Mysql as gone away

[PyRowMan]

Hey guys,

I'm using the API-platform way of using frankenphp to create an API managing a MYSQL database,

My issue is that after a long time of inactivity (in dev environment for example) the mysql server closes the connection.

Since the connection seems to stay opened due to frankenphp. I get a "Mysql has gone away" after the wait_timeout as been reached I don't really now how it would be possible to renew the connection automatically. But I think it would be the way here ?

here is my doctrine configuration file if needed :

doctrine:
    dbal:
        url: '%env(resolve:DATABASE_URL)%'

        # IMPORTANT: You MUST configure your server version,
        # either here or in the DATABASE_URL env var (see .env file)
        #server_version: '15'

        profiling_collect_backtrace: '%kernel.debug%'
    orm:
        auto_generate_proxy_classes: true
        enable_lazy_ghost_objects: true
        report_fields_where_declared: true
        validate_xml_mapping: true
        naming_strategy: doctrine.orm.naming_strategy.underscore_number_aware
        auto_mapping: true
        mappings:
            App:
                is_bundle: false
                dir: '%kernel.project_dir%/src/Entity'
                prefix: 'App\Entity'
                alias: App

when@test:
    doctrine:
        dbal:
            # "TEST_TOKEN" is typically set by ParaTest
            dbname_suffix: '_test%env(default::TEST_TOKEN)%'

when@prod:
    doctrine:
        orm:
            auto_generate_proxy_classes: false
            proxy_dir: '%kernel.build_dir%/doctrine/orm/Proxies'
            query_cache_driver:
                type: pool
                pool: doctrine.system_cache_pool
            result_cache_driver:
                type: pool
                pool: doctrine.result_cache_pool

    framework:
        cache:
            pools:
                doctrine.result_cache_pool:
                    adapter: cache.app
                doctrine.system_cache_pool:
                    adapter: cache.system

I'm new to frankenphp so I don't understand all the basics of how it works, so if my issue is not where it should be I apologize in advance.

Here is the complete log in case :

{
"channel": "request",
"context":
    {
    "exception":
        {
        "class": "Doctrine\\DBAL\\Exception\\ConnectionLost",
        "code": 2006,
        "file": "/app/vendor/doctrine/dbal/src/Driver/API/MySQL/ExceptionConverter.php:104",
        "message": "An exception occurred while executing a query: SQLSTATE[HY000]: General error: 2006 MySQL server has gone away",
        "previous":
            {
            "class": "Doctrine\\DBAL\\Driver\\PDO\\Exception",
            "code": 2006,
            "file": "/app/vendor/doctrine/dbal/src/Driver/PDO/Exception.php:28",
            "message": "SQLSTATE[HY000]: General error: 2006 MySQL server has gone away",
            "previous":
                {
                "class": "PDOException",
                "code": 0,
                "file": "/app/vendor/doctrine/dbal/src/Driver/PDO/Statement.php:130",
                "message": "SQLSTATE[HY000]: General error: 2006 MySQL server has gone away"
                }
            }
        }
    },
"datetime": "2023-11-02T19:24:21.790899+01:00",
"extra":
    {
    },
"level": 500,
"level_name": "CRITICAL",
"message": "Uncaught PHP Exception Doctrine\\DBAL\\Exception\\ConnectionLost: \"An exception occurred while executing a query: SQLSTATE[HY000]: General error: 2006 MySQL server has gone away\" at /app/vendor/doctrine/dbal/src/Driver/API/MySQL/ExceptionConverter.php line 104"
}

[bpolaszek]

Related: #233

[dunglas]

Fixed by symfony/symfony#53214.

[AykutCevik]

Hello @dunglas, I still face the issue when using Symfony 7.1 and frankenphp:1-php8.3 docker image. After a while, I get the message that the "MySQL server went away". Should it be solved and I might be missing something?

[dunglas]

Be sure to use a version of DoctrineBundle that contains the fix. Last time I checked this was the dev version.

[AykutCevik]

Thank you, yes, it seems it will be released in 2.13 soon if I'm not mistaken: doctrine/DoctrineBundle@2.12.x...2.13.x

[riskersen]

Hi there,

we see the same issue, but with https://packagist.org/packages/doctrine/doctrine-bundle#2.13.x-dev
Normally, the application should either reconnect to the database or send kind of keepalives/ping to the database.
We don't see this behavior on vanilla-php-fpm container..

Any ideas? Perhaps @dunglas ? :)

Short update: as workaround, I increased wait_timeout on mysql side, but that it's quite dirty..

[juslintek]

Same issue here, but with doctrine-bundle 2.13 stable. :-) Seems like the problem got reintroduced again after the fix. :-)

[riskersen]

Our workaround is to disable worker mode of frankenphp.. we don't really rely on the speed, so stability and availability is more important to us

[dunglas]

Would you be able to provide a reproducer (a repository with Docker containing minimal code for instance)? I'll take a look.

[juslintek]

Hey @dunglas, try api-platform demo, but instead of postgres, make it with mysql: wait_timeout = 10. Also make sure doctrine-bundle is of v2.13. If that does not help to reproduce it, I will create with my own identical packages simple reproducer, but this will take time to prepare.

[juslintek]

Seems like issue is fixed with php 8.3.11 :-) I was using 8.3.7 it was related to mysql 8.0.36 or percona 8.0.36 pdo bug: php/php-src#13618