From 27ef0bee03b2456623c547eb634e661055e04fd9 Mon Sep 17 00:00:00 2001
From: Cyanat <65961341+Cyanat@users.noreply.github.com>
Date: Wed, 26 Jul 2023 11:44:29 +0200
Subject: [PATCH] Update redis_adapter.rst
Using RedisTagAwareAdapter, Redis maxmemory-policy has to be "noeviction" or "volatile-*"
---
components/cache/adapters/redis_adapter.rst | 28 ++++++++++++---------
1 file changed, 16 insertions(+), 12 deletions(-)
diff --git a/components/cache/adapters/redis_adapter.rst b/components/cache/adapters/redis_adapter.rst
index a7530e6d3f0..6f74b53dc63 100644
--- a/components/cache/adapters/redis_adapter.rst
+++ b/components/cache/adapters/redis_adapter.rst
@@ -220,19 +220,8 @@ Available Options
.. _redis-tag-aware-adapter:
-Working with Tags
------------------
-
-In order to use tag-based invalidation, you can wrap your adapter in :class:`Symfony\\Component\\Cache\\Adapter\\TagAwareAdapter`, but when Redis is used as backend, it's often more interesting to use the dedicated :class:`Symfony\\Component\\Cache\\Adapter\\RedisTagAwareAdapter`. Since tag invalidation logic is implemented in Redis itself, this adapter offers better performance when using tag-based invalidation::
-
- use Symfony\Component\Cache\Adapter\RedisAdapter;
- use Symfony\Component\Cache\Adapter\RedisTagAwareAdapter;
-
- $client = RedisAdapter::createConnection('redis://localhost');
- $cache = new RedisTagAwareAdapter($client);
-
Configuring Redis
-~~~~~~~~~~~~~~~~~
+-----------------
When using Redis as cache, you should configure the ``maxmemory`` and ``maxmemory-policy``
settings. By setting ``maxmemory``, you limit how much memory Redis is allowed to consume.
@@ -247,6 +236,21 @@ try to add data when no memory is available. An example setting could look as fo
maxmemory 100mb
maxmemory-policy allkeys-lru
+Working with Tags
+-----------------
+
+In order to use tag-based invalidation, you can wrap your adapter in :class:`Symfony\\Component\\Cache\\Adapter\\TagAwareAdapter`, but when Redis is used as backend, it's often more interesting to use the dedicated :class:`Symfony\\Component\\Cache\\Adapter\\RedisTagAwareAdapter`. Since tag invalidation logic is implemented in Redis itself, this adapter offers better performance when using tag-based invalidation::
+
+ use Symfony\Component\Cache\Adapter\RedisAdapter;
+ use Symfony\Component\Cache\Adapter\RedisTagAwareAdapter;
+
+ $client = RedisAdapter::createConnection('redis://localhost');
+ $cache = new RedisTagAwareAdapter($client);
+
+.. note::
+
+ When using RedisTagAwareAdapter, in order to maintain relationships between tags and cache items, you have to use either ``noeviction`` or ``volatile-*`` in the Redis ``maxmemory-policy`` eviction policy.
+
Read more about this topic in the official `Redis LRU Cache Documentation`_.
.. _`Data Source Name (DSN)`: https://en.wikipedia.org/wiki/Data_source_name
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