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From "Josh Elser (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (ACCUMULO-2842) Allow for use of hflush instead of hsync
Date Fri, 23 May 2014 20:13:02 GMT

     [ https://issues.apache.org/jira/browse/ACCUMULO-2842?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Josh Elser resolved ACCUMULO-2842.
----------------------------------

    Resolution: Fixed

Fix made to allow for use of hflush instead of hsync. Contrived benchmarks show about 30%
performance improvement when using hflush instead of hsync at the cost of durability.

> Allow for use of hflush instead of hsync
> ----------------------------------------
>
>                 Key: ACCUMULO-2842
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-2842
>             Project: Accumulo
>          Issue Type: Improvement
>          Components: logger
>            Reporter: Josh Elser
>            Assignee: Josh Elser
>             Fix For: 1.5.2, 1.6.1, 1.7.0
>
>
> We keep getting onto the discussion on hsync versus hflush performance; however, we lack
a way to actually test this.
> Make the invocation of hflush or hsync configurable. It should not change the default,
so users on existing major releases should not be affected unless they choose to change their
configuration.



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