[jira] [Created] (HDFS-13960) hdfs dfs -checksum command should optionally show block size in output

["Adam Antal (JIRA)" <ji...@apache.org>]

Adam Antal created HDFS-13960:
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             Summary: 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


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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