protected Collection<? extends Operation> cloneGet(KeyedOperation op) {
Collection<Operation> rv=new ArrayList<Operation>();
GetOperation.Callback getCb = null;
GetsOperation.Callback getsCb = null;
if(op.getCallback() instanceof GetOperation.Callback) {
getCb=new MultiGetOperationCallback(
op.getCallback(), op.getKeys().size());
} else {
getsCb=new MultiGetsOperationCallback(
op.getCallback(), op.getKeys().size());
}