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Posted to client-dev@cassandra.apache.org by Aaron Morton <aa...@the-mortons.org> on 2010/09/01 03:35:22 UTC

Detecting cluster membership

When I first started writing code against the thrift API the FAQ recommended using a round robin DNS to select nodes http://wiki.apache.org/cassandra/FAQ#node_clients_connect_to

The other day Ben said something like "well behaved clients use describe_ring to keep track of running nodes". http://www.mail-archive.com/user@cassandra.apache.org/msg05588.html 

So am wondering what approach people are taking to detecting cluster membership. 

1. Round Robin

2. List seeds in app config, connect to a seed, use describe_ring. 

3. Round robin and describe_ring

One issue I've found with round robin, is that is the machine is powered off it can take a while for the network to work out there is no ARP for the IP. This may just be a result of the network here, have not looked into it too far. 

cheers
Aaron