@Override
  public void setMaxBytesCanReserve(long maxBytesCanReserve) {
    this.maxBytesCanReserve = Math.min(this.maxBytesCanReserve, maxBytesCanReserve);
  }
max bytes this SinkChannel can reserve.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/execution/exchange/sink/SinkChannel.java