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Posted to common-dev@hadoop.apache.org by "Raghu Angadi (JIRA)" <ji...@apache.org> on 2008/08/14 00:10:44 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=12622368#action_12622368 ] 

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

I guess we missed converting this to use read lock as part of HADOOP-1269. Would that be the fix? 

> 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
>
>
> 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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