[jira] [Commented] (CASSANDRA-3878) Allow posix_fadvise call to be skipped based on a configuration option

["Jonathan Ellis (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-3878?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13260563#comment-13260563 ] 

Jonathan Ellis commented on CASSANDRA-3878:
-------------------------------------------

CASSANDRA-2635 adds a flag to disable DONTNEED on writes.  Do we still need a separate one to disable it on reads, too?
                
> 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.

--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira