悲伤：池不使用同一类对象python运行

Question

在上下文管理器中产生池并运行。 我创建了一个呼叫一个函数的类的对象，该函数创建池以执行某些操作 当通过该对象调用该函数时，池迭代正常工作，但是使用相同的对象并调用相同的函数崩溃，给出了错误的“池不运行”

实现：

class ETLJob(SomeClass):
    def __init__(self):
        super().__init__()
        self.conf = None
    
    def fetch_data(self):
        """Override the Data Processing Function

        Returns:
            None: Void
        """
        return None

    def transform_data(self):
        """Override the Data Processing Function

        Returns:
            None: Void
        """
        return None

    def ingest_single(self):
        """Override the single Data Point Ingestion Function
        Ingest a single datapoint into the DB using API calls

        Returns:
            None: Void
        """
        return None

    @staticmethod
    def bulk_ingest(func: Callable[[dict], None], conf: list) -> None:
        """Bulk ingest SPIRE harvested data.

        Args:
            func (Callable[[dict], None]): Single data point ingest function
            conf (list): The client and plant configuration list

        Returns:
            None: Since this directly ingest data into DB

        Usage:
        ```py
        self.bulk_ingest(self.ingest_single, self.conf)
        ```
        """
        with ProcessPool(nodes=pathos.helpers.cpu_count() * 2) as pool:
            pool.map(func, conf)
            pool.close()
            pool.join()


if __name__ == "__main__":
    sp = ETLJob()
    sp.bulk_ingest(sp.ingest_single,sp.conf[:10])
    sp.bulk_ingest(sp.ingest_single,sp.conf[20:30])

错误跟踪：

2022-05-20 10:51:29 | [INFO]:root - ERROR ingesting data for Client: 20 Plant: 20 @ Source: spire_actual
 Message: Not able to connect to database either client id is wrong or not found.
2022-05-20 10:51:29 | [INFO]:root - ERROR ingesting data for Client: 20 Plant: 18 @ Source: spire_actual
 Message: Not able to connect to database either client id is wrong or not found.
2022-05-20 10:51:29 | [INFO]:root - ERROR ingesting data for Client: 20 Plant: 17 @ Source: spire_actual
 Message: Not able to connect to database either client id is wrong or not found.
2022-05-20 10:51:29 | [INFO]:root - ERROR ingesting data for Client: 20 Plant: 19 @ Source: spire_actual
 Message: Not able to connect to database either client id is wrong or not found.
2022-05-20 10:51:30 | [INFO]:root - ERROR ingesting data for Client: 20 Plant: 21 @ Source: spire_actual
 Message: Not able to connect to database either client id is wrong or not found.
Traceback (most recent call last):
  File "/home/kayvan/projects/weather-repo/weather_combiner/data_pipelines/spire.py", line 596, in <module>
    s.bulk_ingest(s.ingest_single, s.conf[30:35])
  File "/home/kayvan/projects/weather-repo/weather_combiner/data_pipelines/spire.py", line 189, in bulk_ingest
    pool.map(func, conf)
  File "/home/kayvan/projects/weather/lib/python3.9/site-packages/pathos/multiprocessing.py", line 139, in map
    return _pool.map(star(f), zip(*args)) # chunksize
  File "/home/kayvan/projects/weather/lib/python3.9/site-packages/multiprocess/pool.py", line 364, in map
    return self._map_async(func, iterable, mapstar, chunksize).get()
  File "/home/kayvan/projects/weather/lib/python3.9/site-packages/multiprocess/pool.py", line 473, in _map_async
    self._check_running()
  File "/home/kayvan/projects/weather/lib/python3.9/site-packages/multiprocess/pool.py", line 350, in _check_running
    raise ValueError("Pool not running")
ValueError: Pool not running