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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-13169) Randomize file list in SimpleCopyListing
Date Wed, 18 May 2016 06:38:12 GMT

    [ 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
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| JIRA Issue | HADOOP-13169 |
| Console output | https://builds.apache.org/job/PreCommit-HADOOP-Build/9478/console |
| Powered by | Apache Yetus 0.3.0-SNAPSHOT   http://yetus.apache.org |


This message was automatically generated.



> 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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