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https://issues.apache.org/jira/browse/HDFS-13960?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16808088#comment-16808088
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Hudson commented on HDFS-13960:
-------------------------------
SUCCESS: Integrated in Jenkins build Hadoop-trunk-Commit #16329 (See
[https://builds.apache.org/job/Hadoop-trunk-Commit/16329/])
HDFS-13960. hdfs dfs -checksum command should optionally show block size
(weichiu: rev cf268114c9af2e33f35d0c24b57e31ef4d5e8353)
* (edit)
hadoop-common-project/hadoop-common/src/site/markdown/FileSystemShell.md
* (edit) hadoop-common-project/hadoop-common/src/test/resources/testConf.xml
* (edit)
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDFSShell.java
* (edit)
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/shell/Display.java
> 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
> Fix For: 3.3.0
>
> 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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