code: def _check_consumer_alive(self):
      try:
          if self._latest_confirmed is not None:
              self._consumer_receive.acknowledge(self._latest_confirmed)
              return True
          else:
              return False
      except Exception:
          self._consumer_conn = None
          self._consumer_receive = None
          return False
  
file_path: FATE/python/fate/arch/federation/backends/pulsar/_mq_channel.py
imports: import logging
  import pulsar
  from fate.arch.federation.message_queue import nretry
label_desc: Use image node_id 10 for calling the MQChannel obj's underlying member method code with example usage: obj._check_consumer_alive() and returns: True, False, False