Unexpected exception during request

Question

I\'m using apache cassandra 2.2.4. I have a 4 (four) node cluster with Replication Factor 3 in DC1 and Replication Factor 1 in DC2, where DC1 contains 3 (three)

Answer 1

Please make sure that your Firewall is not dropping TCP connections which are in use. Tcp keep alive on all nodes must be less than the firewall setting. Please refer to https://docs.datastax.com/en/cassandra/2.0/cassandra/troubleshooting/trblshootIdleFirewall.html for details on TCP settings. This helped me resolve the issue.