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Posted to hdfs-dev@hadoop.apache.org by "Kihwal Lee (JIRA)" <ji...@apache.org> on 2012/10/19 23:30:13 UTC

[jira] [Created] (HDFS-4090) getFileChecksum() result incompatible when called against zero-byte files.

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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