void shutdown() {
logger.finest( "Stopping tasks...");
expirationTask.cancel(true);
expirationService.shutdown();
final Object response = new HazelcastInstanceNotActiveException();
final Address thisAddress = nodeEngine.getThisAddress();
for (Queue<WaitingOp> q : mapWaitingOps.values()) {
for (WaitingOp waitingOp : q) {
if (waitingOp.isValid()) {
final Operation op = waitingOp.getOperation();