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https://issues.apache.org/jira/browse/HADOOP-13169?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15504883#comment-15504883
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Chris Nauroth edited comment on HADOOP-13169 at 9/19/16 10:29 PM:
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+1 for patch 010.  I verified that {{TestAzureNativeContractDistCp}} and 
{{ITestS3AContractDistCp}} are passing.  Rajesh, thank you for the patch.  
Steve, thank you for the code review.

I have committed this to trunk, branch-2 and branch-2.8.


was (Author: cnauroth):
+1 for patch 010.  I verified that {{TestAzureNativeContractDistCp}} and 
{{ITestS3AContractDistCp}} are passing.  Rajesh, thank you for the patch.  
Steve, thank you for the code review.

> Randomize file list in SimpleCopyListing
> ----------------------------------------
>
>                 Key: HADOOP-13169
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13169
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: tools/distcp
>            Reporter: Rajesh Balamohan
>            Assignee: Rajesh Balamohan
>            Priority: Minor
>             Fix For: 2.8.0
>
>         Attachments: HADOOP-13169-branch-2-001.patch, 
> HADOOP-13169-branch-2-002.patch, HADOOP-13169-branch-2-003.patch, 
> HADOOP-13169-branch-2-004.patch, HADOOP-13169-branch-2-005.patch, 
> HADOOP-13169-branch-2-006.patch, HADOOP-13169-branch-2-007.patch, 
> HADOOP-13169-branch-2-008.patch, HADOOP-13169-branch-2-009.patch, 
> HADOOP-13169-branch-2-010.patch
>
>
> When copying files to S3, based on file listing some mappers can get into S3 
> partition hotspots. This would be more visible, when data is copied from hive 
> warehouse with lots of partitions (e.g date partitions). In such cases, some 
> of the tasks would tend to be a lot more slower than others. It would be good 
> to randomize the file paths which are written out in SimpleCopyListing to 
> avoid this issue.



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