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From Narendra Sharma <>
Subject Re: read repair across datacenters?
Date Mon, 27 Dec 2010 22:44:51 GMT
The comment in the cassandra.yaml says:
"specifies the probability with which read repairs should be invoked on *
non-quorum* reads"

Does this mean RR chance is applicable only for non-quorum reads?

Another question on same topic:
Will RR use one of the node in the other datacenter as coordinator instead
of sending the data to each replica (assuming they have old data)? This is
to reduce the amount of network traffic between datacenters.


On Mon, Dec 27, 2010 at 1:26 PM, Brandon Williams <> wrote:

> On Mon, Dec 27, 2010 at 3:17 PM, Shu Zhang <>wrote:
>> Hi, I'm pretty new to cassandra and read a couple of contradictory things
>> on this topic. Does read repair get triggered across datacenters if you
>> query with a consistency level of local_quorum?
> If the RR chance is 100% (default), it's triggered regardless of CL, which
> only controls how synchronously the repair is performed.
> -Brandon

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