Memcached distributed problem

cbccharlie's picture

Hi,

I have a drupal installation with two frontend servers, which have a memcached server in each. If I'm surfing the frontend 1 and the frontend 2 memcached goes down, the page stops loading correctly. Has anyone ever had this problem?

Thank you very much.

Comments

What is memcache configuration?

kbahey's picture

Do you use "consistent" for the hash strategy in your php.ini

memcache.hash_strategy=consistent

http://www.php.net/manual/en/memcache.ini.php#ini.memcache.hash-strategy

This is now the default (I think starting with PHP 5.5), but that is not the case with older version.

Drupal performance tuning, development, customization and consulting: 2bits.com, Inc..
Personal blog: Baheyeldin.com.

Thank you very much, but I

cbccharlie's picture

Thank you very much, but I already have turned this property for PECL memcached (memcached.sess_consistent_hash = On)

I use PHP Version 5.3.3.

What about settings.php?

kbahey's picture

What about settings.php?

Is it the same on each application server? Do you list more than one memcache instance, by the same IP address?

For example:

$conf['memcache_servers']    = array(
  '10.0.0.11:11211' => 'default',
  '10.0.0.12:11211' => 'default',
);

Drupal performance tuning, development, customization and consulting: 2bits.com, Inc..
Personal blog: Baheyeldin.com.

My config

cbccharlie's picture

My config is:

$conf['memcache_servers'] = array(
  '192.168.130.222:11211' => 'default',
  '192.168.130.224:11211' => 'default',
);

Some things to check...

FluxSauce's picture

Are you sure that the application isn't sharing the same memcached configuration for one server? Have you checked the usage of the two memcached servers?

Are you using a memcached cluster? If not, why do you have two distinct servers for the same application? If distinct, that's making your caching backend do twice the work.

I use a distributed

cbccharlie's picture

I use a distributed memcached.

My server config is:

$conf['memcache_servers'] = array(
'192.168.130.222:11211' => 'default',
'192.168.130.224:11211' => 'default',
);
$conf['memcache_options'] = array(
Memcached::OPT_DISTRIBUTION => Memcached::DISTRIBUTION_CONSISTENT,
);

Thank you very much.

PHP memcached vs. PHP memcache

kbahey's picture

So, you are using the memcached PECL package, not memcache (without a "d").

I have seen issues with it a while back.

Try going with the memcache package instead and add the hash_strategy=consistent to php.ini, and see if it makes a difference.

Drupal performance tuning, development, customization and consulting: 2bits.com, Inc..
Personal blog: Baheyeldin.com.

I tried memcache package and

cbccharlie's picture

I tried memcache package and now the site load properly, although a node is stopped.
Thank you very much for everything.

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