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


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