Hi Rob, Thanks for sharing the link. I have gone through it and few other documents as well. Still I am confused. It seems, if we use vnodes and NetworkTopologyStrategy, we should use a single rack configuration in Cassandra. Or, it can create hotspots in the ring. Not sure if my understanding is correct.
Regards. On 28-Feb-2015, at 2:42 am, Robert Coli <rc...@eventbrite.com> wrote: > On Fri, Feb 27, 2015 at 7:30 AM, Amlan Roy <amlan....@cleartrip.com> wrote: > I am new to Cassandra and trying to setup a Cassandra 2.0 cluster using 4 > nodes, 2 each in 2 different racks. All are in same data centre. This is what > I see in the documentation: > > To use racks correctly: > > Use the same number of nodes in each rack. Use one rack and place the nodes > in different racks in an alternating pattern. This allows you to still get > the benefits of Cassandra's rack feature, and allows for quick and fully > functional expansions. Once the cluster is stable, you can swap nodes and > make the appropriate moves to ensure that nodes are placed in the ring in an > alternating fashion with respect to the racks. > What I have understood is, in cassandra-rackdc.properties, I need to use > single rack name even though I have 2 racks and then place the nodes in such > an order that they are placed in an alternating fashion - RAC1-NODE1, > RAC2-NODE1, RAC1-NODE2, RAC2-NODE2. > > Just wanted to know if this is correct. If yes, how do I enforce this order > while adding nodes. > > https://issues.apache.org/jira/browse/CASSANDRA-3810 > > =Rob >
