[HADOOP-4583] Code optimization/cleanup in HDFS

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.20.0
• Fix Version/s: 0.20.0
• Hadoop Flags: Reviewed
• Assignee: Suresh Srinivas
• Reporter: Suresh Srinivas
• Created: 04/Nov/08 00:39
• Updated: 08/Jul/09 16:43
• Resolved: 08/Nov/08 02:25

Description

Some of the changes needed:

• FSNameSystem.allocateBlock creates a lot of object unnecessarily to find a blockID that is unused. It should reuse the Block object created by changing the blockID and reusing the GenerationStamp.
• InodeFile.addBlock should use System.arrayCopy instead of copying 1 at a time.
• Some of the for loops in FSEditLog.java can be optimized. Instead of getting the edit stream length in termination condition, a local variable should be used to do the same.