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From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-5603) Improve block placement performance
Date Tue, 31 Mar 2009 21:18:51 GMT
Improve block placement performance
-----------------------------------

                 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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