we have two DC with 5 nodes in each cluster, yesterday there was an electricity outage causing all nodes down, we restart the clusters but when we run nodetool status on DC1 it results that some nodes are DN, the strange thing is that running the command from diffrent node in DC1 doesn't give the same node in DC as own, we have noticed this message in the log "received an invalid gossip generation for peer", does anyone know how to resolve this problem? should we purge the gossip?