class_docstr: A monitor process for monitoring worker log files.
code: def check_and_open_log_file(self):
      if not self.log_fd:
          if os.path.exists(self.log_path):
              self.log_fd = open(self.log_path, "rb")
  
file_path: BigDL/python/orca/src/bigdl/orca/learn/log_monitor.py
imports: import logging
  import os
  import time
  from bigdl.dllib.utils.log4Error import *
label_desc: Use image node_id 3 for calling the LogMonitor obj's underlying member method code with example usage: obj.check_and_open_log_file() without return types