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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-5268) Improve history server startup performance
Date Tue, 04 Jun 2013 13:05:41 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-5268?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13674351#comment-13674351
] 

Hudson commented on MAPREDUCE-5268:
-----------------------------------

Integrated in Hadoop-Hdfs-trunk #1420 (See [https://builds.apache.org/job/Hadoop-Hdfs-trunk/1420/])
    MAPREDUCE-5268. Improve history server startup performance. Contributed by Karthik Kambatla
(Revision 1489012)

     Result = FAILURE
jlowe : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1489012
Files : 
* /hadoop/common/trunk/hadoop-mapreduce-project/CHANGES.txt
* /hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-hs/src/main/java/org/apache/hadoop/mapreduce/v2/hs/HistoryFileManager.java
* /hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-hs/src/test/java/org/apache/hadoop/mapreduce/v2/hs/TestJobIdHistoryFileInfoMap.java
* /hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-hs/src/test/java/org/apache/hadoop/mapreduce/v2/hs/TestJobListCache.java

                
> Improve history server startup performance
> ------------------------------------------
>
>                 Key: MAPREDUCE-5268
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5268
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: jobhistoryserver
>    Affects Versions: 0.23.7, 2.0.4-alpha
>            Reporter: Jason Lowe
>            Assignee: Karthik Kambatla
>             Fix For: 2.1.0-beta, 0.23.9
>
>         Attachments: mr-5268.patch, mr-5268.patch, mr-5268.patch, mr-5268.patch, mr-5268.patch,
mr-5268-prelim.patch
>
>
> The history server can easily take many minutes to startup when there are a significant
number of jobs to scan in the done directory.  However the scanning of files is not the bottleneck,
rather it's the heavy use of ConcurrentSkipListMap.size in HistoryFileManager.  
> ConcurrentSkipListMap.size is a very expensive operation, especially on maps with many
entries, as it has to scan every entry to compute the size.  We should avoid calling this
method or at least minimize its use.

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