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https://issues.apache.org/jira/browse/HDFS-4090?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13482361#comment-13482361
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Daryn Sharp commented on HDFS-4090:
-----------------------------------
+1 Will commit shortly.
> 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
> 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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