Thanks. After some re-thinking you're right for multi-put using a Mutator. Multi-get won't make difference to the default-implementation, because range-queries over row-keys is usually not supported (depends on Cassandra-Partitioner which is usually a random one and not an ordered one), so we would need to supply the row-keys one query at a time, anyways. However, it perfectly makes sense for the dynamic column store, depending on the layout of keys, which clients are choosing. In that case we can make use of both multi-picking of columns (within one row) and slice queries supplying parameters to the query. However, i think the latter is not according to the method signature of multiget and will require to add a new method.