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From Alain RODRIGUEZ <>
Subject EC2 zones, snitches and vnodes
Date Thu, 03 Apr 2014 15:38:33 GMT

We are using Cassandra 1.2.11 on AWS EC2 services.

I read that we can use different A-Z to be more "crash tolerant".
Basically, using a RF=3 and placing servers into different zones like
node1-zoneA node2-zoneB node3-zoneC node4-zoneA... As replicas are placed
to the next server in the ring we can manage to have a replica in each zone
and for each replica. So all the data is present in the 3 zones (A, B and

Is there a way to achieve this exact same result using vnodes ? Would it be
possible, using EC2Snitch (or EC2MultiRegionSnitch) and vnodes, to make
sure to spread replicas among available A-Z automatically ?

I know that a second DC would help recovering from a zone outage, but, the
cost is not the same.

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