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Date: Tue, 29 Mar 2011 23:32:05 +0000 (UTC)
From: "Aaron T. Myers (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HDFS-1796) Switch NameNode to use non-fair
 locks
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    [ https://issues.apache.org/jira/browse/HDFS-1796?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13012774#comment-13012774 ] 

Aaron T. Myers commented on HDFS-1796:
--------------------------------------

Hi Hairong, can you post the details of your experiment? What was done and what results did you achieve?

> Switch NameNode to use non-fair locks
> -------------------------------------
>
>                 Key: HDFS-1796
>                 URL: https://issues.apache.org/jira/browse/HDFS-1796
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Hairong Kuang
>         Attachments: non-fair-lock.patch
>
>
> According to JavaDoc, a non-fair lock will normally have higher throughput than a fair lock. Our experiment also shows an improved performance when using a non-fair lock. We should switch namenode to use non-fair locks.

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