cakePHP + php5-fpm + memcached =很多开放的TCP连接到memcached？

Question

I'm pretty sure this is a CakePHP bug, but figured someone here may have run across this and know how to fix. FYI - I've created a ticket.

I run PHP as fastcgi under nginx via php5-fpm. When I use 'Memcache' as the engine for my cake cache, I notice that TCP connections are not closed. I notice that cake's MemcacheEngine does not ever call PHP memcache::close().

For people who run PHP under non-fastcgi processes, I think this is OK as at the end of the PHP request the process ends, and "breaks" the TCP connection between PHP and memcached.

Using php5-fpm this is not the case, as the PHP process stays running to be re-used.

Does anyone know a best practice for this? I'm thinking of modifying the CakePHP code to close the connection at the end of processing - but I'm wondering if there is a better way.

Note: CakePHP's MemcacheEngine does NOT use pconnect.

My version info:

Ubuntu 10.10 64bit
PHP 5.3.3
PECL memcache 3.0.5
memcached 1.4.5
cakephp 1.3.8

Answer 1

Turns out MemcacheEngine uses Memcache::addServer() which by default uses persistence. It is correctly re-using the connections between my FPM children and my memcached pool.

Cake has added a 'persistent' option now, to allow the overriding of the default behavior for those that wish: http://cakephp.lighthouseapp.com/projects/42648/tickets/1705-cake-138-memcacheengine-does-not-close-connection