I'm using Pig to calculate the sum of a columns from a columnfamily (scan of all rows) and I've read that input data locality is supported at http://wiki.apache.org/cassandra/HadoopSupport
However when I execute my Pig script Hadoop assigns only one mapper to the task and not one mapper on each node (replication factor = 1).  FYI, I've 8 mappers available (2 per node).
Is there anything that can disable the data locality feature ? 



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