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https://issues.apache.org/jira/browse/HADOOP-11794?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15900237#comment-15900237
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Yongjun Zhang commented on HADOOP-11794:
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Thanks for being interested [~zshao],
Wonder if you would consider trying patch viewer
https://chrome.google.com/webstore/detail/git-patch-viewer/hkoggakcdopbgnaeeidcmopfekipkleg?hl=en-US
? It works nicely in browser, you click on the patch and it show the changes
made by the patch side by side.
When patch viewer is not sufficient, I usually review patch by applying the
patch and doing "git difftool" with a graphical viewer. I saw most folks upload
patches to jira and use this way to view.
Hope that helps,
> 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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