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https://issues.apache.org/jira/browse/HADOOP-5181?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12671061#action_12671061
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zhangwei commented on HADOOP-5181:
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Maybe I don't say clearly.
It's not relevant with the crc verify. It's a tool that help peple to see the
file's checksum on hdfs.
If people want to get the file's checksum ,he has to only download it to local
and run "md5sum".
In many cases,developer want to check a large set of mapred output files to
confirm the program in testing runs correctly,
and they can also differ the older and new version program's output to find out
the new program's tiny bug.
> 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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