public MutateResponse mutate(final RpcController rpcc,
final MutateRequest request) throws ServiceException {
// rpc controller is how we bring in data via the back door; it is unprotobuf'ed data.
// It is also the conduit via which we pass back data.
PayloadCarryingRpcController controller = (PayloadCarryingRpcController)rpcc;
CellScanner cellScanner = controller != null? controller.cellScanner(): null;
// Clear scanner so we are not holding on to reference across call.
controller.setCellScanner(null);
try {
requestCount.increment();
HRegion region = getRegion(request.getRegion());