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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-2340) optimize JobInProgress.initTasks()
Date Fri, 08 May 2015 19:17:03 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-2340?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14535315#comment-14535315
] 

Hadoop QA commented on MAPREDUCE-2340:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:red}-1{color} | pre-patch |   0m  4s | Unsupported build system. |
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|| Subsystem || Report/Notes ||
| Patch URL | http://issues.apache.org/jira/secure/attachment/12731521/MAPREDUCE-2340-branch-1.4.patch
|
| Optional Tests | javadoc javac unit findbugs checkstyle |
| git revision | branch-1 / 5f5138e |
| Console output | https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/5679/console |


This message was automatically generated.

> optimize JobInProgress.initTasks()
> ----------------------------------
>
>                 Key: MAPREDUCE-2340
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2340
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: jobtracker
>    Affects Versions: 0.20.1, 0.21.0
>            Reporter: Kang Xiao
>              Labels: BB2015-05-TBR, critical-0.22.0
>         Attachments: MAPREDUCE-2340-branch-1.4.patch, MAPREDUCE-2340.patch, MAPREDUCE-2340.patch,
MAPREDUCE-2340.r1.diff
>
>
> JobTracker's hostnameToNodeMap cache can speed up JobInProgress.initTasks() and JobInProgress.createCache()
significantly. A test for 1 job with 100000 maps on a 2400 cluster shows nearly 10 and 50
times speed up for initTasks() and createCache(). 



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