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https://issues.apache.org/jira/browse/MAPREDUCE-1305?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12791855#action_12791855
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Hadoop QA commented on MAPREDUCE-1305:
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-1 overall. Here are the results of testing the latest attachment
http://issues.apache.org/jira/secure/attachment/12428234/MAPRED-1305.patch
against trunk revision 891524.
+1 @author. The patch does not contain any @author tags.
+1 tests included. The patch appears to include 3 new or modified tests.
-1 patch. The patch command could not apply the patch.
Console output:
http://hudson.zones.apache.org/hudson/job/Mapreduce-Patch-h3.grid.sp2.yahoo.net/208/console
This message is automatically generated.
> Massive performance problem with DistCp and -delete
> ---------------------------------------------------
>
> Key: MAPREDUCE-1305
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1305
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: distcp
> Affects Versions: 0.20.1
> Reporter: Peter Romianowski
> Assignee: Peter Romianowski
> Attachments: MAPRED-1305.patch
>
>
> *First problem*
> In org.apache.hadoop.tools.DistCp#deleteNonexisting we serialize FileStatus
> objects when the path is all we need.
> The performance problem comes from
> org.apache.hadoop.fs.RawLocalFileSystem.RawLocalFileStatus#write which tries
> to retrieve file permissions by issuing a "ls -ld <path>" which is painfully
> slow.
> Changed that to just serialize Path and not FileStatus.
> *Second problem*
> To delete the files we invoke the "hadoop" command line tool with option
> "-rmr <path>". Again, for each file.
> Changed that to dstfs.delete(path, true)
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