NetworkTopologyStrategy on single cassandra node

Question

I have created a keyspace in cassandra once using NetworkTopologyStrategy and next time using SimpleStrategy with the following syntax :

Keyspace definition:

CREATE KEYSPACE cw WITH REPLICATION = { 'class' : 'NetworkTopologyStrategy', 'datacenter16' : 1 };

CREATE KEYSPACE cw WITH REPLICATION = {'class' : 'SimpleStrategy', 'replication_factor' : 1}

Output of bin/nodetool ring :

Datacenter: 16
==========
Address       Rack        Status State   Load            Owns                Token                                       

172.16.4.196  4           Up     Normal  35.92 KB        100.00%             0

When i create one table in NetworkTopologyStrategy keyspace and do the select * query on the table. It returns the following error :

Unable to complete request: one or more nodes were unavailable

Whereas it works fine in SimpleStrategy keyspace why is it so? Can't we use the NetworkTopologyStrategy on single cassandra node cluster?

MarcintheCloud MarcintheCloud · Accepted Answer · 2015-11-09T18:33:14

While everyone else is right, you are already using a different snitch as your data center name is '16'. In your keyspace definition, you have Datacenter: 16. That means data center name is actually '16'.

Try this:

CREATE KEYSPACE cw WITH REPLICATION = { 'class' : 'NetworkTopologyStrategy', '16' : 1 };

NetworkTopologyStrategy on single cassandra node

3 Answers