public Node addLiveNode(String name, long startCode, int heapSizeMB, int maxHeapSizeMB) {
    Node node = new Node(name, startCode);
    node.setHeapSizeMB(heapSizeMB);
    node.setMaxHeapSizeMB(maxHeapSizeMB);
    liveNodes.add(node);
    return node;
  }
Add a live node to the cluster representation.
@param name          the region server name
@param startCode     the region server's start code
@param heapSizeMB    the current heap size, in MB
@param maxHeapSizeMB the maximum heap size, in MB
hbase-rest/src/main/java/org/apache/hadoop/hbase/rest/model/StorageClusterStatusModel.java