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