andrewgodwin commented on a change in pull request #18112:
URL: https://github.com/apache/airflow/pull/18112#discussion_r705604901



##########
File path: airflow/exceptions.py
##########
@@ -256,12 +278,21 @@ def __init__(
         self.method_name = method_name
         self.kwargs = kwargs
         self.timeout = timeout
+
         # Check timeout type at runtime
         if self.timeout is not None and not hasattr(self.timeout, 
"total_seconds"):
             raise ValueError("Timeout value must be a timedelta")
 
+        # Check keyword arguments
+        if kwargs:
+            if method_name is None:
+                raise ValueError("Keyword arguments not allowed when method is 
not specified")

Review comment:
       > don't know about or want to know about deferred tasks
   
   Wait, so you're injecting deferral into operators via the pre_execute hook 
that otherwise may not expect it? I would be wary of doing that, there might be 
side-effects from operators that do too much in their own init or pre-execute 
code...




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