chenping created HDFS-6066:
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Summary: logGenerationStamp is not needed to reduce editlog size
Key: HDFS-6066
URL: https://issues.apache.org/jira/browse/HDFS-6066
Project: Hadoop HDFS
Issue Type: Improvement
Components: namenode
Reporter: chenping
Priority: Minor
almost every logGenerationStamp has a logAddBlock too, so we can get the newest
gs from the logAddBlock operation indirectly.this will reduce the edit log size.
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