Upgrade-RHOP-R4.1.1.1 to R4.1.2 build-19 cassandra failed to come up on analyticsdb

analyticsdb node cassandra service failed to come up after upgrade

After upgrading the cluster from R4.1.1 to R4.1.2, we are removing the entry 'num_tokens: 256' from cassadra.yaml causing the issue.

While we upgrade, do not remove num_token entry.

Workaround:
======

After setting 'num_tokens: 256' in /etc/cassandra/conf/cassandra.yaml
restart service contrail-database

command: service contrail-database restart

log:
 ===

 [main] 2018-10-29 20:16:14,806 StorageService.java:825 - Starting up server gossip
INFO [main] 2018-10-29 20:16:14,904 TokenMetadata.java:479 - Updating topology for /10.0.0.60
INFO [main] 2018-10-29 20:16:14,904 TokenMetadata.java:479 - Updating topology for /10.0.0.60
ERROR [main] 2018-10-29 20:16:14,966 CassandraDaemon.java:708 - Fatal configuration error
org.apache.cassandra.exceptions.ConfigurationException: Cannot change the number of tokens from 256 to 1
        at org.apache.cassandra.service.StorageService.joinTokenRing(StorageService.java:989) ~[apache-cassandra-3.11.2.jar:3.11.2]
        at org.apache.cassandra.service.StorageService.initServer(StorageService.java:682) ~[apache-cassandra-3.11.2.jar:3.11.2]
        at org.apache.cassandra.service.StorageService.initServer(StorageService.java:613) ~[apache-cassandra-3.11.2.jar:3.11.2]
        at org.apache.cassandra.service.CassandraDaemon.setup(CassandraDaemon.java:379) [apache-cassandra-3.11.2.jar:3.11.2]
        at org.apache.cassandra.service.CassandraDaemon.activate(CassandraDaemon.java:602) [apache-cassandra-3.11.2.jar:3.11.2]
        at org.apache.cassandra.service.CassandraDaemon.main(CassandraDaemon.java:691) [apache-cassandra-3.11.2.jar:3.11.2]
INFO [StorageServiceShutdownHook] 2018-10-29 20:16:14,977 HintsService.java:220 - Paused hints dispatch
INFO [StorageServiceShutdownHook] 2018-10-29 20:16:14,977 Gossiper.java:1540 - Announcing shutdown
INFO [StorageServiceShutdownHook] 2018-10-29 20:16:14,978 StorageService.java:2292 - Node /10.0.0.60 state jump to shutdown
INFO [CompactionExecutor:2] 2018-10-29 20:16:16,805 PerSSTableIndexWriter.java:275 - Scheduling index flush to /var/lib/cassandra/data/ContrailAnalyticsCql/messagetablev3-a3255230db0d11e8812e718c1d8dee9d/mc-5-big-SI_messagetablev3_column10_idx.db