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From "Yongjun Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-11794) distcp can copy blocks in parallel
Date Wed, 22 Mar 2017 20:01:42 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-11794?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15937018#comment-15937018
] 

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

Hi [~omkarksa], [~steve_l] [~jzhuge],

Thanks for the good discussion here. All are very good comments!

I personally prefer a step by step approach, this jira can be a foundation to add new additional
support and improvement, such as webhdfs, ADLs. It's easier to manage that way. The new jira
will not only include the code change (even if it's minimum), but also some unit tests. 

Omkar, what about we create a follow-up jira for ADLs, and we work together on the jira after
this jira is in?

Steve, I will also create a follow-up jira for webhdfs.

Thanks.





> 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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