How to clear Doctrine APC cache for production?

symfony caching doctrine-orm apc apcu
pmoubed picture pmoubed · Oct 11, 2016 · Viewed 7.1k times · Source

I have this issue when I add a column to one of my entities and release it for production I have to restart Apache in order to clear Doctrine metadata APC/APCU cache.

I have tried all commands below but none worked for me:

php -r "apc_clear_cache();"
php -r "apcu_clear_cache();"

sudo php app/console doctrine:cache:clear-metadata
sudo php app/console doctrine:cache:clear-query
sudo php app/console doctrine:cache:clear-result

I get this error message for --env=prod

sudo php app/console doctrine:cache:clear-metadata  --env=prod
sudo php app/console doctrine:cache:clear-query  --env=prod
sudo php app/console doctrine:cache:clear-result --env=prod

 [LogicException]
  Cannot clear APC Cache from Console, its share in the Web server memory and not accessible from the CLI.

The only way I can get it to refresh Doctrine cache is to restart my apache server which can sometimes be an issue.

My cache settings for Doctine in my Symfony project:

doctrine:
    orm:
        metadata_cache_driver: apc
        result_cache_driver: apc
        query_cache_driver: apc
        second_level_cache:
            enabled: true
            log_enabled: false
            region_cache_driver: apc

How can I clear APC cache in this case without restarting Apache each time I release new schema update to production. This is even worse if you have many servers behind a load balancer.

Answer

Thomas Decaux picture Thomas Decaux · Nov 8, 2017

You must understand that Php running under Apache (or Nginx) is different than the Php running via the command line, they are 2 Linux process that cant communicate.

So, even if you can clear the cache via CLI, this will not affect the php under Apache.

The easiest way it to call apcu_clear_cache inside a Symfony controller, or, you can use the Apache Php socket via the CLI.

I recommend to use a tool like http://gordalina.github.io/cachetool/, which do that perfectly.

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