Session persistence failure under transaction callback with large Bulk ops

Creating operations

Starting transaction with 50 operations

Start session 47181c6e-ab0a-42a2-a8b1-7c334556e057

Synthetic op to start transaction

Attempting bulk write of 50 operations

Inside transaction 1

Traceback (most recent call last):

  File "bulk_transactions.py", line 84, in <module>

    session.with_transaction(

  File "/usr/local/lib/python3.9/site-packages/pymongo/client_session.py", line 620, in with_transaction

    ret = callback(self)

  File "bulk_transactions.py", line 72, in perform_operation

    res = coll.bulk_write(ops, ordered=False, session=s)

  File "/usr/local/lib/python3.9/site-packages/pymongo/collection.py", line 508, in bulk_write

    bulk_api_result = blk.execute(write_concern, session)

  File "/usr/local/lib/python3.9/site-packages/pymongo/bulk.py", line 529, in execute

    return self.execute_command(generator, write_concern, session)

  File "/usr/local/lib/python3.9/site-packages/pymongo/bulk.py", line 360, in execute_command

    client._retry_with_session(

  File "/usr/local/lib/python3.9/site-packages/pymongo/mongo_client.py", line 1438, in _retry_with_session

    return self._retry_internal(retryable, func, session, bulk)

  File "/usr/local/lib/python3.9/site-packages/pymongo/mongo_client.py", line 1470, in _retry_internal

    return func(session, sock_info, retryable)

  File "/usr/local/lib/python3.9/site-packages/pymongo/bulk.py", line 354, in retryable_bulk

    self._execute_command(

  File "/usr/local/lib/python3.9/site-packages/pymongo/bulk.py", line 310, in _execute_command

    result, to_send = bwc.execute(ops, client)

  File "/usr/local/lib/python3.9/site-packages/pymongo/message.py", line 950, in execute

    result = self.write_command(request_id, msg, to_send)

  File "/usr/local/lib/python3.9/site-packages/pymongo/message.py", line 1042, in write_command

    reply = self.sock_info.write_command(request_id, msg)

  File "/usr/local/lib/python3.9/site-packages/pymongo/pool.py", line 798, in write_command

    helpers._check_command_response(result, self.max_wire_version)

  File "/usr/local/lib/python3.9/site-packages/pymongo/helpers.py", line 167, in _check_command_response

    raise OperationFailure(errmsg, code, response, max_wire_version)

pymongo.errors.OperationFailure: txnNumber 1 for session 47181c6e-ab0a-42a2-a8b1-7c334556e057 - 47DEQpj8HBSa+/TImW+5JCeuQeRkm5NMpJWZG3hSuFU= already started, full error: {'ok': 0.0, 'errmsg': 'txnNumber 1 for session 47181c6e-ab0a-42a2-a8b1-7c334556e057 - 47DEQpj8HBSa+/TImW+5JCeuQeRkm5NMpJWZG3hSuFU= already started', 'code': 117, 'codeName': 'ConflictingOperationInProgress', 'operationTime': Timestamp(1632202332, 1), '$clusterTime': {'clusterTime': Timestamp(1632202332, 1), 'signature': {'hash': b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00', 'keyId': 0}}}