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https://issues.apache.org/jira/browse/HADOOP-9209?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13554116#comment-13554116
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Colin Patrick McCabe commented on HADOOP-9209:
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{code}
+ "to the datanode storing each block of the file, and thus is not\n" +
{code}
Perhaps this should be "*a* datanode storing..." to avoid the implication that
there is only one place a block is stored.
I think it would be better to call this command {{\-dumpChecksums}}. Just
calling it "checksum" leaves it kind of ambiguous what it does (at least in my
mind). A command just called "checksum" could do many things-- like create a
new checksum for a file that didn't have one, checksum some data which wasn't
checksummed before, etc. "dump checksum" makes it clear that you're dumping
something that already exists.
> 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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