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Date: Thu, 26 Jan 2012 10:29:41 +0000 (UTC)
From: "Hudson (Commented) (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HADOOP-6490) Path.normalize should use
 StringUtils.replace in favor of String.replace
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    [ https://issues.apache.org/jira/browse/HADOOP-6490?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13193733#comment-13193733 ] 

Hudson commented on HADOOP-6490:
--------------------------------

Integrated in Hadoop-Mapreduce-trunk-Commit #1608 (See [https://builds.apache.org/job/Hadoop-Mapreduce-trunk-Commit/1608/])
    merge HADOOP-4515 HADOOP-6490 HADOOP-7574 HADOOP-7736 HADOOP-7919 to 0.23 from trunk and update CHANGES.txt file accordingly.

harsh : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1236125
Files : 
* /hadoop/common/trunk/hadoop-common-project/hadoop-common/CHANGES.txt

                
> Path.normalize should use StringUtils.replace in favor of String.replace
> ------------------------------------------------------------------------
>
>                 Key: HADOOP-6490
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6490
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: fs
>    Affects Versions: 0.20.1
>            Reporter: Zheng Shao
>            Assignee: Uma Maheswara Rao G
>            Priority: Minor
>              Labels: newbie
>             Fix For: 0.23.1
>
>         Attachments: HADOOP-6490.patch
>
>
> in our environment, we are seeing that the JobClient is going out of memory because Path.normalizePath(String) is called several tens of thousands of times, and each time it calls "String.replace" twice.
> java.lang.String.replace compiles a regex to do the job which is very costly.
> We should use org.apache.commons.lang.StringUtils.replace which is much faster and consumes almost no extra memory.

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