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https://issues.apache.org/jira/browse/HADOOP-3943?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12628064#action_12628064
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Raghu Angadi commented on HADOOP-3943:
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That keeps it "as correct as before", which is fine. +1
> NetworkTopology.pseudoSortByDistance does not need to be a synchronized method
> ------------------------------------------------------------------------------
>
> 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
>
> Attachments: sortDistance.patch
>
>
> 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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