Small KafkaClient.check_version() improvements

- filter connection failure logging during version check
  - raise UnrecognizedBrokerVersion if we cant id broker

kafka/client_async.py

@@ -586,6 +586,15 @@ class KafkaClient(object):
             OffsetFetchRequest_v0, GroupCoordinatorRequest)
         from .protocol.metadata import MetadataRequest
 
+        # Socket errors are logged as exceptions and can alarm users. Mute them
+        from logging import Filter
+        class ConnFilter(Filter):
+            def filter(self, record):
+                if record.funcName in ('recv', 'send'):
+                    return False
+                return True
+        log_filter = ConnFilter()
+
         test_cases = [
             ('0.9', ListGroupsRequest()),
             ('0.8.2', GroupCoordinatorRequest('kafka-python-default-group')),
@@ -593,18 +602,20 @@ class KafkaClient(object):
             ('0.8.0', MetadataRequest([])),
         ]
 
+        logging.getLogger('kafka.conn').addFilter(log_filter)
         for version, request in test_cases:
             connect()
             f = self.send(node_id, request)
-            time.sleep(0.5)
-            self.send(node_id, MetadataRequest([]))
+            time.sleep(0.1) # HACK: sleeping to wait for socket to send bytes
+            metadata = self.send(node_id, MetadataRequest([]))
             self.poll(future=f)
+            self.poll(future=metadata)
 
             assert f.is_done
 
             if f.succeeded():
                 log.info('Broker version identifed as %s', version)
-                return version
+                break
 
             if six.PY2:
                 assert isinstance(f.exception.args[0], socket.error)
@@ -615,6 +626,12 @@ class KafkaClient(object):
                      version, request.__class__.__name__)
             continue
 
+        else:
+            raise Errors.UnrecognizedBrokerVersion()
+
+        logging.getLogger('kafka.conn').removeFilter(log_filter)
+        return version
+
     def wakeup(self):
         os.write(self._wake_w, b'x')
 

kafka/common.py

@@ -132,6 +132,10 @@ class StaleMetadata(KafkaError):
     invalid_metadata = True
 
 
+class UnrecognizedBrokerVersion(KafkaError):
+    pass
+
+
 class BrokerResponseError(KafkaError):
     errno = None
     message = None