cassandra-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Emalayan Vairavanathan <>
Subject Re: [Cassandra] Expanding a Cassandra cluster
Date Wed, 12 Jun 2013 01:22:40 GMT
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

 From: Robert Coli <>
To:; Emalayan Vairavanathan <> 
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
<> 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.

View raw message