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How to fix MongoDB Error Code – 150 – StaleEpoch

How to Fix MongoDB Error Code – 150 – StaleEpoch

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 MongoDB Error Code – 150, also known as StaleEpoch. In this article, we will explore what this error means and how to fix it.

Understanding MongoDB Error Code – 150 – StaleEpoch

When working with a MongoDB replica set, each replica set member has a unique identifier called an epoch. The epoch is a monotonically increasing number that helps in determining the most up-to-date data. MongoDB uses the epoch to ensure data consistency and prevent stale data from being read or written.

The StaleEpoch error occurs when a replica set member detects that its epoch is lower than the epoch of the primary member. This indicates that the member is out of sync with the primary and needs to catch up to the latest data.

Fixing MongoDB Error Code – 150 – StaleEpoch

Here are the steps to fix the StaleEpoch error:

Step 1: Identify the Affected Replica Set Member

The first step is to identify the replica set member that is experiencing the StaleEpoch error. You can check the MongoDB logs or use the rs.status() command in the MongoDB shell to get the status of each member in the replica set.

rs.status()

This command will display the status of each member, including their epochs.

Step 2: Resync the Affected Replica Set Member

Once you have identified the affected replica set member, you need to resync it with the primary member. To do this, follow these steps:

  1. Stop the MongoDB service on the affected member.
  2. Delete the data files associated with the affected member.
  3. Start the MongoDB service on the affected member.
  4. Add the member back to the replica set using the rs.add() command in the MongoDB shell.
rs.add("hostname:port")

Replace “hostname:port” with the actual hostname and port of the affected member.

Step 3: Verify the Fix

After resyncing the affected replica set member, you should verify that the StaleEpoch error is resolved. Check the MongoDB logs and use the rs.status() command to ensure that the member has caught up with the primary and has the same epoch.

Summary

In conclusion, MongoDB Error Code – 150, or StaleEpoch, occurs when a replica set member is out of sync with the primary member. To fix this error, you need to identify the affected member, resync it with the primary, and verify the fix. If you encounter any issues or need assistance with MongoDB or VPS hosting, consider reaching out to Server.HK, a leading VPS hosting provider that offers reliable and high-performance solutions.