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Date: Mon, 10 Jun 2013 17:15:58 -0700
Message-ID: 
 <CAEDUwd0oz2_os53nKe17ZRCBTGiTOMb-Kvq8miD-EzMj9O17ig@mail.gmail.com>
Subject: Re: [Cassandra] Expanding a Cassandra cluster
From: Robert Coli <rcoli@eventbrite.com>
To: user@cassandra.apache.org, Emalayan Vairavanathan <svemalayan@yahoo.com>
Content-Type: text/plain; charset=ISO-8859-1

On Mon, Jun 10, 2013 at 3:13 PM, Emalayan Vairavanathan
<svemalayan@yahoo.com> wrote:
> I suspect that nodetool cleanup is IO intensive. So running nodetool cleanup
> concurrently on the entire cluster may have a significantly impact the IO
> performance of applications.

cleanup is a specific kind of compaction, and as such respects the
compaction throughput throttle.

The compaction throughput throttle is designed to prevent compaction
from negatively impacting the performance of things-not-compaction. If
you notice that cleanup compaction on all or most nodes consumes too
much i/o, reduce the throttle value.

=Rob