Bug #39387 Connect sometimes fails when server load is high
Submitted: 11 Sep 2008 9:22 Modified: 12 Oct 2008 11:31
Reporter: Nalle Jacobsson Email Updates:
Status: No Feedback Impact on me:
None 
Category:Connector / NET Severity:S1 (Critical)
Version:5.1.7 OS:Windows
Assigned to: CPU Architecture:Any
Tags: connect, fail, hosts

[11 Sep 2008 9:22] Nalle Jacobsson 
Description:
After upgrading from 5.1.4 to 5.1.7, my web app started reporting errors when connecting to the db-server:

MySql.Data.MySqlClient.MySqlException: Unable to connect to any of the specified MySQL hosts. ---> System.Exception: Exception of type 'System.Exception' was thrown.
   at MySql.Data.MySqlClient.NativeDriver.Open()

The error occurs mostly when web server load is high, it occurs several times per second. Goes away for a couple of minutes and comes back. After downgrading to 5.1.4 the problem is gone.

How to repeat:
It's repeatable in my production environment by switching between 5.1.4 and 5.1.7,  don't know how to repeat it otherwise though.

Suggested fix:
Downgrading to 5.1.4 fixed the problem.
[12 Sep 2008 11:31] Tonci Grgin 
Hi Nalle and thanks for your report. Now, I wonder what to do with it... Any ideas (besides logging into your production system, for that you need support contract)?
[12 Oct 2008 23:00] Bugs System 
No feedback was provided for this bug for over a month, so it is
being suspended automatically. If you are able to provide the
information that was originally requested, please do so and change
the status of the bug back to "Open".