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https://issues.apache.org/jira/browse/HADOOP-11794?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15936826#comment-15936826
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Omkar Aradhya K S commented on HADOOP-11794:
--------------------------------------------
Thanks [~steve_l], [~jzhuge],
Yes, this could be one way to do it. Let me see if there is any other way.
{quote}
There is always the option of doing that: sending in an invalid concat()
request and differentiating between: UnsupportedException and any other
response, then assuming that the "any other response" exception means that it
is implemented, but that the arguments were invalid. concat("/", new Path[0])
should be enough.
{quote}
That's right ADLS supports both *concat* and *getFileBlockLocations* and as
commented before in this JIRA, I was able to get this patch working with ADLS
with these changes and one more change.
> 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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