enabling different block size setting for small column families

the current setting for hbase block size (kylin.hbase.default.block.size) is by default set to a quite large value because cubes can be quite big value(4M) because cubes with memory hungry measures like hll can be quite large. However if a column family does not contain memory hungry measures it does not make sense to be that large.

the revised setting will be:

public int getHbaseDefaultBlockSize()

{ return Integer.valueOf(getOptional("kylin.hbase.default.block.size", "1048576")); }

public int getHbaseSmallFamilyBlockSize()

{ return Integer.valueOf(getOptional("kylin.hbase.small.family.block.size", "65536")); }