Why Does My Node.js MySQL Connection Throw 'read ECONNRESET' After Idle Time?

Troubleshooting "read ECONNRESET" Error in MySQL After Node.js Server Idle Time

Problem Overview

When a Node.js server connects to MySQL via the node-mysql module and is left idle for a long duration, the first subsequent query often results in a "read ECONNRESET" error. This error suggests a connection drop between Node and MySQL.

Questions and Answers

1. Connection Lifetime Limitation?

Answer: Yes, MySQL has a "wait_timeout" variable that disconnects idle connections after a certain time (default: 8 hours).

2. Graceful Disconnection Handling by Connection Pools?

Answer: Node-mysql's connection pools do not automatically prune disconnected connections. A heartbeat or node-pool's idleTimeoutMillis option can be used to maintain connection availability.

3. Troubleshooting Beyond MySQL?

Answer: While the error is commonly associated with MySQL, it's advisable to rule out other potential causes such as network issues or Node.js code affecting the connection.

Solutions

• Extend MySQL "wait_timeout": Increase the MySQL timeout to prevent connection pruning.
• Implement a Heartbeat: Use a query like "SELECT 1;" on an interval to maintain an active connection and prevent disconnection.
• Configure node-pool's "idleTimeoutMillis": Automatically prune idle connections using the node-pool module.

Additional Information

The error can also be caused by:

• Network connectivity issues between Node and MySQL servers.
• High load or latency impacting the MySQL server.

The above is the detailed content of Why Does My Node.js MySQL Connection Throw 'read ECONNRESET' After Idle Time?. For more information, please follow other related articles on the PHP Chinese website!