Improve memory usage of metadata min/max column names
patch by Oleg Anastasyev; reviewed by jbellis for CASSANDRA-6077
merge from 2.0
Move batchlog replay to its own executor
patch by Oleg Anastasyev; reviewed by jbellis for CASSANDRA-6079
Merge branch 'cassandra-2.0' into trunk
backport CASSANDRA-6079
CHANGES
Merge branch 'cassandra-1.2' into cassandra-2.0
merge from 1.2
Merge branch 'cassandra-2.0' into trunk