public synchronized void repush(E element) {
    if (element == null) {
      throw new NullPointerException("pushed element is null");
    }
    pushToQueue(element);
    reservedSize--;
    size++;
    this.notifyAll();
  }
RePush an element which is polled out for running or blocked before to the queue.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/execution/schedule/queue/IndexedBlockingReserveQueue.java