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From "Daryn Sharp (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-4090) getFileChecksum() result incompatible when called against zero-byte files.
Date Tue, 23 Oct 2012 15:39:12 GMT

     [ https://issues.apache.org/jira/browse/HDFS-4090?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Daryn Sharp updated HDFS-4090:
------------------------------

       Resolution: Fixed
    Fix Version/s: 0.23.5
                   2.0.3-alpha
                   3.0.0
     Hadoop Flags: Reviewed
           Status: Resolved  (was: Patch Available)

I've committed to trunk, branch-2, branch-23.  Thanks Kihwal!
                
> getFileChecksum() result incompatible when called against zero-byte files.
> --------------------------------------------------------------------------
>
>                 Key: HDFS-4090
>                 URL: https://issues.apache.org/jira/browse/HDFS-4090
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: hdfs client
>    Affects Versions: 0.23.4, 2.0.2-alpha
>            Reporter: Kihwal Lee
>            Assignee: Kihwal Lee
>            Priority: Critical
>             Fix For: 3.0.0, 2.0.3-alpha, 0.23.5
>
>         Attachments: hdfs-4090.patch
>
>
> When getFileChecksum() is called against a zero-byte file, the branch-1 client returns
MD5MD5CRC32FileChecksum with crcPerBlock=0, bytePerCrc=0 and md5=70bc8f4b72a86921468bf8e8441dce51,
whereas a null is returned in trunk.
> The null makes sense since there is no actual block checksums, but this breaks the compatibility
when doing distCp and calling getFileChecksum() via webhdfs or hftp.
> This JIRA is to make the client to return the same 'magic' value that the branch-1 and
earlier clients return.

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