potiuk commented on a change in pull request #6725: [AIRFLOW-6157] Support for 
multiple executors
URL: https://github.com/apache/airflow/pull/6725#discussion_r353706504
 
 

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 File path: airflow/executors/multiple_executors.py
 ##########
 @@ -0,0 +1,117 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+"""Multiple  executor."""
+from itertools import chain
+from typing import Any, Dict, Iterable, Optional, Set
+
+from airflow.executors.base_executor import BaseExecutor, 
BaseExecutorProtocol, CommandType
+from airflow.models import TaskInstance
+from airflow.models.taskinstance import SimpleTaskInstance, TaskInstanceKeyType
+
+
+class MultipleExecutors(BaseExecutorProtocol):
+    """
+    This executor can run multiple executors under the hood.
+    """
+    def __init__(self, main_executor: BaseExecutor, additional_executors_dict: 
Dict[str, BaseExecutor]):
+        super().__init__()
+        self.main_executor = main_executor
+        self.additional_executors_dict = additional_executors_dict
+        self.executor_set: Set[BaseExecutor] = 
set(additional_executors_dict.values())
+        self.executor_set.add(main_executor)
+        self.log.info("Multiple executor")
+        self.log.info("Main executor %s", str(main_executor))
+        self.log.info("Additional executor dict %s", 
str(self.additional_executors_dict))
+        self.log.info("Executor set %s", str(self.executor_set))
+
+    def _get_executor_for_queue(self, queue: Optional[str]) -> BaseExecutor:
+        executor = None
+        if queue:
+            executor = self.additional_executors_dict.get(queue)
+        return self.main_executor if not executor else executor
+
+    def start(self):
+        for executor in self.executor_set:
+            executor.start()
+
+    def has_task(self, task_instance: TaskInstance) -> bool:
+        executor = self._get_executor_for_queue(task_instance.queue)
+        return executor.has_task(task_instance=task_instance)
+
+    def sync(self) -> None:
+        for executor in self.executor_set:
+            executor.sync()
 
 Review comment:
   sure. We can set variable and make single return :)

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