We run Cassandra 2.1.13 and since last few days we're seeing below in logs 
occasionally. The node then becomes unresponsive to cqlsh.

ERROR [SharedPool-Worker-2] 2017-11-08 17:02:32,362 CommitLogSegment.java:441 - 
Attempted to write commit log entry for unrecognized column family: 


The column family has heavy writes, but it hasn't changed schema / load wise 
recently. How can this be troubleshooted / fixed ?

Thanks !

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