Why Does My MongoDB Go Driver Return \'No Write Concern Mode Named \'majority\' Found\'?

"No Write Concern Mode Named 'majority' Found" Error in MongoDB

Issue:

When attempting to insert an object into MongoDB via a POST request using the MongoDB Go driver, users may encounter the following error:

multiple write errors: [{write errors: []}, {(UnknownReplWriteConcern) No write concern mode named 'majority' found in replica set configuration}]

Cause:

This error indicates that the write concern mode specified in the connection string ('majority' in this case) is not recognized by the MongoDB replica set.

Solution:

To resolve this error, remove the &w=majority parameter from the connection string. The revised connection string should look like this:

mongodb+srv://user:[email protected]/DBname?retryWrites=true

Explanation:

Write concern specifies how MongoDB should handle write operations (e.g., insertions, updates). The majority option requires a majority of the replica set members to acknowledge the write operation before considering it successful. However, if the replica set is not configured to support the majority write concern, the operation will fail.

By removing the &w=majority parameter from the connection string, you are allowing MongoDB to use the default write concern, which does not require acknowledgment from a majority of replica set members. This ensures that write operations will succeed even if not all members have acknowledged them.

Additional Details:

• The write concern mode can be specified as a parameter in the connection string (as in the initial example) or via SetWriteConcern on the mongo.Client object.
• For replica sets, the write concern mode must be supported by the replica set configuration. Consult the MongoDB documentation for more information on configuring write concerns for replica sets.
• The default write concern for unauthenticated clients is majority. Authenticated clients have a default write concern of acknowledged, which is a less strict write concern setting than majority.

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