1. Introduction
Error Code 13435 – NotMasterNoSlaveOk is an error that commonly appears in MongoDB, a cross-platform document-oriented database program. Users are most likely to encounter this error when they attempt to perform a query on a secondary mongoose instance in a MongoDB database cluster.
2. What Does Error Code 13435 – NotMasterNoSlaveOk Mean?
Error code 13435 – NotMasterNoSlaveOk typically indicates that the mongoose instance in question is neither a master nor a slave in the MongoDB cluster. For non-technical readers, a master-slave configuration refers to a communication mode between two devices where one device is in control (master) and the other(s) respond(s) (slave). If you encounter this error, that could mean the connection was made with a non-primary node, but no secondary node has been flagged for these types of connections.
3. What Causes This Error?
It’s important to identify the reasons behind the error to rectify it effectively. The common reasons for this error are:
– The application is connecting to a non-primary node in the replica set and is trying to read or write.
– The slaveOk flag isn’t set. The slaveOk flag makes it possible to perform read operations on the replica members of the replica set.
– Incorrect configuration in the replica set up.
4. How to Fix Error Code 13435 – NotMasterNoSlaveOk
Fix #1: Connect to a Primary Node.
Begin by ensuring your application connects to a primary node in a replica set. If it’s not, shift the connection to a primary node.
Fix #2: Set the SlaveOk Flag.
You should consider setting the slaveOk flag which lets your MongoDB instance communicate with non-primary nodes in the replica set. Simply run the command: db.setSlaveOk() in your MongoDB shell to do this.
Fix #3: Check the Cluster Configuration
Ensure that the replica set is correctly configured. You may need to reconfigure your MongoDB replica set if the current setup is causing the issue.
5. Additional Tips
Always ensure that your MongoDB cluster is correctly configured. Official MongoDB documentation is a valuable resource for any configuration issues.
6. When to Contact Support
If the provided solutions do not work, or if you’re unsure about the technicalities, it’s best to contact MongoDB support directly or consult a professional.
7. Conclusion
In conclusion, Error Code 13435 – NotMasterNoSlaveOk is a relatively common error experienced by MongoDB users. The primary solutions involve correcting the database configuration, connecting to a primary node, or setting the slaveOk flag. With both preventive measures and troubleshooting steps, it is quite manageable. Always remember, you’re not alone in this.