Hi , I happened to figure out the problem. I had set the replication_factor=1 in cassandra.yaml Changing it to 2, made sure the entire keyspace is stored in each node. ( It has its half and the others half as well)
For others looking at an explanation on Replication Factor and Consistency Level http://permalink.gmane.org/gmane.comp.db.hector.user/392 Thanks Prasanna On Mar 31, 2011, at 6:49 PM, Prasanna Rajaperumal wrote: > Hi All, > > I am trying out a very simple scenario and I dont seem to get it working. It > would be great if I am pointed to some things here. > > I have set up a 2 node cluster, cassandra.yaml being the default and same for > each other than the seed: being each other and I have set the Thrift RPC > address and listen_address to publicly available hostnames. Replication > factory is set to 1 > > I have a client (using Hector) to do some basic operations like write, read, > delete. > > CassandraHostConfigurator config = new > CassandraHostConfigurator("arti-dev-logger-2:9160,arti-dev-logger-1:9160"); > config.setAutoDiscoverHosts(true); > Cluster cluster = HFactory.createCluster("dev_cluster", config); > Keyspace artiKeyspace = > HFactory.createKeyspace(this.getArti_persistence_cassandra_keyspace(), > cluster, new ConsistencyLevelPolicy(){ > @Override > public HConsistencyLevel get(OperationType op) { > return HConsistencyLevel.ONE; > } > @Override > public HConsistencyLevel get(OperationType op, String > cfName) { > return HConsistencyLevel.ONE; > } > }); > > Nodetool show the ring fine. > > [root@arti-dev-logger-1 bin]# ./nodetool -host arti-dev-logger-1 ring > Address Status State Load Owns Token > > > 140881507882391765636814029248607183802 > 171.71.189.47 Up Normal 54.3 KB 60.79% > 74161420796139335783812688622390550898 > 171.71.189.48 Up Normal 66.96 KB 39.21% > 140881507882391765636814029248607183802 > > [root@arti-dev-logger-1 bin]# ./nodetool -host arti-dev-logger-2 ring > Address Status State Load Owns Token > > > 140881507882391765636814029248607183802 > 171.71.189.47 Up Normal 54.3 KB 60.79% > 74161420796139335783812688622390550898 > 171.71.189.48 Up Normal 66.96 KB 39.21% > 140881507882391765636814029248607183802 > > I observe, If I have arti-dev-logger-1 down and run my test against against > the cluster, my test is successful. > If I bring up the arti-dev-logger-1 and take down arti-dev-logger-2, My test > complains > > com.cisco.step.arti.persistence.CassandraException: : May not be enough > replicas present to handle consistency level. > > I would imagine I am doing something very fundamental here, I have not > attached any test case hoping that any experienced person looking at might be > able to figure out what is going on right away. > > Thanks > Prasanna > Prasanna Rajaperumal praja...@cisco.com
