add nodetool enablebackup/disablebackup
patch by pmargolin reviewed by dbrosius for CASSANDRA-5556
Merge branch 'cassandra-1.2' into trunk
don't create empty RowMutations in CommitLogReplayer
patch by jbellis reviewed by dbrosius for (CASSANDRA-5541)
Ensure that submitBackground enqueues at least one task
patch by Oleg Anastasyev; reviewed by jbellis for CASSANDRA-5554
Ensure that submitBackground enqueues at least one task
patch by Oleg Anastasyev; reviewed by jbellis for CASSANDRA-5554
fix memorySize bugs and cleanup
patch by Carl Yeksigian and jbellis for CASSANDRA-5564
merge from 1.2
presize collections
remove unused local 'builder' var
remove unused field BOOTSTRAP_TIMEOUT
revert CASSANDRA-5523
Merge branch 'cassandra-1.2' into trunk
remove unused serializedSize field