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


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:
>             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

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