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https://issues.apache.org/jira/browse/HADOOP-9209?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13554300#comment-13554300
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Todd Lipcon commented on HADOOP-9209:
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[~kihwal], that's a good point. Maybe it's better to not include this as a
shell command, but instead just have it be an undocumented 'tool' accessible by
something like 'hadoop org.apache.hadoop.tools.ChecksumFile' or something?
Putting it in the Shell hierarchy is nice because we get argument parsing for
free, etc, but maybe it's unnecessary.
To play devil's advocate, though, we do expose FileSystem.getFileChecksum() as
a public API, so it seems like offering CLI access to the same API is
equivalent.
> Add shell command to dump file checksums
> ----------------------------------------
>
> Key: HADOOP-9209
> URL: https://issues.apache.org/jira/browse/HADOOP-9209
> Project: Hadoop Common
> Issue Type: New Feature
> Components: fs, tools
> Affects Versions: 3.0.0, 2.0.3-alpha
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Attachments: hadoop-9209.txt, hadoop-9209.txt
>
>
> Occasionally while working with tools like distcp, or debugging certain
> issues, it's useful to be able to quickly see the checksum of a file. We
> currently have the APIs to efficiently calculate a checksum, but we don't
> expose it to users. This JIRA is to add a "fs -checksum" command which dumps
> the checksum information for the specified file(s).
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