How to Fix MongoDB Error Code – 79 – UnknownReplWriteConcern
MongoDB is a popular NoSQL database that offers high performance, scalability, and flexibility. However, like any software, it can encounter errors that need to be resolved. One such error is the MongoDB Error Code – 79 – UnknownReplWriteConcern. In this article, we will explore the causes of this error and provide step-by-step instructions on how to fix it.
Understanding the Error
The MongoDB Error Code – 79 – UnknownReplWriteConcern occurs when a write concern specified in a write operation is not recognized by the MongoDB server. Write concerns in MongoDB determine the level of acknowledgment required from the server for a write operation to be considered successful.
When this error occurs, it means that the write concern specified in the operation is not one of the recognized write concerns by the MongoDB server. This can happen due to various reasons, such as using an outdated MongoDB version or specifying an invalid write concern.
Fixing the Error
To fix the MongoDB Error Code – 79 – UnknownReplWriteConcern, follow these steps:
Step 1: Check MongoDB Version
Ensure that you are using a MongoDB version that supports the write concern you are trying to use. MongoDB introduced new write concerns in different versions, so it’s essential to check the compatibility. Refer to the MongoDB documentation for the supported write concerns in your version.
Step 2: Verify Write Concern Syntax
Double-check the syntax of the write concern you are specifying in your write operation. The write concern should follow the correct syntax defined by MongoDB. For example, the default write concern is “w: 1” (acknowledged by the primary), and “w: 0” (unacknowledged) is also a valid option.
Step 3: Update MongoDB Version
If you are using an outdated version of MongoDB that does not support the write concern you need, consider upgrading to a newer version. Upgrading MongoDB ensures that you have access to the latest features, bug fixes, and compatibility with newer write concerns.
Step 4: Use a Supported Write Concern
If you are specifying a custom write concern, ensure that it is one of the supported write concerns by MongoDB. Common write concerns include “majority,” “acknowledged,” “unacknowledged,” and “journaled.” Refer to the MongoDB documentation for a complete list of supported write concerns and their syntax.
Step 5: Test the Write Concern
After making any changes, test the write concern to ensure that the MongoDB Error Code – 79 – UnknownReplWriteConcern is resolved. Perform a write operation and verify that the write concern is acknowledged by the server without any errors.
Summary
In conclusion, the MongoDB Error Code – 79 – UnknownReplWriteConcern can be resolved by ensuring that you are using a compatible MongoDB version, verifying the syntax of the write concern, updating MongoDB if necessary, and using a supported write concern. By following these steps, you can fix this error and continue using MongoDB without any issues.
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