uranusjr commented on a change in pull request #20286:
URL: https://github.com/apache/airflow/pull/20286#discussion_r783658006



##########
File path: airflow/models/taskinstance.py
##########
@@ -2128,6 +2138,14 @@ def set_duration(self) -> None:
             self.duration = None
         self.log.debug("Task Duration set to %s", self.duration)
 
+    def _record_task_map_for_downstreams(self, value: Any, *, session: 
Session) -> None:
+        if not self.task.has_mapped_dependants():
+            return
+        if not isinstance(value, collections.abc.Collection) or 
isinstance(value, (bytes, str)):
+            self.log.info("Failing %s for unmappable XCom push %r", self.key, 
value)
+            raise UnmappableXComPushed(value)

Review comment:
       Changed both logging and exception to only include the variable type 
instead.




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