I see, thank you. So that feature is coming. Any idea if the same will be true for local_quorum? That is, if a read repair will happen in the background for all nodes including nodes in other datacenters? ________________________________________ From: Jonathan Ellis [jbel...@gmail.com] Sent: Monday, December 27, 2010 6:59 PM To: user Subject: Re: read repair across datacenters?
https://issues.apache.org/jira/browse/CASSANDRA-982 On Mon, Dec 27, 2010 at 5:55 PM, Shu Zhang <szh...@mediosystems.com> wrote: > Brandon, for a read with quorum CL, a response is returned to the client > after half (rounded up) the replica nodes responds. Do you mean that those > half are RR'ed before the response is returned to the client and the other > half RR'ed asynchronously? Or is it that the other half of replicas are not > RR'ed? > > ________________________________________ > From: Brandon Williams [dri...@gmail.com] > Sent: Monday, December 27, 2010 3:00 PM > To: user@cassandra.apache.org > Subject: Re: read repair across datacenters? > > On Mon, Dec 27, 2010 at 4:44 PM, Narendra Sharma > <narendra.sha...@gmail.com<mailto:narendra.sha...@gmail.com>> wrote: > 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? > > Yes, because on quorum or greater the RR is performed before the response is > returned. > > 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. > > https://issues.apache.org/jira/browse/CASSANDRA-1530 > > <https://issues.apache.org/jira/browse/CASSANDRA-1530>-Brandon > -- Jonathan Ellis Project Chair, Apache Cassandra co-founder of Riptano, the source for professional Cassandra support http://riptano.com
