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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-5239) Allow FSNamesystem lock fairness to be configurable
Date Sat, 21 Sep 2013 00:56:52 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5239?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13773646#comment-13773646

Todd Lipcon commented on HDFS-5239:

> Allow FSNamesystem lock fairness to be configurable
> ---------------------------------------------------
>                 Key: HDFS-5239
>                 URL: https://issues.apache.org/jira/browse/HDFS-5239
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: namenode
>    Affects Versions: 2.0.0-alpha, 3.0.0
>            Reporter: Daryn Sharp
>            Assignee: Daryn Sharp
>         Attachments: HDFS-5239.patch
> The fairness of the {{FSNamesystem#fsLock}} is hardcoded to {{true}}.  Using an unfair
lock provides a negligible increase to throughput.  However this is due to bottlenecks elsewhere
in the system. In combination with other changes, such as RPC layer and audit logging, preliminary
tests show up to a 5X improvement for a read heavy workload.

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