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https://issues.apache.org/jira/browse/HADOOP-5181?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12671038#action_12671038
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dhruba borthakur commented on HADOOP-5181:
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dfsshell uses the dfs client, which in turn, verifies that the crc's match the
data of the file that is being fetched. There is a crc for every 512 bytes in
the file. So, I am not sure what additional verification is achieved by
incorporating md5 in dfsshell.
> Add md5sum facility in dfsshell
> -------------------------------
>
> Key: HADOOP-5181
> URL: https://issues.apache.org/jira/browse/HADOOP-5181
> Project: Hadoop Core
> Issue Type: New Feature
> Components: dfs
> 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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