AWS Lambda Timeout Followed by Connection Error - amazon-web-services

Question

I have an AWS Lambda that runs every five minutes. The Lambda will create a connection to an RDS database inside my VPC and run some queries.
The Lambda will successfully run three times, so for about 15 minutes or so, but, then I get a timeout error:
Task timed out after 600.10 seconds
After this timeout error, the next time the Lambda attempts to run, I can no longer connect to my RDS database. I get the following timeout error:
Error: connect ETIMEDOUT
I'm pretty stumped at this point and could use some more eyes on this:
'use strict';
const mysql = require('mysql');
const util = require('util');
const {
fetchQuery,
insertQuery,
updateQuery,
} = require('./queries');
const {
getInsertValues,
getUpdateValues,
} = require('./utils');
const connection = mysql.createConnection({
host: process.env.DB_HOST,
user: process.env.DB_USER,
password: process.env.DB_PASSWORD,
database: process.env.DB_NAME,
});
// node native promisify
const query = util.promisify(connection.query).bind(connection);
connection.connect();
module.exports.scan = async (event, context, callback) => {
let results = await query(fetchQuery);
console.log(`found ${results.length} forms that are scheduled to be filed`);
if (results.length > 0) {
const insertValues = getInsertValues(results);
const updateValues = getUpdateValues(results);
try {
console.log(`creating user_tasks`);
await query(insertQuery, [insertValues]);
console.log(`updating next_scheduled dates`);
await query(updateQuery, [updateValues]);
callback(null, 'successfully updated form next_scheduled')
} catch (err) {
console.error('error creating user_tasks')
callback(err, 'error creating user_tasks')
}
}
}

Answer 1

Try closing the connection to the database once you are done using it, I previously had a similar error because the open connection was keeping the Lambda alive until it got timeout