RPC RESPONSE time seems not exactly accurate when using FSEditLogAsync.

      if (!isResponseDeferred()) {
        long deltaNanos = Time.monotonicNowNanos() - startNanos;
        ProcessingDetails details = getProcessingDetails();        
        details.set(Timing.PROCESSING, deltaNanos, TimeUnit.NANOSECONDS);
        deltaNanos -= details.get(Timing.LOCKWAIT, TimeUnit.NANOSECONDS);
        deltaNanos -= details.get(Timing.LOCKSHARED, TimeUnit.NANOSECONDS);
        deltaNanos -= details.get(Timing.LOCKEXCLUSIVE, TimeUnit.NANOSECONDS);
        details.set(Timing.LOCKFREE, deltaNanos, TimeUnit.NANOSECONDS);
        startNanos = Time.monotonicNowNanos();
        setResponseFields(value, responseParams);
        sendResponse();        
        deltaNanos = Time.monotonicNowNanos() - startNanos;
        details.set(Timing.RESPONSE, deltaNanos, TimeUnit.NANOSECONDS);
      } else {
        if (LOG.isDebugEnabled()) {
          LOG.debug("Deferring response for callId: " + this.callId);
        }
      }

    @Override
    public void logSyncNotify(RuntimeException syncEx) {
      try {
        if (syncEx == null) {
          call.sendResponse();
        } else {
          call.abortResponse(syncEx);
        }
      } catch (Exception e) {} // don't care if not sent.
    }