// batch_mutate delete by key
for (int i = 0; i < 10; i++) {
ArrayList<Mutation> mutations = new ArrayList<Mutation>(10);
Map<String, List<Mutation>> mutationMap = new HashMap<String, List<Mutation>>();
SlicePredicate slicePredicate = new SlicePredicate();
for (int j = 0; j < 10; j++) {
slicePredicate.addToColumn_names(StringSerializer.get().toByteBuffer("testBatchMutateColumn_" + j));
}
Mutation mutation = new Mutation();
Deletion deletion = new Deletion(connectionManager.createClock());
deletion.setPredicate(slicePredicate);
mutation.setDeletion(deletion);