升级cassandra中的节点后，发生了日志中的这些错误： 我想调查，但没有方向，任何线索都会有所帮助 感谢
2016/09/19 06:24:49 [INFO] core: post-unseal setup starting
2016/09/19 06:24:49 [INFO] core: mounted backend of type generic at secret/
2016/09/19 06:24:49 [INFO] core: mounted backend of type cubbyhole at cubbyhole/
2016/09/19 06:24:49 [INFO] core: mounted backend of type system at sys/
2016/09/19 06:24:49 [INFO] core: mounted backend of type cassandra at cassandra/
2016/09/19 06:24:49 [INFO] rollback: starting rollback manager
2016/09/19 06:24:50 [INFO] expire: restored 2 leases
2016/09/19 06:24:50 [INFO] core: post-unseal setup complete
2016/09/19 06:24:55 gocql: unable to dial control conn node-0.cassandra-app.mesos:9042: dial tcp 10.0.2.42:9042: getsockopt: connection refused
2016/09/19 06:25:12 error: failed to connect to 10.0.2.42:9042 due to error: gocql: no response to connection startup within timeout
答案 0 :(得分：1)
Cassandra集群不兼容跨版本，只能升级节点，必须升级集群。这是人们常犯的一个常见错误，请看这段视频here它提到了这个问题，它也非常有用，有很多好的信息。