MAGETWO-55299: [Customer] Fast Save of Product Variations

     - MAGETWO-55787: Fast saving of product with high number of variations generated

Author: kandy

app/code/Magento/Catalog/Model/Product/Gallery/CreateHandler.php

@@ -58,7 +58,9 @@ class CreateHandler implements ExtensionInterface
      */
     protected $fileStorageDb;
 
-    /** @var  array */
+    /**
+     * @var array
+     */
     private $mediaAttributeCodes;
 
     /**

app/code/Magento/Catalog/Model/ResourceModel/Product/Link.php

@@ -97,10 +97,10 @@ public function getProductLinkId($parentId, $linkedProductId, $typeId)
     }
 
     /**
-     * Is product has links
+     * Check if product has links.
      *
-     * @param int $parentId
-     * @return int
+     * @param int $parentId ID of product
+     * @return bool
      */
     public function hasProductLinks($parentId)
     {

app/code/Magento/CatalogInventory/Model/Stock/StockItemRepository.php

@@ -134,6 +134,7 @@ public function __construct(
     }
 
     /**
+     * @deprecated
      * @return  \Magento\Catalog\Model\ResourceModel\Product\CollectionFactory
      */
     private function getProductCollectionFactory()

app/code/Magento/Eav/Model/ResourceModel/AttributeLoader.php

@@ -11,7 +11,9 @@
 use Magento\Framework\EntityManager\MetadataPool;
 
 /**
- * Class load and cache attributes from some attribute set
+ * Сlass responsible for loading and caching of attributes related to the given attribute set.
+ *
+ * Can be used to improve performance of services that mostly read attribute data.
  */
 class AttributeLoader
 {