cache_split

The module provides a cache backend for Drupal to split cache items of a single bin into separate backends.

Installation

1. Download cache_split module or add it via composer
2. Enable cache_split module (e.g. drush en cache_split)
3. Change the cache backend for your bin (e.g. render) in your settings.php

<?php
$settings['cache']['bins']['render'] = 'cache.backend.split';
?>

4. Add split configuration for your bin to the settings.php:

<?php
$settings['cache_split']['render'] = [
  //..
];

See Configuration below for details.

Configuration

The configuration for a cache bin has to be defined in the settings.php:

<?php
$settings['cache_split']['NAME_OF_CACHE_BIN'] = [
  //..
];

Matcher definition

Each bin can hold multiple matcher definitions, each may consists of:

• backend: Name of the cache backend service to use (e.g. cache.backend.database). If not given it defaults to the key of the definition.
• includes: Array of cid patterns this backend should be used for. If this is empty all cids are included (except those excluded by excludes).
• excludes: Array of cid patterns this backend should not be used for

Wildcard syntax

A cid pattern may use * to match any number of arbitrary characters.

Fallback cache backend

A fallback backend can be defined by simply omitting includes and excludes or leaving them empty.

Make sure the fallback backend is defined last, so the other definitions are considered.

In case no fallback backend is specified, cache.backend.database is set as default.

Example

<?php
$settings['cache_split'] = [
  // Splits render cache in multiple backends.
  'render' => [
    // Do not cache render results for paragraphs, as they are only rendered in
    // context of the host entity.
    [
      'backend' => 'cache.backend.null',
      'includes' => [
        'entity_view:paragraph:*'
      ],
      'excludes' => [],
    ],
    // Falls back to database backend.
    [
      'backend' => 'cache.backend.database',
    ],
  ],
];
?>