MAGETWO-64479: [Indexer optimizations] Indexation process in non-locking way for stock indexer

Author: Stanislav Idolov

app/code/Magento/CatalogInventory/Model/ResourceModel/Indexer/Stock/DefaultStock.php

@@ -404,9 +404,6 @@ private function getQueryProcessorComposite()
 
     /**
      * @inheritdoc
-     * Returns main table name based on the suffix stored in the 'indexer_state' table
-     *
-     * @return string
      */
     public function getMainTable()
     {

app/code/Magento/CatalogInventory/Model/ResourceModel/Indexer/Stock/IndexTableRowSizeEstimator.php

@@ -88,7 +88,12 @@
     </type>
     <virtualType name="Magento\CatalogInventory\Model\Indexer\Stock\BatchSizeManagement" type="Magento\Framework\Indexer\BatchSizeManagement">
         <arguments>
-            <argument name="rowSizeEstimator" xsi:type="object" shared="false">Magento\CatalogInventory\Model\ResourceModel\Indexer\Stock\IndexTableRowSizeEstimator</argument>
+            <argument name="rowSizeEstimator" xsi:type="object">Magento\CatalogInventory\Model\ResourceModel\Indexer\Stock\IndexTableRowSizeEstimator</argument>
+        </arguments>
+    </virtualType>
+    <virtualType name="Magento\CatalogInventory\Model\ResourceModel\Indexer\Stock\IndexTableRowSizeEstimator" type="Magento\Framework\Indexer\IndexTableRowSizeEstimator">
+        <arguments>
+            <argument name="rowMemorySize" xsi:type="number">100</argument>
         </arguments>
     </virtualType>
     <type name="Magento\CatalogInventory\Model\Indexer\Stock\Action\Full">

app/code/Magento/CatalogInventory/etc/di.xml

@@ -0,0 +1,34 @@
+<?php
+/**
+ * Copyright © 2013-2017 Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+
+namespace Magento\Framework\Indexer;
+
+/**
+ * Generic implementation for row size estimation.
+ */
+class IndexTableRowSizeEstimator implements IndexTableRowSizeEstimatorInterface
+{
+    /**
+     * @var int
+     */
+    private $rowMemorySize;
+
+    /**
+     * @param int $rowMemorySize
+     */
+    public function __construct($rowMemorySize)
+    {
+        $this->rowMemorySize = $rowMemorySize;
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function estimateRowSize()
+    {
+        return $this->rowMemorySize;
+    }
+}

lib/internal/Magento/Framework/Indexer/IndexTableRowSizeEstimator.php

@@ -0,0 +1,20 @@
+<?php
+/**
+ * Copyright © 2013-2017 Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+
+namespace Magento\Framework\Indexer\Test\Unit;
+
+class IndexTableRowSizeEstimatorTest extends \PHPUnit_Framework_TestCase
+{
+    /**
+     * Test for estimateRowSize method
+     */
+    public function testEstimateRowSize()
+    {
+        $rowMemorySize = 100;
+        $model = new \Magento\Framework\Indexer\IndexTableRowSizeEstimator($rowMemorySize);
+        $this->assertEquals($model->estimateRowSize(), $rowMemorySize);
+    }
+}