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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4339) Improve FsShell -du/-dus and FileSystem.getContentSummary efficiency
Date Fri, 07 Nov 2008 17:22:47 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4339?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12645827#action_12645827
] 

Hadoop QA commented on HADOOP-4339:
-----------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12392279/hadoop-fsshell-du-simple.patch
  against trunk revision 712102.

    +1 @author.  The patch does not contain any @author tags.

    -1 tests included.  The patch doesn't appear to include any new or modified tests.
                        Please justify why no tests are needed for this patch.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

    +1 findbugs.  The patch does not introduce any new Findbugs warnings.

    +1 Eclipse classpath. The patch retains Eclipse classpath integrity.

    +1 core tests.  The patch passed core unit tests.

    +1 contrib tests.  The patch passed contrib unit tests.

Test results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/3549/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/3549/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/3549/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/3549/console

This message is automatically generated.

> Improve FsShell -du/-dus and FileSystem.getContentSummary efficiency
> --------------------------------------------------------------------
>
>                 Key: HADOOP-4339
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4339
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: fs
>    Affects Versions: 0.18.1
>            Reporter: David Phillips
>         Attachments: hadoop-fsshell-du-simple.patch
>
>
> FsShell.du has two inefficiencies:
> * calling getContentSummary twice for each top-level item rather than calling it once
and saving the result
> * calling getContentSummary for files rather than using the size it already has in FileStatus
> getContentSummary has one:
> * calling itself for files rather than using the length it already has in FileStatus
> Every call to getContentSummary results in a call to getFileStatus, which may be expensive
(e.g. NativeS3FileSystem has both network latency and actual monetary cost).
> The simple solution:
> * FsShell.du calls once per item and saves the ContentSummary
> * FsShell.du uses FileStatus.getLen for files
> * getContentSummary only calls itself for directories
> Another solution, rather than adding special casing to callers, is to add a getContentSummary
that takes a FileStatus.

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