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https://issues.apache.org/jira/browse/HADOOP-13169?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15496905#comment-15496905
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Chris Nauroth commented on HADOOP-13169:
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[~rajesh.balamohan], thanks for the update.  I think this is really close.

In addition to Steve's feedback, would you please switch one remaining instance 
of {{LinkedList}} to {{ArrayList}}?

After that, I'll put this through a full test run against multiple file 
systems, and then I expect we can commit.

> 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
>         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
>
>
> 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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