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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-5239) Allow FSNamesystem lock fairness to be configurable
Date Tue, 24 Sep 2013 10:58:13 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5239?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13776195#comment-13776195

Hudson commented on HDFS-5239:

SUCCESS: Integrated in Hadoop-Yarn-trunk #342 (See [https://builds.apache.org/job/Hadoop-Yarn-trunk/342/])
HDFS-5239.  Allow FSNamesystem lock fairness to be configurable (daryn) (daryn: http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1525624)
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestFSNamesystem.java

> 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
>             Fix For: 3.0.0, 2.3.0
>         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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