WARNING [cache] Failed to save key "xxx"

[peter-gribanov]

Symfony version(s) affected: 3.4.39

Description

There are quite a few warnings when executing console commands.

12:13:36 WARNING   [cache] Failed to save key "Symfony.Component.Form.Form" (Symfony\Component\Validator\Mapping\ClassMetadata) ["key" => "Symfony.Component.Form.Form","type" => "Symfony\Component\Validator\Mapping\ClassMetadata","exception" => null]
12:13:36 WARNING   [cache] Failed to save key "IteratorAggregate" (Symfony\Component\Validator\Mapping\ClassMetadata) ["key" => "IteratorAggregate","type" => "Symfony\Component\Validator\Mapping\ClassMetadata","exception" => null]
12:13:36 WARNING   [cache] Failed to save key "Traversable" (Symfony\Component\Validator\Mapping\ClassMetadata) ["key" => "Traversable","type" => "Symfony\Component\Validator\Mapping\ClassMetadata","exception" => null]
12:13:36 WARNING   [cache] Failed to save key "Symfony.Component.Form.FormInterface" (Symfony\Component\Validator\Mapping\ClassMetadata) ["key" => "Symfony.Component.Form.FormInterface","type" => "Symfony\Component\Validator\Mapping\ClassMetadata","exception" => null]
12:13:36 WARNING   [cache] Failed to save key "ArrayAccess" (Symfony\Component\Validator\Mapping\ClassMetadata) ["key" => "ArrayAccess","type" => "Symfony\Component\Validator\Mapping\ClassMetadata","exception" => null]
12:13:36 WARNING   [cache] Failed to save key "Countable" (Symfony\Component\Validator\Mapping\ClassMetadata) ["key" => "Countable","type" => "Symfony\Component\Validator\Mapping\ClassMetadata","exception" => null]
12:13:36 WARNING   [cache] Failed to save key "FOS.UserBundle.Model.User" (Symfony\Component\Validator\Mapping\ClassMetadata) ["key" => "FOS.UserBundle.Model.User","type" => "Symfony\Component\Validator\Mapping\ClassMetadata","exception" => null]
12:13:36 WARNING   [cache] Failed to save key "FOS.UserBundle.Model.UserInterface" (Symfony\Component\Validator\Mapping\ClassMetadata) ["key" => "FOS.UserBundle.Model.UserInterface","type" => "Symfony\Component\Validator\Mapping\ClassMetadata","exception" => null]
12:13:36 WARNING   [cache] Failed to save key "Symfony.Component.Security.Core.User.AdvancedUserInterface" (Symfony\Component\Validator\Mapping\ClassMetadata) ["key" => "Symfony.Component.Security.Core.User.AdvancedUserInterface","type" => "Symfony\Component\Validator\Mapping\ClassMetadata","exception" => null]
12:13:36 WARNING   [cache] Failed to save key "Symfony.Component.Security.Core.User.UserInterface" (Symfony\Component\Validator\Mapping\ClassMetadata) ["key" => "Symfony.Component.Security.Core.User.UserInterface","type" => "Symfony\Component\Validator\Mapping\ClassMetadata","exception" => null]
12:13:36 WARNING   [cache] Failed to save key "Serializable" (Symfony\Component\Validator\Mapping\ClassMetadata) ["key" => "Serializable","type" => "Symfony\Component\Validator\Mapping\ClassMetadata","exception" => null]
12:13:36 WARNING   [cache] Failed to save key "FOS.UserBundle.Model.GroupableInterface" (Symfony\Component\Validator\Mapping\ClassMetadata) ["key" => "FOS.UserBundle.Model.GroupableInterface","type" => "Symfony\Component\Validator\Mapping\ClassMetadata","exception" => null]
12:13:36 WARNING   [cache] Failed to save key "FOS.UserBundle.Model.Group" (Symfony\Component\Validator\Mapping\ClassMetadata) ["key" => "FOS.UserBundle.Model.Group","type" => "Symfony\Component\Validator\Mapping\ClassMetadata","exception" => null]
12:13:36 WARNING   [cache] Failed to save key "FOS.UserBundle.Model.GroupInterface" (Symfony\Component\Validator\Mapping\ClassMetadata) ["key" => "FOS.UserBundle.Model.GroupInterface","type" => "Symfony\Component\Validator\Mapping\ClassMetadata","exception" => null]

10:28:02 WARNING   [cache] Failed to save key "Contest.Vote.Domain.Command.UpdateTotalVotes" (Symfony\Component\Validator\Mapping\ClassMetadata) ["key" => "Contest.Vote.Domain.Command.UpdateTotalVotes","type" => "Symfony\Component\Validator\Mapping\ClassMetadata","exception" => null]
10:28:02 WARNING   [cache] Failed to save key "Core.CQRS.Command.CommandInterface" (Symfony\Component\Validator\Mapping\ClassMetadata) ["key" => "Core.CQRS.Command.CommandInterface","type" => "Symfony\Component\Validator\Mapping\ClassMetadata","exception" => null]

How to reproduce

This problem occurs on the prod server. On the local machine, this problem does not reproduce.

I can't reproduce the error because i do not understand the reason and context of its occurrence.

How is the \Traversable class and Symfony Validator component related and why it should be cached?

[xabbuh]

Related to #34962?

[peter-gribanov]

Maybe. I'm not sure. I do not control caching of \Traversable class and Symfony Validator component.

My cache config:

framework:
    annotations:
        cache: 'app.cache.annotations'
    cache:
        app: 'app.cache.app'
        system: 'app.cache.system'

services:
    app.cache.annotations:
        parent: 'doctrine_cache.abstract.apcu'
        public: false
        calls:
            - [ setNamespace, [ '%app.hash%|%secret%|sac:' ] ]

    app.cache.app:
        parent: 'cache.adapter.apcu'
        arguments: [ '%app.hash%|%secret%|sac:', 0, ~ ]
        public: false

    app.cache.system:
        parent: 'cache.adapter.apcu'
        arguments: [ '%app.hash%|%secret%|ssc:', 0, ~ ]
        public: false

[nicolas-grekas]

Yes, that's the same as #34962
You redefine the cache.system service, which is used by system caches, among them is the validator cache. Closing as duplicate then, please follow the other issue.

[antoine1003]

I fixed this by adding apc.enable_cli = 1 in php.ini file 😄