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Class org.apache.hadoop.hdfs.server.common.GenerationStamp

Removed interface org.apache.hadoop.io.WritableComparable.
Added interface java.lang.Comparable.

Removed Methods
int compare(long, long)  
boolean equalsWithWildcard(long, long)  
void readFields(DataInput)  
void write(DataOutput)  
 

Removed Fields
long WILDCARD_STAMP  
 

Added Fields
long GRANDFATHER_GENERATION_STAMP Generation stamp of blocks that pre-date the introduction of a generation stamp.