See CASSANDRA-293 and CASSANDRA-494.
Key-range updates touch multiple rows and cannot be performed
atomically, so the consistency promise you get would be the same as
with batch_mutate. Another other problem is that the update needs to
be sent to *any* node that is responsible for part of the ran
Would there be any support for a KeyRange (start/end key) deletion in 0.7?
Carlos
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