public static void cancelRequest(int msgId, ClusterDistributionManager dm) {
    AdminReplyProcessor processor = (AdminReplyProcessor) ReplyProcessor21.getProcessor(msgId);
    if (processor != null) {
      InternalDistributedMember recipient = processor.getResponder();
      dm.putOutgoing(CancellationMessage.create(recipient, msgId));
      processor.cancel();
    }
  }
Call with the id of a RemoteGfManager that no longer exists. All outstanding requests to that
manager will be cancelled.
geode-core/src/main/java/org/apache/geode/internal/admin/remote/AdminWaiters.java