Elastic Search 5 Indexing Performance Issue

[DarthFly]

Preconditions (*)

1. Magento 2.3 and Elastic Search v5 configured.
2. Ability to debug ProductDataMapper.php file - https://github.com/magento/magento2/blob/2.3-develop/app/code/Magento/Elasticsearch/Model/Adapter/BatchDataMapper/ProductDataMapper.php

Steps to reproduce (*)

1. Create a searchable product attribute with a lot of values. Most common - brands. We had around 300 values.
2. Install a lot of products that use values inside this attribute. In our case it was ~180k, but for the debug you may use sample data.
3. Run reindex bin/magento indexer:reindex catalogsearch_fulltext (or trigger it in a way to be able to debug)

Expected result (*)

1. Index is running fine and take sane amount of time.

Actual result (*)

1. (In our case and develop PC) with elastic 2.3 reindex takes ~40m to complete. With Elastic5 - it was complete in 8h

Issue comes from this method.

private function getValuesLabels(Attribute $attribute, array $attributeValues): array
    {
        $attributeLabels = [];
        foreach ($attribute->getOptions() as $option) {
            if (\in_array($option->getValue(), $attributeValues)) {
                $attributeLabels[] = $option->getLabel();
            }
        }
        return $attributeLabels;
    }

For each product magento run this code providing an array of attribute ids here. This is used for both multiple and single (select) attributes, so $attributeValues may look like [123, 456] (simplified, value looks a little differently), but for brands it mostly contain one value.
$attribute->getOptions() return an array with 300+ values, each is compared to the $attributeValues array to be able to retrieve a label value for this specific attribute.

Even if one search takes milliseconds (well, mostly hundreds of milliseconds) multiply this code by amount of products and you will see drop down of performance here by 5 hours.

There are 2 ways to improve this foreach fast - cache attribute values by id somewhere and validate if each value inside $attributeValues exists as key or cache values that are returned after function (will require joining array). Class is used for every product, so pre-cached value will be used correctly without recalculating it on each product.

[magento-engcom-team]

Hi @DarthFly. Thank you for your report.
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Please make sure that the issue is reproducible on the vanilla Magento instance following Steps to reproduce. To deploy vanilla Magento instance on our environment, please, add a comment to the issue:

@magento-engcom-team give me 2.3-develop instance - upcoming 2.3.x release

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@DarthFly do you confirm that you was able to reproduce the issue on vanilla Magento instance following steps to reproduce?

• yes
• no

[magento-engcom-team]

Hi @engcom-backlog-nazar. Thank you for working on this issue.
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Hi @DarthFly thank you for your report, which version of elastic you use ?

[DarthFly]

@engcom-backlog-nazar Elastic 5 latest and the one installed on cloud. It doesn't really matter as problem is inside magento code, not when data is transferred to and from Elastic.

@DarthFly in your case seems like not) but really which is version 5.2.x?
only 5.2.x is supported

[magento-engcom-team]

✅ Confirmed by @engcom-backlog-nazar
Thank you for verifying the issue. Based on the provided information internal tickets MAGETWO-98054, MAGETWO-98055 were created

Issue Available: @engcom-backlog-nazar, You will be automatically unassigned. Contributors/Maintainers can claim this issue to continue. To reclaim and continue work, reassign the ticket to yourself.