Remove sleep check when no partitions assigned -- no longer needed

Author: dpkp

kafka/consumer/group.py

@@ -1070,16 +1070,6 @@ def _message_generator(self):
  # like heartbeats, auto-commits, and metadata refreshes
  timeout_at = self._next_timeout()
 
- # Because the consumer client poll does not sleep unless blocking on
- # network IO, we need to explicitly sleep when we know we are idle
- # because we haven't been assigned any partitions to fetch / consume
- if self._use_consumer_group() and not self.assignment():
- sleep_time = max(timeout_at - time.time(), 0)
- if sleep_time > 0 and not self._client.in_flight_request_count():
- log.debug('No partitions assigned; sleeping for %s', sleep_time)
- time.sleep(sleep_time)
- continue
-
  # Short-circuit the fetch iterator if we are already timed out
  # to avoid any unintentional interaction with fetcher setup
  if time.time() > timeout_at: