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How to Fix MySQL Error – ER_SYNC_MASTER_REJECTED_MTS_SQL_THD_FAILED

How to Fix MySQL Error – ER_SYNC_MASTER_REJECTED_MTS_SQL_THD_FAILED

MySQL is a popular open-source relational database management system used by many websites and applications. However, like any software, it can encounter errors that can disrupt its normal operation. One such error is the ER_SYNC_MASTER_REJECTED_MTS_SQL_THD_FAILED error. In this article, we will explore what this error means and how to fix it.

Understanding the ER_SYNC_MASTER_REJECTED_MTS_SQL_THD_FAILED Error

The ER_SYNC_MASTER_REJECTED_MTS_SQL_THD_FAILED error occurs when a multi-threaded slave thread fails to execute a transaction on the master server. This error typically happens in a replication setup where there is a master-slave relationship between multiple MySQL servers.

When a transaction is executed on the master server, it is replicated to the slave server(s) to ensure data consistency. However, if the slave server encounters an error while executing the transaction, it rejects it and throws the ER_SYNC_MASTER_REJECTED_MTS_SQL_THD_FAILED error.

Possible Causes of the ER_SYNC_MASTER_REJECTED_MTS_SQL_THD_FAILED Error

There can be several reasons why this error occurs. Some common causes include:

  • Network Issues: If there are network connectivity problems between the master and slave servers, the replication process can be disrupted, leading to this error.
  • Insufficient Resources: If the slave server does not have enough resources (CPU, memory, disk space) to handle the replication workload, it may fail to execute transactions and trigger this error.
  • Configuration Mismatch: Incorrect configuration settings on the master or slave servers can cause replication issues and result in the ER_SYNC_MASTER_REJECTED_MTS_SQL_THD_FAILED error.

Fixing the ER_SYNC_MASTER_REJECTED_MTS_SQL_THD_FAILED Error

Here are some steps you can take to resolve the ER_SYNC_MASTER_REJECTED_MTS_SQL_THD_FAILED error:

1. Check Network Connectivity

Ensure that there are no network connectivity issues between the master and slave servers. Test the connection using tools like ping or telnet to verify that they can communicate with each other.

2. Verify Resource Availability

Check the resource usage on the slave server. Ensure that it has enough CPU, memory, and disk space to handle the replication workload. If necessary, allocate more resources or optimize the server configuration.

3. Review Configuration Settings

Double-check the configuration settings on both the master and slave servers. Pay attention to parameters related to replication, such as server IDs, log file paths, and replication filters. Make sure they are correctly set and match between the servers.

4. Check Replication Status

Use MySQL commands like SHOW SLAVE STATUS or SHOW MASTER STATUS to check the replication status. Look for any error messages or warnings that can provide insights into the cause of the error. Fix any issues found based on the error messages.

5. Restart Replication

If all else fails, you can try restarting the replication process. Stop the slave server, reset the replication settings, and start the replication again. This can sometimes resolve temporary issues causing the ER_SYNC_MASTER_REJECTED_MTS_SQL_THD_FAILED error.

Summary

The ER_SYNC_MASTER_REJECTED_MTS_SQL_THD_FAILED error can be a frustrating issue in a MySQL replication setup. However, by following the steps outlined in this article, you can troubleshoot and resolve the error effectively.

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