class_docstr: A monitor process for monitoring worker log files.
docstr: Get any changes to the log file and push updates to zmq.
  
  Returns:
      True if anything was published and false otherwise.
docstr_tok: ["Get","any","changes","to","the","log","file","and","push","updates","to","zmq",".","Returns",":","True","if","anything","was","published","and","false","otherwise","."]
code: def check_log_file_and_publish_updates(self):
      """
      Get any changes to the log file and push updates to zmq.
  
      Returns:
          True if anything was published and false otherwise.
      """
      anything_published = False
      if self.log_fd:
          invalidInputError(
              not self.log_fd.closed, "expect log is not closed here"
          )
  
          lines_to_publish = []
          max_num_lines_to_read = 50
          for _ in range(max_num_lines_to_read):
              try:
                  next_line = self.log_fd.readline()
                  next_line = next_line.decode("utf-8", "replace")
                  if next_line == "":
                      break
                  if next_line[-1] == "\n":
                      next_line = next_line[:-1]
                  new_line = (
                      "[partition = {}, ip = {}] ".format(
                          self.partition_id, self.ip
                      )
                      + next_line
                  )
                  lines_to_publish.append(new_line)
              except Exception:
                  msg = "Error: Reading file: {} at position: {} failed.".format(
                      self.log_path, self.log_fd.tell()
                  )
                  invalidInputError(False, msg)
  
          if len(lines_to_publish) > 0:
              message = "\n".join(lines_to_publish)
              self.socket.send_string(message)
              res = self.socket.recv().decode("utf-8")
              if res == "received":
                  anything_published = True
  
      return anything_published
  
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 4 for calling the LogMonitor obj's underlying member method code with example usage: obj.check_log_file_and_publish_updates() and returns: anything_published