch failed these unit tests:
                  org.apache.hadoop.mapred.TestJobClientGetJob
                  org.apache.hadoop.mapred.TestMRWithDistributedCache
                  org.apache.hadoop.mapred.TestLocalModeWithNewApis

    +1 contrib tests.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/2012//testReport/
Console output: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/2012//console

This message is automatically generated.
                
> JobHistory web services are slower then the UI and can easly overload the JH
> ----------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-3944
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3944
>             Project: Hadoop Map/Reduce
>          Issue Type: Sub-task
>          Components: mrv2
>    Affects Versions: 0.23.1, 0.23.2
>            Reporter: Robert Joseph Evans
>            Assignee: Robert Joseph Evans
>            Priority: Blocker
>         Attachments: MR-3944.txt, MR-3944.txt
>
>
> When our first customer started using the Job History web services today the History Server ground to a halt.  We found 250 Jetty threads stuck on the following stack trace.
> {noformat}
>    java.lang.Thread.State: BLOCKED (on object monitor)
>         at org.apache.hadoop.mapreduce.v2.hs.JobHistory.getJob(JobHistory.java:898)
>         - waiting to lock <0x00002aaab364ba60> (a org.apache.hadoop.mapreduce.v2.hs.JobHistory)
>         at org.apache.hadoop.mapreduce.v2.hs.webapp.HsWebServices.getJobs(HsWebServices.java:188)
> {noformat}
> HsWebServices.java:188 corresponds to the /mapreduce/jobs service.
> Looking at the code there are a number of optimizations that need to be done to improve its performance.

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