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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (CASSANDRA-3878) Allow posix_fadvise call to be skipped based on a configuration option
Date Fri, 15 Feb 2013 05:55:13 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-3878?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jonathan Ellis resolved CASSANDRA-3878.
---------------------------------------

    Resolution: Duplicate

We're ripping out fadvise from compaction reads (CASSANDRA-4937), so that would seem to take
care of that.
                
> Allow posix_fadvise call to be skipped based on a configuration option
> ----------------------------------------------------------------------
>
>                 Key: CASSANDRA-3878
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3878
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Rick Branson
>            Assignee: Rick Branson
>              Labels: datastax_qa
>
> It is sometimes desirable to skip the posix_fadvise() call performed on SSTable files
when Cassandra has JNA enabled, without disabling JNA as other functionality is dependent
on JNA such as the off-heap row cache. This can be either for performance reasons, or to avoid
bugs caused by faulty interactions of the fadvise call with the underlying hardware and it's
drivers. 
> The enhancement is to be able to disable the fadvise() call using an option in the cassandra.yaml
file.

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