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