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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3697) Enable fadvise readahead by default
Date Mon, 23 Jul 2012 16:43:36 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3697?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13420768#comment-13420768
] 

Hadoop QA commented on HDFS-3697:
---------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12537579/hdfs-3697-branch-1.txt
  against trunk revision .

    -1 patch.  The patch command could not apply the patch.

Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/2887//console

This message is automatically generated.
                
> 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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