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From Jonathan Ellis <>
Subject Re: Parallel Compaction
Date Fri, 17 Dec 2010 14:15:25 GMT
On Fri, Dec 17, 2010 at 8:01 AM, Germán Kondolf <>wrote:

> Thanks Jonathan for the feedback.
> By flush/schema migration you mean the SSTables replace lock? I've put
> that lock just to be sure, if it's fine by you I'll remove it.
> I'll clean up the code according to the code-style article, add the
> parameter to the configuration using a default of "1" and I'll send it
> again.
> Why do you think is only worth it on SSDs?

Because even a single compaction causes a ton of i/o contention.  99% of the
time your concern is how to make compaction use _less_ resources, not more.

How do I get to commit this patch?

Attach it to a ticket on

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

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