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https://issues.apache.org/jira/browse/HDFS-219?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12999099#comment-12999099
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Tsz Wo (Nicholas), SZE commented on HDFS-219:
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> I think it would be usefull to add md5sum ...
Computing a single md5 over a file (i.e. md5sum) is inefficient when the file
is large since the md5 algorithm cannot be executed in parallel. This is also
the reason that we have {{MD5MD5CRC32FileChecksum}} in HDFS.
> Add md5sum facility in dfsshell
> -------------------------------
>
> Key: HDFS-219
> URL: https://issues.apache.org/jira/browse/HDFS-219
> Project: Hadoop HDFS
> Issue Type: New Feature
> Reporter: zhangwei
>
> I think it would be usefull to add md5sum (or anyone else) to dfsshell ,and
> the facility can verify the file on hdfs.It can confirm the file is integrity
> after copyFromLocal or copyToLocal.
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