AMRMClientAsync will stop if any exceptions thrown on allocate call

          try {
            response = client.allocate(progress);
          } catch (ApplicationAttemptNotFoundException e) {
            handler.onShutdownRequest();
            LOG.info("Shutdown requested. Stopping callback.");
            return;
          } catch (Throwable ex) {
            LOG.error("Exception on heartbeat", ex);
            savedException = ex;
            // interrupt handler thread in case it waiting on the queue
            handlerThread.interrupt();
            return;
          }