kafka: remove no really implemented feature

Change-Id: I6f2693c48d5d0ac1af68b3d4bb5ff361facef977

oslo_messaging/_drivers/impl_kafka.py

@@ -129,11 +129,6 @@ class Connection(object):
         self.group_id = driver_conf.consumer_group
         self.url = url
         self._parse_url()
-        # TODO(Support for manual/auto_commit functionality)
-        # When auto_commit is False, consumer can manually notify
-        # the completion of the subscription.
-        # Currently we don't support for non auto commit option
-        self.auto_commit = True
         self._consume_loop_stopped = False
 
     def _parse_url(self):
@@ -229,17 +224,6 @@ class Connection(object):
             self.consumer.close()
             self.consumer = None
 
-    def commit(self):
-        """Commit is used by subscribers belonging to the same group.
-        After subscribing messages, commit is called to prevent
-        the other subscribers which belong to the same group
-        from re-subscribing the same messages.
-
-        Currently self.auto_commit option is always True,
-        so we don't need to call this function.
-        """
-        self.consumer.commit()
-
     def _close_producer(self):
         with self.producer_lock:
             if self.producer:
@@ -260,6 +244,10 @@ class Connection(object):
 
     @with_reconnect()
     def declare_topic_consumer(self, topics, group=None):
+        # TODO(Support for manual/auto_commit functionality)
+        # When auto_commit is False, consumer can manually notify
+        # the completion of the subscription.
+        # Currently we don't support for non auto commit option
         self.consumer = kafka.KafkaConsumer(
             *topics, group_id=(group or self.group_id),
             bootstrap_servers=self.hostaddrs,
@@ -308,14 +296,6 @@ class KafkaListener(base.PollStyleListener):
     def cleanup(self):
         self.conn.close()
 
-    def commit(self):
-        # TODO(Support for manually/auto commit functionality)
-        # It's better to allow users to commit manually and support for
-        # self.auto_commit = False option. For now, this commit function
-        # is meaningless since user couldn't call this function and
-        # auto_commit option is always True.
-        self.conn.commit()
-
 
 class KafkaDriver(base.BaseDriver):
     """Note: Current implementation of this driver is experimental.