incubator-cassandra-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Michal Michalski <mich...@opera.com>
Subject Re: [Cassandra] Expanding a Cassandra cluster
Date Wed, 12 Jun 2013 06:02:02 GMT
> 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 ?

Why would you need doing so?

M.

>
> Thank you
> Emalayan
>
>
> ________________________________
>   From: Robert Coli <rcoli@eventbrite.com>
> To: user@cassandra.apache.org; Emalayan Vairavanathan <svemalayan@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
> <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
>


Mime
View raw message