@Override
  public boolean equals(final Object other) {
    if (this == other) {
      return true;
    }
    if (!(other instanceof ServerStateNode)) {
      return false;
    }
    return compareTo((ServerStateNode) other) == 0;
  }
State of Server; list of hosted regions, etc.
hbase-server/src/main/java/org/apache/hadoop/hbase/master/assignment/ServerStateNode.java