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https://issues.apache.org/jira/browse/HDFS-13960?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Lokesh Jain updated HDFS-13960:
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Attachment: HDFS-13960.003.patch
> hdfs dfs -checksum command should optionally show block size in output
> ----------------------------------------------------------------------
>
> Key: HDFS-13960
> URL: https://issues.apache.org/jira/browse/HDFS-13960
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs
> Reporter: Adam Antal
> Assignee: Lokesh Jain
> Priority: Minor
> Attachments: HDFS-13960.001.patch, HDFS-13960.002.patch,
> HDFS-13960.003.patch
>
>
> The hdfs checksum command computes the checksum in a distributed manner,
> which would take into account the block size. In other words, the block size
> determines how the file will be broken up.
> Therefore it can happen that the checksum command produces different outputs
> for the exact same file only differing in the block size:
> checksum(fileABlock1) + checksum(fileABlock2) != checksum(fileABlock1 +
> fileABlock2)
> I suggest to add an option to the hdfs dfs -checksum command which would
> displays the block size along with the output, and that could also be helpful
> in some other cases where this piece of information is needed.
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