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From Jonathan Ellis <>
Subject Re: Minimizing the impact of compaction on latency and throughput
Date Tue, 13 Jul 2010 02:52:23 GMT
This looks relevant: (see
comments for directions to code sample)

On Fri, Jul 9, 2010 at 1:52 AM, Peter Schuller
<> wrote:
>> It might be worth experimenting with posix_fadvise.  I don't think
>> implementing our own i/o scheduler or rate-limiter would be as good a
>> use of time (it sounds like you're on that page too).
> Ok. And yes I mostly agree, although I can imagine circumstances where
> a pretty simple rate limiter might help significantly - albeit be
> something that has to be tweaked very specifically for the
> situation/hardware rather than being auto-tuned.
> If I have the time I may look into posix_fadvise() to begin with (but
> I'm not promising anything).
> Thanks for the input!
> --
> / Peter Schuller

Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of Riptano, the source for professional Cassandra support

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