Improve block placement performance
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Key: HADOOP-5603
URL: https://issues.apache.org/jira/browse/HADOOP-5603
Project: Hadoop Core
Issue Type: Improvement
Components: dfs
Reporter: Hairong Kuang
Assignee: Hairong Kuang
Fix For: 0.21.0
ReplicationTargetChooser chooses targets by iteratively selecting random nodes
first and then filtering good targets until the required number of targets are
chosen. This code may require selecting random nodes multiple times, thus
introducing multiple traversals of the given portion of the cluster map. This
code can be improved by traversing the portion of the cluster map only once.
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