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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3697) Enable fadvise readahead by default
Date Mon, 23 Jul 2012 17:12:35 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3697?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13420793#comment-13420793

Todd Lipcon commented on HDFS-3697:

You mean the datanode, right?

It would be worth considering adding these as per-stream flags - e.g an HDFS "fadvise"-like
API on DFSInputStream/DFSOutputStream that changes the behavior. Then, the datanode-wide flags
would just serve as defaults.
> 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
> The other fadvise features seem to be more workload-dependent and need further testing
before enabling by default.

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