Thank you Robert and all others who replied to my question. 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 ?
Thank you Emalayan ________________________________ From: Robert Coli <rc...@eventbrite.com> To: user@cassandra.apache.org; Emalayan Vairavanathan <svemala...@yahoo.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 <svemala...@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
