问题描述
我正在尝试使用mongoose进行简单的交易.它在MongoDB Atlas上工作得很好，但是在mlab中，我得到了这样的错误:MongoError: Transaction numbers are only allowed on storage engines that support document-level locking.我做了一些研究，但并没有真正找到有关mlab和document-level locking的任何资源.有人知道如何解决这个问题吗?
I'm trying to do a simple transaction using mongoose. It worked totally fine on MongoDB Atlas, but in mlab I got such an error: MongoError: Transaction numbers are only allowed on storage engines that support document-level locking. I did some research, but didn't really find any resources regarding mlab and document-level locking. Does anyone know how to solve this problem?
推荐答案
我遇到了同样的问题，然后我联系了mlab帮助，这是他们的回复:
该错误表明您的应用程序/驱动程序正在尝试使用与您的共享群集部署不兼容的功能，该功能使用了MMAPv1存储设备.您可能有可重试的写入内容( https://docs.mongodb.com/manual/核心/可重试写入/).您可以尝试在连接字符串( https://docs.mongodb.com/manual/reference/connection-string/#urioption.retryWrites )，还是直接从您的驱动程序设置中获取?
I have same issue, then I contact mlab help, here is their reply:
That error indicates your app/driver is attempting to use a feature that's not compatible with your Shared Cluster deployment, which employs the MMAPv1 storage einge. It's likely that you have retryable writes (https://docs.mongodb.com/manual/core/retryable-writes/) enabled. Can you try turning that feature off in the connection string (https://docs.mongodb.com/manual/reference/connection-string/#urioption.retryWrites), or directly from your driver settings?
如果您在关闭此功能后仍然遇到此错误，请告诉我们.
Please let us know if you continue to experience this error after turning off this feature.
基于此答案，我在mongodb连接url中附加了retryWrites = false，然后运行良好.
Based on this answer, I appended retryWrites=false in mongodb connection url, then it works well.
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