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From "Yongjun Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-11794) distcp can copy blocks in parallel
Date Tue, 07 Mar 2017 21:50:38 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-11794?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15900237#comment-15900237
] 

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

Thanks for being interested [~zshao], 

Wonder if you would consider trying patch viewer https://chrome.google.com/webstore/detail/git-patch-viewer/hkoggakcdopbgnaeeidcmopfekipkleg?hl=en-US
? It works nicely in browser, you click on the patch and it show the changes made by the patch
side by side.

When patch viewer is not sufficient, I usually review patch by applying the patch and doing
"git difftool" with a graphical viewer. I saw most folks upload patches to jira and use this
way to view. 

Hope that helps, 


> distcp can 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, 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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