问Apache Spark警告“在RowBasedKeyValueBatch上调用spill()”的含义

EN

 /**
   * Sometimes the TaskMemoryManager may call spill() on its associated MemoryConsumers to make
   * space for new consumers. For RowBasedKeyValueBatch, we do not actually spill and return 0.
   * We should not throw OutOfMemory exception here because other associated consumers might spill
   */
  public final long spill(long size, MemoryConsumer trigger) throws IOException {
    logger.warn("Calling spill() on RowBasedKeyValueBatch. Will not spill but return 0.");
    return 0;
  }