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From "Adam Antal (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-13960) hdfs dfs -checksum command should optionally show block size in output
Date Tue, 30 Oct 2018 09:23:01 GMT

    [ https://issues.apache.org/jira/browse/HDFS-13960?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16668406#comment-16668406
] 

Adam Antal commented on HDFS-13960:
-----------------------------------

Great, thanks! Its a low prio issue, so it's not urgent, just checked in.

> 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
>
> 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 itĀ 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 sizeĀ 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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