Log UnknownColumnfamilyException when closing socket
patch by Suresh; reviewed by Sergio Bossa and jbellis for CASSANDRA-5725
Properly error out on CREATE INDEX on counter tables

patch by slebresne; reviewed by jbellis for CASSANDRA-6160
Handle JMX notification failure for repair

patch by yukim; reviewed by pcmanus for CASSANDRA-6097
fix trace activity from #6133
Fetch no more than 128 splits in parallel
patch by Patricio Echague; reviewed by jbellis for CASSANDRA-6169