ACPT-867: STRUCTURE LAYOUT cache generates for each product category and takes ~18Kb (GZIP) per ea.

Author: kandy

lib/internal/Magento/Framework/App/Cache/Type/Layout.php

@@ -10,6 +10,17 @@
  */
 class Layout extends \Magento\Framework\Cache\Frontend\Decorator\TagScope
 {
+    /**
+     * Prefix for hash kay and hash data
+     */
+    private const HASH_PREFIX = 'l:';
+
+    /**
+     * Hash type
+     */
+    private const HASH_TYPE = 'xxh3';
+
+    private const DATA_LIFETIME = 86_400_000; // "1 day" miliseconds
     /**
      * Cache type code unique among all cache types
      */
@@ -27,4 +38,34 @@ public function __construct(FrontendPool $cacheFrontendPool)
     {
         parent::__construct($cacheFrontendPool->get(self::TYPE_IDENTIFIER), self::CACHE_TAG);
     }
+
+    /**
+     * @inheritDoc
+     */
+    public function save($data, $identifier, array $tags = [], $lifeTime = null)
+    {
+        $dataHash = hash(self::HASH_TYPE, $data);
+        $identifierForHash = self::HASH_PREFIX . $dataHash;
+        return parent::save($data, $identifierForHash, $tags, self::DATA_LIFETIME) // key is hash of data hash
+            &&  parent::save(self::HASH_PREFIX . $dataHash, $identifier, $tags, $lifeTime); // store hash of data
+
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function load($identifier)
+    {
+        $data = parent::load($identifier);
+        if ($data === false) {
+            return $data;
+        }
+
+        if (str_starts_with($data, self::HASH_PREFIX)) {
+            // so data stored in other place
+            return parent::load($data);
+        } else {
+            return $data;
+        }
+    }
 }

lib/internal/Magento/Framework/Cache/Backend/Redis.php

@@ -70,7 +70,7 @@ public function load($id, $doNotTestCacheValidity = false)
      * @param bool $specificLifetime
      * @return bool
      */
-    public function save($data, $id, $tags = [], $specificLifetime = false)
+    public function save($data, $id, $tags = [], $specificLifetime = 86_400_000)
     {
         // @todo add special handling of MAGE tag, save clenup
         try {