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Date: Wed, 3 Sep 2008 10:25:44 -0700 (PDT)
From: "Raghu Angadi (JIRA)" <jira@apache.org>
To: core-dev@hadoop.apache.org
Subject: [jira] Commented: (HADOOP-3943)
 NetworkTopology.pseudoSortByDistance does not need to be a synchronized
 method
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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 ] 

Raghu Angadi commented on HADOOP-3943:
--------------------------------------

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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