Question

I’m having problems creating a keyspace using the network topology.

Code:

// The Astyanax context I'm using
AstyanaxContext<Keyspace> context = new AstyanaxContext.Builder()
    .forCluster("Test Cluster")
    .forKeyspace("NetworkKS")
    .withAstyanaxConfiguration(new AstyanaxConfigurationImpl()      
    .setDiscoveryType(NodeDiscoveryType.NONE))
    .withConnectionPoolConfiguration(new ConnectionPoolConfigurationImpl("MyConnectionPool")
    .setPort(9160)
    .setMaxConnsPerHost(10)
    .setInitConnsPerHost(1)
    .setSeeds("127.0.0.1:9160"))
    .withConnectionPoolMonitor(new Slf4jConnectionPoolMonitorImpl())
    .buildKeyspace(ThriftFamilyFactory.getInstance());

    context.start();

// A different method takes the above context as a keyspace parameter
keyspace.createKeyspace(ImmutableMap.<String, Object>builder()
            .put("strategy_options", ImmutableMap.<String, Object>builder()
            .put("us-east", "3")
            .put("eu-west", "3")
            .put("replication_factor", "1").build())
            .put("strategy_class", "NetworkTopologyStrategy").build());

I know it seems pointless creating a networkstrategy keyspace for one node, but this is just a test, once I get it working I’ll add another Cassandra instance to the seeds.

The error is:

[AWT-EventQueue-0] WARN com.netflix.astyanax.connectionpool.impl.Slf4jConnectionPoolMonitorImpl - TransportException: [host=127.0.0.1(127.0.0.1):9160, latency=42(42), attempts=1]org.apache.thrift.transport.TTransportException
[AWT-EventQueue-0] INFO com.netflix.astyanax.connectionpool.impl.Slf4jConnectionPoolMonitorImpl - TransportException: [host=127.0.0.1(127.0.0.1):9160, latency=42(42), attempts=1]org.apache.thrift.transport.TTransportException
Jan 27, 2013 4:42:39 PM smail.cli.astyanax.Schema createNetworkKeyspace
SEVERE: null
com.netflix.astyanax.connectionpool.exceptions.TransportException: TransportException: [host=127.0.0.1(127.0.0.1):9160, latency=42(42), attempts=1]org.apache.thrift.transport.TTransportException
    at com.netflix.astyanax.thrift.ThriftConverter.ToConnectionPoolException(ThriftConverter.java:197)
    at com.netflix.astyanax.thrift.AbstractOperationImpl.execute(AbstractOperationImpl.java:60)
    at com.netflix.astyanax.thrift.AbstractOperationImpl.execute(AbstractOperationImpl.java:27)
    at com.netflix.astyanax.thrift.ThriftSyncConnectionFactoryImpl$1.execute(ThriftSyncConnectionFactoryImpl.java:136)
    at com.netflix.astyanax.connectionpool.impl.AbstractExecuteWithFailoverImpl.tryOperation(AbstractExecuteWithFailoverImpl.java:69)
    at com.netflix.astyanax.connectionpool.impl.AbstractHostPartitionConnectionPool.executeWithFailover(AbstractHostPartitionConnectionPool.java:248)
    at com.netflix.astyanax.thrift.ThriftKeyspaceImpl.createKeyspace(ThriftKeyspaceImpl.java:545)
    at smail.cli.astyanax.Schema.createNetworkKeyspace(Schema.java:121)
    at smail.cli.test.SchemaCreationTest.createNetKS(SchemaCreationTest.java:21)
    at smail.cli.test.SchemaCreationTest.runTest(SchemaCreationTest.java:50)
    at smail.cli.Main$1.run(Main.java:48)

Answer 1

You’ll be able to create such a keyspace, if you first update your Cassandra configuration. You have to update cassandra-topology.properties in your node configuration, to tell either a default settings or describe you data centers and racks. The default content of the file is self explanatory.

After that is setup properly, you can properly create your keyspace. But it is better to follow the advice of jbellis, to not create the keyspace from code.