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https://issues.apache.org/jira/browse/HDFS-4090?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13483178#comment-13483178
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Hudson commented on HDFS-4090:
------------------------------
Integrated in Hadoop-Hdfs-0.23-Build #414 (See
[https://builds.apache.org/job/Hadoop-Hdfs-0.23-Build/414/])
svn merge -c 1401309 FIXES: HDFS-4090. getFileChecksum() result
incompatible when called against zero-byte files. (Kihwal Lee via daryn)
(Revision 1401322)
Result = SUCCESS
daryn : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1401322
Files :
*
/hadoop/common/branches/branch-0.23/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
*
/hadoop/common/branches/branch-0.23/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSClient.java
*
/hadoop/common/branches/branch-0.23/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDistributedFileSystem.java
> 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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