[HDFS-1061] Memory footprint optimization for INodeFile object.

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 0.22.0
• Fix Version/s: 0.22.0
• Component/s: namenode
• Hadoop Flags: Incompatible change, Reviewed
• Assignee: Bharath Mundlapudi
• Reporter: Bharath Mundlapudi
• Created: 22/Mar/10 22:39
• Updated: 02/Jun/10 21:49
• Resolved: 11/May/10 18:17

Description

I am proposing a footprint optimization to merge blockReplication and preferredBlockSize fields into one 'long header' field in INodeFile class. This saves 8 bytes per INodeFile object on a 64 bit JVM. This memory optimization is transparent and changes are very minimal.