NetworkTopology.pseudoSortByDistance does not need to be a synchronized method
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Key: HADOOP-3943
URL: https://issues.apache.org/jira/browse/HADOOP-3943
Project: Hadoop Core
Issue Type: Improvement
Components: dfs
Reporter: Hairong Kuang
Assignee: Hairong Kuang
Fix For: 0.19.0
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.
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