Handling schema disagreements
In the event that a schema disagreement occurs, check for and resolve schema disagreements as follows:
Using the Command Line Interface (CLI), run the DESCRIBE CLUSTER command.
$ cassandra-cli -host localhost -port 9160 [default@unknown] DESCRIBE cluster;If any node is UNREACHABLE, you see output something like this:
[default@unknown] describe cluster; Cluster Information: Snitch: com.datastax.bdp.snitch.DseDelegateSnitch Partitioner: org.apache.cassandra.dht.RandomPartitioner Schema versions: UNREACHABLE: [10.202.205.203, 10.80.207.102, 10.116.138.23]
- Restart unreachable nodes.
- Repeat steps 1 and 2 until the DESCRIBE cluster command shows that all nodes have the same schema version number―only one schema version appears in the output of DESCRIBE cluster.