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Date: Tue, 28 Feb 2012 00:51:49 +0000 (UTC)
From: "Hudson (Commented) (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (MAPREDUCE-3901) lazy load JobHistory Task and
 TaskAttempt details
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    [ https://issues.apache.org/jira/browse/MAPREDUCE-3901?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13217760#comment-13217760 ] 

Hudson commented on MAPREDUCE-3901:
-----------------------------------

Integrated in Hadoop-Common-trunk-Commit #1789 (See [https://builds.apache.org/job/Hadoop-Common-trunk-Commit/1789/])
    MAPREDUCE-3901. Modified JobHistory records in YARN to lazily load job and task reports so as to improve UI response times. Contributed by Siddarth Seth. (Revision 1294417)

     Result = SUCCESS
vinodkv : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1294417
Files : 
* /hadoop/common/trunk/hadoop-mapreduce-project/CHANGES.txt
* /hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-common/src/main/java/org/apache/hadoop/mapreduce/v2/util/MRBuilderUtils.java
* /hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-hs/src/main/java/org/apache/hadoop/mapreduce/v2/hs/CompletedJob.java
* /hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-hs/src/main/java/org/apache/hadoop/mapreduce/v2/hs/CompletedTask.java
* /hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-hs/src/main/java/org/apache/hadoop/mapreduce/v2/hs/CompletedTaskAttempt.java
* /hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-hs/src/main/java/org/apache/hadoop/mapreduce/v2/hs/JobHistory.java
* /hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-hs/src/test/java/org/apache/hadoop/mapreduce/v2/hs/TestJobHistoryEntities.java
* /hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-hs/src/test/resources/job_1329348432655_0001-1329348443227-user-Sleep+job-1329348468601-10-1-SUCCEEDED-default.jhist
* /hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-hs/src/test/resources/job_1329348432655_0001_conf.xml

                
> lazy load JobHistory Task and TaskAttempt details
> -------------------------------------------------
>
>                 Key: MAPREDUCE-3901
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3901
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: jobhistoryserver, mrv2
>    Affects Versions: 0.23.0
>            Reporter: Siddharth Seth
>            Assignee: Siddharth Seth
>             Fix For: 0.23.2
>
>         Attachments: MR3901.txt, MR3901_v2.txt, MR3901_v3.txt
>
>
> The job history UI and MRClientProtocol calls routed via JobHistory are very slow for large jobs. Some of this time is spent parsing the history file. A good chunk is spent pre-creating lots of objects which may never be used. Those can be create when required - bringing down the load times of job history pages and getJobReport etc calls to approximately the history file parse time.

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