Why Am I Getting 'read ECONNRESET' Error on Idle Node.js Server Connected to MySQL?

MySQL "read ECONNRESET" Error on Idle Node.js Server: Causes and Solutions

Introduction

Connecting a Node.js server to MySQL via the node-mysql module can face challenges when idle time leads to read ECONNRESET errors.

Question 1: Connection Disconnections

Yes, the issue appears to stem from MySQL pruning idle connections due to its wait_timeout setting. The default 8-hour limit can expire after leaving the server idle for several hours.

Question 2: Connection Pool Limitations

While node-mysql manages connection pools, it may not detect disconnections until a query is attempted. This design flaw makes the error unavoidable on the first post-idle query.

Question 3: External Causes

While read ECONNRESET errors are common, it's worth considering other potential causes. However, further investigations indicate a MySQL timeout issue rather than external factors.

Resolution

1. Increase MySQL Timeout:

Set the MySQL wait_timeout variable to a larger value (e.g., 28800 seconds for 8 hours) to prevent connection pruning.

2. Use Heartbeat Queries:

Execute a periodic query (e.g., SELECT 1;) to keep the connection alive and prevent pruning.

3. Implement Idle Connection Pruning:

Employ the node-pool module with its idleTimeoutMillis option to automatically prune idle connections.

Conclusion

By addressing the MySQL timeout setting and enhancing connection handling in node-mysql, developers can mitigate read ECONNRESET errors on idle Node.js servers. Considering potential external causes is also prudent, but in this case, MySQL's wait_timeout appears to be the primary culprit.

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