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From "Rajesh Balamohan (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-13169) Randomize file list in SimpleCopyListing
Date Wed, 18 May 2016 04:24:12 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-13169?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Rajesh Balamohan updated HADOOP-13169:
    Attachment: HADOOP-13169-branch-2-001.patch

TestCopyListing covers this codepath. Encountered HADOOP-13170 when running unit tests; included
the trivial fix it.

> 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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