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https://issues.apache.org/jira/browse/HADOOP-11794?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15937918#comment-15937918
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Omkar Aradhya K S commented on HADOOP-11794:
--------------------------------------------
[~yzhangal] Thanks for reconsidering the comments and making the required
changes for FlieSystem compatibility.
[~steve_l], [~jzhuge], [~atm], [~chris.douglas] Thanks for providing clarity
and a way ahead.
{quote}
Omkar Aradhya K S, can you post your patch?
{quote}
I made only the following changes in my patch to get it working with ADLS on
hadoop 2.7:
# Remove all the checks for *DistributedFileSystem*
# Use {code}fs.concat{code} instead of {code}dstdistfs.concat{code}
# Use {code}fs.getFileBlockLocations{code} instead of
{code}dfs.getBlockLocations{code}
# Use (now deprecated) {code}final DFSClient dfs = new DFSClient(conf);{code}
instead of {code}final DFSClient dfs = new
DFSClient(DFSUtilClient.getNNAddress(conf), conf);{code}
[~yzhangal] Once the new patch with all above changes is checked in, we need to
back port it to older versions of hadoop, which will be addressed by new JIRAs?
> 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,
> HADOOP-11794.009.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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