[HADOOP-3943] NetworkTopology.pseudoSortByDistance does not need to be a synchronized method

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.19.0
• Hadoop Flags: Reviewed
• Assignee: Hairong Kuang
• Reporter: Hairong Kuang
• Created: 13/Aug/08 00:06
• Updated: 08/Jul/09 16:43
• Resolved: 05/Sep/08 04:52

Description

When all requests to namenode are read, most handlers block on NetworkTopology object lock when sorting replicas. Removing this necessary lock would reduce the contention in namenode and therefore improve its throughput.