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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-5268) Improve history server startup performance
Date Fri, 31 May 2013 18:16:20 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-5268?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13671705#comment-13671705
] 

Hadoop QA commented on MAPREDUCE-5268:
--------------------------------------

{color:green}+1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12585646/mr-5268.patch
  against trunk revision .

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:green}+1 tests included{color}.  The patch appears to include 2 new or modified
test files.

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of
javac compiler warnings.

    {color:green}+1 javadoc{color}.  The javadoc tool did not generate any warning messages.

    {color:green}+1 eclipse:eclipse{color}.  The patch built with eclipse:eclipse.

    {color:green}+1 findbugs{color}.  The patch does not introduce any new Findbugs (version
1.3.9) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase the total number
of release audit warnings.

    {color:green}+1 core tests{color}.  The patch passed unit tests in hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-hs.

    {color:green}+1 contrib tests{color}.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/3711//testReport/
Console output: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/3711//console

This message is automatically generated.
                
> 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
>         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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