Symfony annotations directory very large in prod environment

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I have a Symfony 2.8 project in the prod environment, but it 's too slow to clean the cache each time after code update.

After i check the cache directory, i found that the annotation directory under app/cache/prod is very large and the code logic is very simple, there are only a few number of twig pages.

What happened in this project and how can i fixed it?

$ du -h --max-depth=1 app/cache/prod/
2.6M    app/cache/prod/doctrine
1.3M    app/cache/prod/twig
349M    app/cache/prod/annotations
353M    app/cache/prod/

$ ls -lh app/cache/prod/annotations
total 1.0M
drwxr-xr-x 14 www-data www-data 4.0K Aug 13 16:12 00
drwxr-xr-x 12 www-data www-data 4.0K Aug 13 16:12 01
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and my composer.json:

{
    "name": "symfony/framework-standard-edition",
    "license": "MIT",
    "type": "project",
    "description": "The \"Symfony Standard Edition\" distribution",
    "autoload": {
        "psr-4": { "": "src/" },
        "files": [
            "app/AppKernel.php",
            "src/AliyunSDK/aliyun-php-sdk-core/Config.php"
        ]
    },
    "require": {
        "php": ">=5.6.10",
        "symfony/symfony": "2.8.*",
        "doctrine/orm": "^2.4.8",
        "doctrine/doctrine-bundle": "~1.4",
        "symfony/swiftmailer-bundle": "~2.3",
        "symfony/monolog-bundle": "^3.3",
        "sensio/distribution-bundle": "~5.0",
        "sensio/framework-extra-bundle": "^3.0.2",
        "incenteev/composer-parameter-handler": "~2.0",
        "endroid/qrcode": "1.8.0",
        "aliyuncs/oss-sdk-php": "^2.3",
        "overtrue/wechat": "~3.1",
        "symfony/form": "~2.8"
    },
    "require-dev": {
        "sensio/generator-bundle": "~3.0",
        "symfony/phpunit-bridge": "~2.7"
    },
    "scripts": {
        "post-install-cmd": [
            "Incenteev\\ParameterHandler\\ScriptHandler::buildParameters",
            "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::buildBootstrap",
            "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::clearCache",
            "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::installAssets",
            "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::installRequirementsFile",
            "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::prepareDeploymentTarget"
        ],
        "post-update-cmd": [
            "Incenteev\\ParameterHandler\\ScriptHandler::buildParameters",
            "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::buildBootstrap",
            "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::clearCache",
            "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::installAssets",
            "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::installRequirementsFile",
            "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::prepareDeploymentTarget"
        ]
    },
    "config": {
        "bin-dir": "bin"
    },
    "extra": {
        "symfony-app-dir": "app",
        "symfony-web-dir": "web",
        "symfony-assets-install": "relative",
        "incenteev-parameters": {
            "file": "app/config/parameters.yml"
        },
        "branch-alias": {
            "dev-master": "2.8-dev"
        }
    }
}
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Symfony 2.x stores each parsed annotation into separate file so amount of files into annotations cache may be quite big. It can happen even if amount of annotations is relatively small in application itself because annotations inside vendor bundles may also be parsed if it is required by them.

File-based cache for annotations is default for Symfony configuration, but it is not the only option. As can be seen into Symfony framework configuration reference - you can setup use of any cache implementation that implements Doctrine cache as annotations cache. Use of any non-file storage (e.g. redis / memcache / etc) will eliminate these cache files in filesystem and will also brings additional performance gain for application itself.