[jira] [Updated] (HDFS-3697) Enable fadvise readahead by default

["Eli Collins (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-3697?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Eli Collins updated HDFS-3697:
------------------------------

    Target Version/s:   (was: 1.2.0, 3.0.0, 2.2.0-alpha)
       Fix Version/s: 1.2.0
    
> 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: 1.2.0, 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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