these are both ConcurrentModificationExceptions https://issues.apache.org/jira/browse/CASSANDRA-864 https://issues.apache.org/jira/browse/CASSANDRA-865
this one is an AssertError https://issues.apache.org/jira/browse/CASSANDRA-866
these are both ConcurrentModificationExceptions https://issues.apache.org/jira/browse/CASSANDRA-864 https://issues.apache.org/jira/browse/CASSANDRA-865
this one is an AssertError https://issues.apache.org/jira/browse/CASSANDRA-866