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https://issues.apache.org/jira/browse/HADOOP-9209?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13561757#comment-13561757
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Kihwal Lee commented on HADOOP-9209:
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bq. I hesitate to add implementation details, or refs to javadocs in the shell
output. Would it suffice for the help output to say "This is an inefficient
operation"?
The intention is to let users know what to expect. The issue is not about its
efficiency, but its behavior, which may surprise users who are use to various
checksum/digest commands. We can probably briefly mention that the checksum
depends on the block size in addition to the content.
> 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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