Edit report at https://bugs.php.net/bug.php?id=46740&edit=1
ID: 46740
Comment by: justice dot libra dot boyz at gmail dot com
Reported by: php at matthewboehm dot com
Summary: PHP Not Cleanly Closing MySQL Connections on Apache
Death
Status: Open
Type: Bug
Package: PDO related
Operating System: RHEL5.2
PHP Version: 5.2.9
Block user comment: N
Private report: N
New Comment:
yeah i found same problem using 5.2.9.9..
any patch from inside php engine guys?
Previous Comments:
------------------------------------------------------------------------
[2009-07-08 16:18:59] dmlance at gmail dot com
Same problem with 2.2.11 and 5.2.10.
Due high load on my server with croned scripts I got about 60% aborted
connections in my logs.
------------------------------------------------------------------------
[2009-04-01 14:34:46] dstuff at brainsware dot org
Got the same problem using PHP version 5.2.9 on Debian (Lenny)
------------------------------------------------------------------------
[2008-12-03 15:45:59] php at matthewboehm dot com
Description:
------------
When using PHP/MySQL with persistent connections, upon the death of
an apache child, you get an 'aborted connection' message inside the
MySQL server's error log.
In my supremely most humbled opinion, I can only presume that PHP is
not cleanly closing opened MySQL connections when an apache child
dies and the PHP module is unloaded from apache's memory.
Reproduce code:
---------------
To reproduce:
1. Start httpd (I used 2.2.10) with PHP 5.2.6. httpd should use the prefork
MPM with the following settings on the MPM:
StartServers 5
MinSpareServers 5
MaxSpareServers 10
MaxRequestsPerChild 1000
2. Browser the following PHP file several times to initiate several persistent
connections to your MySQL database. This can be either of the MySQL methods
that support persistence. (mysql_pconnect, and PDO)
<?php
try
{
$dbh = new PDO('mysql:host=DBHOST;dbname=DBNAME', 'DBUSER', 'DBPASS',
array(PDO::ATTR_PERSISTENT => true, PDO::ATTR_ERRMODE =>
PDO::ERRMODE_EXCEPTION));
if($res = $dbh->query("SELECT * FROM myTable"))
{
print "Query success";
}
else
{
print "Query failed";
}
}
catch(PDOException $e)
{
echo 'Error: ' . $e->getMessage();
}
3. Stop apache via any means. You will see in your MySQL log 1 aborted
connection line for each terminated apache process.
In my testing, I used 'ab' to throw 10,000 requests of the above code at
apache. Every 1000 requests, I would see the error in MySQL. This is because of
the MaxRequestsPerChild setting to be 1000. Every 1000, an apache thread will
suicide and then spawn a new thread.
Once the load test was complete, if more than MaxSpareServers threads where
running, apache would kill them off as well and you would see that same number
of errors in MySQL.
Expected result:
----------------
I would not expect to see any errors from MySQL. I would expect all
connections to be properly closed upon the death of an apache
process.
Actual result:
--------------
The actual result is an incorrectly closed MySQL connection.
------------------------------------------------------------------------
--
Edit this bug report at https://bugs.php.net/bug.php?id=46740&edit=1
