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Re: UnknownColumnFamilyException after removing all Cassandra data


The node is trying to communicate with another node, potentially streaming data, and is receiving files/data for an "unknown column family". That is, it doesn't know about the CF with the id e36415b6-95a7-368c-9ac0-ae0ac774863d.
If you deleted some columnfamilies but not all the system keyspace and restarted the node I'd expect this error to occur. Or I suppose if you didn't decommission the node properly before blowing the data away and restarting.

You'll have to give us more information on what your exact steps were on this 2nd node:

When you say deleted all Cassandra data, did this include the system tables? Were your steps to delete all the data and then just restart the node? Did you remove the node from the cluster prior to deleting the data and restarting it (nodetool decommission/removenode? Did the node rejoin the cluster or did it have to bootstrap?