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Posted to common-issues@hadoop.apache.org by "Chris Nauroth (JIRA)" <ji...@apache.org> on 2016/09/19 22:29:20 UTC
[jira] [Comment Edited] (HADOOP-13169) Randomize file list in
SimpleCopyListing
[ https://issues.apache.org/jira/browse/HADOOP-13169?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15504883#comment-15504883 ]
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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