CompositeProductRowSizeEstimator.php

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<?php
namespace Magento\Catalog\Model\ResourceModel\Product\Indexer\Price;

use Magento\Framework\Indexer\IndexTableRowSizeEstimatorInterface;
use Magento\Store\Api\WebsiteManagementInterface;
use Magento\Customer\Model\ResourceModel\Group\CollectionFactory;

class CompositeProductRowSizeEstimator implements IndexTableRowSizeEstimatorInterface
{
    const MEMORY_SIZE_FOR_ONE_ROW = 200;

    private $websiteManagement;

    private $collectionFactory;

    private $compositeProductRelationsCalculator;

    public function __construct(
        WebsiteManagementInterface $websiteManagement,
        CollectionFactory $collectionFactory,
        CompositeProductRelationsCalculator $compositeProductRelationsCalculator
    ) {
        $this->websiteManagement = $websiteManagement;
        $this->collectionFactory = $collectionFactory;
        $this->compositeProductRelationsCalculator = $compositeProductRelationsCalculator;
    }

    public function estimateRowSize()
    {
        $websitesCount = $this->websiteManagement->getCount();
        $customerGroupCount = $this->collectionFactory->create()->getSize();
        $maxRelatedProductCount = $this->compositeProductRelationsCalculator->getMaxRelationsCount();

        return ceil($maxRelatedProductCount * $websitesCount * $customerGroupCount * self::MEMORY_SIZE_FOR_ONE_ROW);
    }
}