public void addNode(final TRemote key) {
    assert key != null : "Tried to add a node with a null key";
    nodeMap.computeIfAbsent(key, k -> new BufferNode(k));
  }
Add a node that will be able to execute remote procedures
@param key the node identifier
hbase-procedure/src/main/java/org/apache/hadoop/hbase/procedure2/RemoteProcedureDispatcher.java