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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3697) Enable fadvise readahead by default
Date Tue, 24 Jul 2012 14:04:36 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3697?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13421430#comment-13421430
] 

Hudson commented on HDFS-3697:
------------------------------

Integrated in Hadoop-Mapreduce-trunk #1146 (See [https://builds.apache.org/job/Hadoop-Mapreduce-trunk/1146/])
    HDFS-3697. Enable fadvise readahead by default. Contributed by Todd Lipcon. (Revision
1364698)

     Result = FAILURE
todd : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1364698
Files : 
* /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/DFSConfigKeys.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml

                
> Enable fadvise readahead by default
> -----------------------------------
>
>                 Key: HDFS-3697
>                 URL: https://issues.apache.org/jira/browse/HDFS-3697
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: data-node, performance
>    Affects Versions: 3.0.0, 2.2.0-alpha
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>            Priority: Minor
>             Fix For: 3.0.0, 2.2.0-alpha
>
>         Attachments: hdfs-3697-branch-1.txt, hdfs-3697.txt, hdfs-3697.txt
>
>
> The fadvise features have been implemented for some time, and we've enabled them in production
at a lot of customer sites without difficulty. I'd like to enable the readahead feature by
default in future versions so that users get this benefit without any manual configuration
required.
> The other fadvise features seem to be more workload-dependent and need further testing
before enabling by default.

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