Fixed Issue 1033.Raise AssertionError when decompression unsupported. (#1159)

Author: bts-webber

kafka/consumer/fetcher.py

@@ -122,6 +122,7 @@ def send_fetches(self):
             if self._client.ready(node_id):
                 log.debug("Sending FetchRequest to node %s", node_id)
                 future = self._client.send(node_id, request)
+                future.error_on_callbacks=True
                 future.add_callback(self._handle_fetch_response, request, time.time())
                 future.add_errback(log.error, 'Fetch to node %s failed: %s', node_id)
                 futures.append(future)
@@ -550,6 +551,12 @@ def _unpack_message_set(self, tp, messages):
             log.exception('StopIteration raised unpacking messageset: %s', e)
             raise Exception('StopIteration raised unpacking messageset')
 
+        # If unpacking raises AssertionError, it means decompression unsupported
+        # See Issue 1033
+        except AssertionError as e:
+            log.exception('AssertionError raised unpacking messageset: %s', e)
+            raise
+
     def __iter__(self):  # pylint: disable=non-iterator-returned
         return self