code: def start(self, spark_host_address: str = "") -> None:
      if self.server:
          raise RuntimeError("Cannot start the server twice.")
  
      def serve_task(port: int) -> None:
          with socketserver.ThreadingTCPServer(
              ("0.0.0.0", port), WriteLogToStdout
          ) as server:
              self.server = server
              server.is_active = True
              server.serve_forever(poll_interval=_SERVER_POLL_INTERVAL)
  
      self.port = LogStreamingServer._get_free_port(spark_host_address)
      self.serve_thread = threading.Thread(
          target=serve_task, args=(self.port,)
      )
      self.serve_thread.setDaemon(True)
      self.serve_thread.start()
  
imports: from contextlib import closing
  import time
  import socket
  import socketserver
  from struct import pack, unpack
  import sys
  import threading
  import traceback
  from typing import Generator
  import warnings
label_desc: Use image node_id 3 for calling the LogStreamingServer obj's underlying member method code with example usage: obj.start(spark_host_address) without return types