Question

I use doctrine 2 PDO with mysql.

When stress testing the server, mysql reports a lot of aborted connections (up-to 20%).

I am trying to locate the issue.

Mysql manual suggests to ensure that connections to the database are closed properly.
http://dev.mysql.com/doc/refman/5.0/en/communication-errors.html

I can’t find any information if doctrine actually closes connections or not, or uses persistent connections.

Also, is there anything else that can account for aborted connections? I am at loss here.

PS. Server is ubuntu 10.04, nginx 1.x, php 5.3.5 (fpm) and mysql 5.1.41

Answer 1

From what I’ve observed, Doctrine uses persistent connections.

We’ve stumbled upon a problem, launching unit tests in symfony2, where the database was spammed with connections in “Sleep” status. The solution that worked for us:

$entityManager->getConnection()->close();