Allow DFSClient to find out and use the CRC type being used for a file.
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Key: HDFS-3177
URL: https://issues.apache.org/jira/browse/HDFS-3177
Project: Hadoop HDFS
Issue Type: Bug
Components: data-node, hdfs client
Affects Versions: 0.23.0
Reporter: Kihwal Lee
Assignee: Kihwal Lee
Fix For: 0.23.3, 2.0.0, 3.0.0
To support HADOOP-8060, DFSClient should be able to find out the checksum type
being used for files in hdfs.
In my prototype, DataTransferProtocol was extended to include the checksum type
in the blockChecksum() response. DFSClient uses it in getFileChecksum() to
determin the checksum type. Also append() can be configured to use the existing
checksum type instead of the configured one.
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