public long getLoadScore() {
    return ((NodeStatistics) currentStatistics.get()).getLoadScore();
  }
TODO: The loadScore of each Node will be changed to Double

@return The latest load score of a node, the higher the score the higher the load
iotdb-core/confignode/src/main/java/org/apache/iotdb/confignode/manager/load/cache/node/BaseNodeCache.java