Happens to any keyspace — not just system — if there are competing processes initializing the system , creating / altering new things without CL=all it may do this. I ran into a scenario where when permissions were flipped to a non Cassandra user, the Cassandra daemon lost access to the data so it reinitialized the system.
-- Rahul Singh rahul.si...@anant.us Anant Corporation On Apr 17, 2018, 2:25 PM -0500, John Sanda <john.sa...@gmail.com>, wrote: > On a couple different occasions I have run into this exception at start up: > > Exception (org.apache.cassandra.exceptions.InvalidRequestException) > encountered during startup: Unknown type <user type> > org.apache.cassandra.exceptions.InvalidRequestException: Unknown type <user > type> > at > org.apache.cassandra.cql3.CQL3Type$Raw$RawUT.prepare(CQL3Type.java:745) > at > org.apache.cassandra.cql3.CQL3Type$Raw.prepareInternal(CQL3Type.java:533) > at > org.apache.cassandra.schema.CQLTypeParser.parse(CQLTypeParser.java:53) > at > org.apache.cassandra.schema.SchemaKeyspace.createColumnFromRow(SchemaKeyspace.java:1052) > at > org.apache.cassandra.schema.SchemaKeyspace.lambda$fetchColumns$12(SchemaKeyspace.java:1038) > > This was with Cassandra 3.0.12 running in Kubernetes, which means that IP > address changes for the Cassandra node can and will happen. Nowhere in client > code does the UDT get dropped. I came across > https://issues.apache.org/jira/browse/CASSANDRA-13739 which got me wondering > if this particular Cassandra node wound up with another version of the > system_schema.types table which did not have the UDT. > > In what circumstances could I end up with multiple table directories for the > tables in system_schema? Right now I am just guessing that I wound up with a > newer (or different) version of the system_schema.types table. Unfortunately, > I no longer have access to the environment to confirm/deny what was > happening. I just want to better understand so I can avoid it in the future. > > > - John
