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Class org.apache.hadoop.hdfs.server.protocol.DatanodeCommand

The superclass changed from java.lang.Object to org.apache.hadoop.hdfs.server.protocol.ServerCommand.
Removed interface org.apache.hadoop.io.Writable.

Changed Methods
int getAction() Method was locally defined, but is now inherited from ServerCommand. Get server command action.
void readFields(DataInput) Method was locally defined, but is now inherited from ServerCommand.  
void write(DataOutput) Method was locally defined, but is now inherited from ServerCommand.