is there any type of table existing on all nodes(slow to up date, fast to read in map/reduce)?

[Hiller, Dean]

I was just wondering if cassandra had any special CF that every row exists on 
every node for smaller tables that we would want to leverage in map/reduce.  
The table row count is less than 500k and we are ok with slow updates to the 
table, but this would make M/R blazingly fast since for every row, we read into 
this table.

Thanks,
Dean