MAGETWO-56052: MySQL triggers for Indexers not removed after upgrade

Author: rganin

app/code/Magento/Indexer/Setup/RecurringData.php

@@ -0,0 +1,57 @@
+<?php
+/**
+ * Copyright © 2016 Magento. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+
+namespace Magento\Indexer\Setup;
+
+use Magento\Framework\Setup\InstallDataInterface;
+use Magento\Framework\Setup\ModuleContextInterface;
+use Magento\Framework\Setup\ModuleDataSetupInterface;
+use Magento\Indexer\Model\IndexerFactory;
+use Magento\Framework\Indexer\ConfigInterface;
+
+/**
+ * Upgrade registered themes
+ */
+class RecurringData implements InstallDataInterface
+{
+    /**
+     * @var IndexerFactory
+     */
+    private $indexerFactory;
+
+    /**
+     * @var ConfigInterface
+     */
+    private $configInterface;
+
+    /**
+     * RecurringData constructor.
+     *
+     * @param IndexerFactory $indexerFactory
+     * @param ConfigInterface $configInterface
+     */
+    public function __construct(
+        IndexerFactory $indexerFactory,
+        ConfigInterface $configInterface
+    ) {
+
+        $this->indexerFactory = $indexerFactory;
+        $this->configInterface = $configInterface;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function install(ModuleDataSetupInterface $setup, ModuleContextInterface $context)
+    {
+        foreach (array_keys($this->configInterface->getIndexers()) as $indexerId) {
+            $indexer = $this->indexerFactory->create()->load($indexerId);
+            if ($indexer->isScheduled()) {
+                $indexer->getView()->unsubscribe()->subscribe();
+            }
+        }
+    }
+}

lib/internal/Magento/Framework/Mview/etc/mview.xsd

@@ -106,7 +106,7 @@
     <xs:simpleType name="subscriptionModelType">
         <xs:annotation>
             <xs:documentation>
-                Subscription model must be a valid PHP class or interface name.
+                DEPRECATED. Subscription model must be a valid PHP class or interface name.
             </xs:documentation>
         </xs:annotation>
         <xs:restriction base="xs:string">