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Date: Fri, 31 Mar 2017 16:07:42 +0000 (UTC)
From: "Yongjun Zhang (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
Message-ID: <JIRA.12495281.1294770616000.177222.1490976462401@Atlassian.JIRA>
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Subject: [jira] [Commented] (HADOOP-11794) Enable distcp to copy blocks in
 parallel
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archived-at: Fri, 31 Mar 2017 16:07:49 -0000


    [ https://issues.apache.org/jira/browse/HADOOP-11794?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15951193#comment-15951193 ] 

Yongjun Zhang commented on HADOOP-11794:
----------------------------------------

Welcome [~omkarksa], I will be working on backporting to other branches asap. Do you have specific expectations?

Just to clarify, I did not mean not to consider supporting other file system, rather, I was suggesting working on that as a separate jira. Your help on the testing out ADLS, together with [~steve_l]'s suggestion about checking concat support (UnsupportedException) made it easier for us to relax the file system constraint in this jira. So thank you guys again!

BTW, Steve still has an item for you to follow-up here:-)

https://issues.apache.org/jira/browse/HADOOP-11794?focusedCommentId=15938217&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-15938217

Thanks.


> Enable distcp to copy blocks in parallel
> ----------------------------------------
>
>                 Key: HADOOP-11794
>                 URL: https://issues.apache.org/jira/browse/HADOOP-11794
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: tools/distcp
>    Affects Versions: 0.21.0
>            Reporter: dhruba borthakur
>            Assignee: Yongjun Zhang
>         Attachments: HADOOP-11794.001.patch, HADOOP-11794.002.patch, HADOOP-11794.003.patch, HADOOP-11794.004.patch, HADOOP-11794.005.patch, HADOOP-11794.006.patch, HADOOP-11794.007.patch, HADOOP-11794.008.patch, HADOOP-11794.009.patch, HADOOP-11794.010.patch, MAPREDUCE-2257.patch
>
>
> The minimum unit of work for a distcp task is a file. We have files that are greater than 1 TB with a block size of  1 GB. If we use distcp to copy these files, the tasks either take a long long long time or finally fails. A better way for distcp would be to copy all the source blocks in parallel, and then stich the blocks back to files at the destination via the HDFS Concat API (HDFS-222)


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