Why would you need doing so?What will happen if I add nodetool cleanup to run periodically (similar to nodetool repair) ? Will node tool cleanup consume lot of IO and CPU even though there is nothing to clean ?
From: Robert Coli <email@example.com>
To: firstname.lastname@example.org; Emalayan Vairavanathan <email@example.com>
Sent: Monday, 10 June 2013 5:15 PM
Subject: Re: [Cassandra] Expanding a Cassandra cluster
On Mon, Jun 10, 2013 at 3:13 PM, Emalayan Vairavanathan
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.