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From Robert Coli <rc...@eventbrite.com>
Subject Re: Parallel repairs
Date Fri, 14 Aug 2015 18:44:15 GMT
On Fri, Aug 14, 2015 at 11:33 AM, Stan Lemon <slemon@salesforce.com> wrote:

> Is it safe to run repairs in parallel on multiple nodes in the same DC at
> the time or is this discouraged?
>

If you have enough headroom, it's safe. It may impact latency.

It also depends on whether you have vnodes or not. If you don't, and you
use -par option to repair, you will repair a set of nodes but not all
nodes. If you do use vnodes, you will effectively repair a range already on
all nodes with -par repair. If you do a rolling -par -pr on a cluster with
vnodes, you'll probably be getting close to ideal parallelism anyway.

=Rob

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