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Fix query which creates significant deadlock potential. #6810

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Fix query which creates significant deadlock potential. #6810

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17 changes: 15 additions & 2 deletions app/code/Magento/CatalogInventory/Model/ResourceModel/Stock.php
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Original file line number Diff line number Diff line change
Expand Up @@ -127,11 +127,24 @@ public function lockProductsStock($productIds, $websiteId)
$itemTable = $this->getTable('cataloginventory_stock_item');
$productTable = $this->getTable('catalog_product_entity');
$select = $this->getConnection()->select()->from(['si' => $itemTable])
->join(['p' => $productTable], 'p.entity_id=si.product_id', ['type_id'])
->where('website_id=?', $websiteId)
->where('product_id IN(?)', $productIds)
->forUpdate(true);
return $this->getConnection()->fetchAll($select);
$rows = $this->getConnection()->fetchAll($select);

// Add type_id to result using separate select without FOR UPDATE instead
// of a join which causes only an S lock on catalog_product_entity rather
// than an X lock. An X lock on a table causes an S lock on all foreign keys
// so using a separate query here significantly reduces the number of
// unnecessarily locked rows in other tables, thereby avoiding deadlocks.
$select = $this->getConnection()->select()
->from($productTable, ['entity_id', 'type_id'])
->where('entity_id IN(?)', $productIds);
$typeIds = $this->getConnection()->fetchPairs($select);
foreach ($rows as &$row) {
$row['type_id'] = $typeIds[$row['product_id']];
}
return $rows;
}

/**
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