Bug Php ZendFrameWork – Memcached Tweet
septiembre 30, 2010 Publicado en Admin-tips, Escalabilidad, InfraEstructura con 39 Comentarios
Tengo varias aplicaciones que hacen uso del aplicativo memcached y las cuales se estaban comportando de manera extraña, donde al hacer una modificación de información e invalidar la llave de memcached, la información parecia no ser actualizada.
Lo primero que hice fue aislar el aplicativo para que solo utilizara un servidor de BackEnd, y que este a su vez utilizara unicamente un servidor de Memcached, para poder monitorear de manera controlada el comportamiento de la aplicación.
Una vez aislada la aplicación, ingrese mensajes de debug en el error_log del apache, donde imprimia en la primer linea la operación que estaba realizando, en la segunda linea el valor devuelto por el servidor de memcached y por ultimo el MD5 del key que se almacena en memcached, este era el resultado:
[Thu Sep 30 11:25:09 2010] [error] [client X.X.X.X] REMOVE CACHE, referer: http://myhost.com/somepath/to/my/app
[Thu Sep 30 11:25:09 2010] [error] [client X.X.X.X] 0, referer: http://myhost.com/somepath/to/my/app
[Thu Sep 30 11:25:09 2010] [error] [client X.X.X.X] e81afd654486c19cb137475a687c7f5e
Despues de ver esto se puede evidenciar que el valor devuelto por el aplicativo era cero (0) o false, lo cual indicaba que no estaba realizando la operación de borrado de la información.
Para verificar la información en el servidor de memcached, me conecte por consola y solicite el valor del key antes y despues de modificar un dato en la aplicación web, evidenciando que el dato permanecia intacto en memcached y no era actualizado, por lo tanto el efecto en la aplicación web era que no se estaba actualizando la información, aun cuando en la BD estaba de manera correcta. Para verificar por consola en memcached nos debemos conectar por telnet al puerto definido en la instalación:
[user@webserver ~]$ telnet 192.168.1.XXX 22522
Trying 192.168.1.XXX…
Connected to 192.168.1.XXX (192.168.1.XXX).
Escape character is ‘^]’.
get e81afd654486c19cb137475a687c7f5e
VALUE e81afd654486c19cb137475a687c7f5e 1 49
a:3:{i:0;s:5:”i:11;”;i:1;i:1285880685;i:2;i:300;}
END
Al ver este comportamiento investigue primero en el framework de Zend, en la libreria para trabajar con Memcache, en la funcion “remove” que era la que estaba fallando, alli pude ver que ZendFramework lo que realiza es un llamado a la función “delete” de la clase memcache de PHP.
Investigando en el sitio web de php, http://www.php.net/manual/es/memcache.delete.php, encontre que se trata de un Bug que se presenta en esta función donde recibe un segundo parametro “Opcional” especificando el tiempo en el cual se debe borrar el key, al parecer no resulto ser tan “Opcional” y para que funcione debe especificarse siempre.
Por tal motivo, tuve que editar el archivo de ZendFramework, ZendFramework-1.7.8/library/Zend/Cache/Backend/Memcached.php
ANTES
public function remove($id)
{
return $this->_memcache->delete($id);
}DESPUES
public function remove($id)
{
return $this->_memcache->delete($id, 0);
}
adicionando ese segundo paramétro en cero (0), se soluciona el inconveniente y vuelve a trabajar de manera adecuada el servidor de memcached.
NOTA: Esto sucede con ZendFramework inferior a la versión 1.10.X + pecl-memcache 3.0.4 + memcached 1.4.4
Tags: bug, memcache, php, ZendFramework
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