PyMongo 事务错误:事务编号只允许在副本集成员或 mongos 上使用 [英] PyMongo transaction error:Transaction numbers are only allowed on a replica set member or mongos
问题描述
当我使用 pymongo 3.7 事务函数连接到 mongo 服务器 4.0 时,出现此错误事务号仅在副本集成员或 mongos 上允许",我找不到任何解决此问题的答案.我的代码是:
When I am using pymongo 3.7 transaction function to connect to mongo server 4.0, this error "Transaction numbers are only allowed on a replica set member or mongos" occurred and I cannot find any answer to solve this problem. My code is:
from pymongo import MongoClient
conn = MongoClient(host, port)
tb = conn.collector_gateway.try_table
with conn.start_session() as session:
with session.start_transaction():
tb.insert_one({"sku": "abc123", "qty": 100}, session=session)
错误是:
Traceback (most recent call last):
File "/Users/yuzgu/PycharmProjects/seller_loss_alert/try_mongo.py", line 22, in <module>
tb.insert_one({"sku": "abc123", "qty": 100}, session=session)
File "/Users/yuzgu/anaconda3/lib/python3.6/site-packages/pymongo/collection.py", line 693, in insert_one
session=session),
File "/Users/yuzgu/anaconda3/lib/python3.6/site-packages/pymongo/collection.py", line 607, in _insert
bypass_doc_val, session)
File "/Users/yuzgu/anaconda3/lib/python3.6/site-packages/pymongo/collection.py", line 595, in _insert_one
acknowledged, _insert_command, session)
File "/Users/yuzgu/anaconda3/lib/python3.6/site-packages/pymongo/mongo_client.py", line 1243, in _retryable_write
return self._retry_with_session(retryable, func, s, None)
File "/Users/yuzgu/anaconda3/lib/python3.6/site-packages/pymongo/mongo_client.py", line 1196, in _retry_with_session
return func(session, sock_info, retryable)
File "/Users/yuzgu/anaconda3/lib/python3.6/site-packages/pymongo/collection.py", line 590, in _insert_command
retryable_write=retryable_write)
File "/Users/yuzgu/anaconda3/lib/python3.6/site-packages/pymongo/pool.py", line 579, in command
unacknowledged=unacknowledged)
File "/Users/yuzgu/anaconda3/lib/python3.6/site-packages/pymongo/network.py", line 150, in command
parse_write_concern_error=parse_write_concern_error)
File "/Users/yuzgu/anaconda3/lib/python3.6/site-packages/pymongo/helpers.py", line 155, in _check_command_response
raise OperationFailure(msg % errmsg, code, response)
pymongo.errors.OperationFailure: Transaction numbers are only allowed on a replica set member or mongos
自从今年发布了mongo事务功能,一直没找到解决办法,有没有人能帮我解决一下这个问题?
Since mongo transaction function was published this year, I couldn't find the solution, can anyone help me with this problem?
推荐答案
事务仅在副本集设置中可用 (https://docs.mongodb.com/master/core/transactions/#transactions-and-replica-sets):
Transactions are only available in a replica set setup (https://docs.mongodb.com/master/core/transactions/#transactions-and-replica-sets):
多文档事务仅适用于副本集.
Multi-document transactions are available for replica sets only.
当您尝试在独立的 mongod
实例上执行事务性操作时,会显示此错误消息.
This error message is shown when you are attempting to do a transactional operation on a standalone mongod
instance.
请参阅交易页面了解更多详情&要求.
Please see Transactions page for more details & requirements.
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