diff --git a/core/mq/kafka/kafka_consumer.py b/core/mq/kafka/kafka_consumer.py
index 06c5e0b0..c015cf88 100644
--- a/core/mq/kafka/kafka_consumer.py
+++ b/core/mq/kafka/kafka_consumer.py
@@ -42,21 +42,6 @@ def __init__(self, config: Dict[str, Any], loop: AbstractEventLoop):
         self._consumer = AIOKafkaConsumer(**conf, loop=loop)
         loop.run_until_complete(self._consumer.start())
 
-    def on_assign_offset_end(self, consumer: AIOKafkaConsumer, partitions: List[TopicPartition]) -> None:
-        for p in partitions:
-            p.offset = consumer.last_stable_offset(p)
-        self.on_assign_log(consumer, partitions)
-        try:
-            consumer.assign(partitions)
-        except KafkaError as e:
-            self._error_callback(e)
-
-    def on_coop_assign_offset_end(self, consumer: AIOKafkaConsumer, partitions: List[TopicPartition]) -> None:
-        for p in partitions:
-            p.offset = consumer.last_stable_offset(p)
-        self.on_assign_log(consumer, partitions)
-        consumer.assign(consumer.assignment().update(partitions))
-
     def on_assign_log(self, consumer: AIOKafkaConsumer, partitions: List[TopicPartition]) -> None:
         log_level = "WARNING"
         params = {
@@ -77,19 +62,11 @@ def subscribe(self, topics: Optional[Iterable[str]] = None) -> None:
         try:
             self._consumer.subscribe(topics, listener=CoreConsumerRebalanceListener(
                 consumer=self._consumer,
-                on_assign_callback=(self.get_on_assign_callback() if self.assign_offset_end
-                                    else self.on_assign_log)
+                on_assign_callback=self.on_assign_log
             ))
         except KafkaError as e:
             self._error_callback(e)
 
-    def get_on_assign_callback(self) -> Callable[[AIOKafkaConsumer, List[TopicPartition]], None]:
-        if "cooperative" in self._config["conf"].get("partition_assignment_strategy", ""):
-            callback = self.on_coop_assign_offset_end
-        else:
-            callback = self.on_assign_offset_end
-        return callback
-
     def unsubscribe(self) -> None:
         self._consumer.unsubscribe()