Hi, When I upgraded from 0.8.2 to 0.8.3 I encountered a exception during startup: ... Caused by: org.apache.cassandra.config.ConfigurationException: replication_factor is an option for SimpleStrategy, not NetworkTopologyStrategy at org.apache.cassandra.locator.NetworkTopologyStrategy.<init>(NetworkTopologyStrategy.java:70) ...
This was caused by the following change: --- cassandra/trunk/src/java/org/apache/cassandra/locator/NetworkTopologyStrategy.java 2011/07/18 13:32:48 1147869 +++ cassandra/trunk/src/java/org/apache/cassandra/locator/NetworkTopologyStrategy.java 2011/08/02 17:07:22 1153200 @@ -67,7 +67,7 @@ { String dc = entry.getKey(); if (dc.equalsIgnoreCase("replication_factor")) - continue; // TODO remove this for 1.0 + throw new ConfigurationException("replication_factor is an option for SimpleStrategy, not NetworkTopologyStrategy"); Integer replicas = Integer.valueOf(entry.getValue()); newDatacenters.put(dc, replicas); } To solve it use the 'cassandra-cli' on one of the other "up" nodes: [default@unknown] describe keyspace TestKeyspace; WARNING: Could not connect to the JMX on 127.0.0.3:7199, information won't be shown. Keyspace: TestKeyspace: Replication Strategy: org.apache.cassandra.locator.NetworkTopologyStrategy Durable Writes: true Options: [replication_factor:2] ... default@unknown] update keyspace TestKeyspace with strategy_options=[{datacenter:2}]; 47035d20-c2ca-11e0-0000-de5e2f7aa3bf Waiting for schema agreement... ... schemas agree across the cluster [default@unknown] describe keyspace TestKeyspace; Keyspace: TestKeyspace: Replication Strategy: org.apache.cassandra.locator.NetworkTopologyStrategy Durable Writes: true Options: [datacenter:2] Then restart the 0.8.3 node and it should be fine. Regards, -Martin