bulk data load

Hi, I have to add a column and value to current data. I tried with batch statement but got warning at cassandra as WARN [Native-Transport-Requests:1423504] 2014-10-22 16:49:11,426 BatchStatement.java (line 223) Batch of prepared statements for [keyspace.table] is of size 26600, exceeding specifie

too slow to generate sstable with SSTableSimpleUnsortedWriter for composite key structure

Hi, I try to generate sstable for bulk insert. generated table for composite key is nearly x1000 times slower than single primary key. Is there a trick to speed up generation of sstable for composite key? Thanks Koray