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Posted to common-dev@hadoop.apache.org by "dhruba borthakur (JIRA)" <ji...@apache.org> on 2008/09/03 19:09:44 UTC

[jira] Commented: (HADOOP-3943) NetworkTopology.pseudoSortByDistance does not need to be a synchronized method

    [ https://issues.apache.org/jira/browse/HADOOP-3943?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12628059#action_12628059 ] 

dhruba borthakur commented on HADOOP-3943:
------------------------------------------

+1. Looks perfect to me.

> 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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