@Override
  public synchronized void nack() {
    cleanUp();

    // should not reset the iterator of batch when init
    // TODO: avoid completely rewinding the iterator
    batch.resetForIteration();
    init();
  }
The {@code SubscriptionEventTabletResponse} class extends {@link
SubscriptionEventExtendableResponse} to handle subscription responses specifically for tablet
data. The actual payload of the response includes a {@link TabletsPayload}, which contains the
tablet information being processed.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/subscription/event/response/SubscriptionEventTabletResponse.java