Kihwal Lee created HDFS-4090:
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Summary: 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: 2.0.2-alpha, 0.23.4
Reporter: Kihwal Lee
Priority: Critical
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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