Purging gossip state on a node

Correcting a problem in the gossip state.

You may want to clear gossip history on node restart in certain cases, such as when node IP addresses have changed.

Procedure

Edit the cassandra-env.sh file:
- Packaged installs: /usr/share/cassandra
- Tarball installs: install_location/conf
Add the following line to the cassandra-env.sh file:
```
-Dcassandra.load_ring_state=false
```

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