public void setThriftDefaultBufferSize(int thriftDefaultBufferSize) {
    this.thriftDefaultBufferSize = thriftDefaultBufferSize;
    BaseRpcTransportFactory.setDefaultBufferCapacity(this.thriftDefaultBufferSize);
  }
if the folders are relative paths, add IOTDB_DATA_HOME as the path prefix
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/conf/IoTDBConfig.java