[jira] [Commented] (HADOOP-13169) Randomize file list in SimpleCopyListing

["Hadoop QA (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-13169?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15288518#comment-15288518 ] 

Hadoop QA commented on HADOOP-13169:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue} 0m 0s {color} | {color:blue} Docker mode activated. {color} |
| {color:red}-1{color} | {color:red} patch {color} | {color:red} 0m 7s {color} | {color:red} HADOOP-13169 does not apply to branch-2. Rebase required? Wrong Branch? See https://wiki.apache.org/hadoop/HowToContribute for help. {color} |
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|| Subsystem || Report/Notes ||
| JIRA Patch URL | https://issues.apache.org/jira/secure/attachment/12804580/HADOOP-13169-branch-2-001.patch |
| JIRA Issue | HADOOP-13169 |
| Console output | https://builds.apache.org/job/PreCommit-HADOOP-Build/9478/console |
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> 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
>            Priority: Minor
>         Attachments: HADOOP-13169-branch-2-001.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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