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https://issues.apache.org/jira/browse/HDFS-3697?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Todd Lipcon updated HDFS-3697:
------------------------------
Attachment: hdfs-3697.txt
Attached patch enables the readahead to 4MB by default. Experimentally we've
determined this provides a good performance boost without too high an increase
in buffer cache usage.
I also took the liberty of adding documentation for the other fadvise
parameters to hdfs-default.xml in this patch.
> 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
> Attachments: 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 them by default in future versions so that users get this benefit
> without any manual configuration required.
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