long startTime = 0;
if (LOG.isTraceEnabled()) {
startTime = System.currentTimeMillis();
}
PayloadCarryingRpcController pcrc = (PayloadCarryingRpcController)controller;
CellScanner cells = null;
if (pcrc != null) {
cells = pcrc.cellScanner();
// Clear it here so we don't by mistake try and these cells processing results.
pcrc.setCellScanner(null);
}