Running 'bin/magento catalog:images:resize' doesn't check if an image was already resized before, therefore it is superslow as it always resizes all images

[hostep]

I'm pretty sure in Magento 2.1 (and maybe 2.2) when you ran bin/magento catalog:images:resize, it only resized images which weren't already resized before.

This no longer seems to be the case in Magento 2.3.
I think this behavior got introduced by 4988790 (not verified yet)

Preconditions (*)

1. Magento 2.3.3
2. PHP 7.2.26

Steps to reproduce (*)

1. Have a shop with a product with an image
2. Run bin/magento catalog:images:resize
3. Look at the timestamp of the resized images in pub/media/catalog/product/cache/
4. Wait a while
5. Run bin/magento catalog:images:resize again
6. Notice that the modified timestamp of images in pub/media/catalog/product/cache/ has been altered, which means the images got resized again even if they already exist.

Expected result (*)

1. Executing bin/magento catalog:images:resize should not re-save an already resized image

Actual result (*)

1. Executing bin/magento catalog:images:resize re-saves already resized images

Temp solution

This seems to resolve the issue after some very initial testing:

diff --git a/app/code/Magento/MediaStorage/Service/ImageResize.php b/app/code/Magento/MediaStorage/Service/ImageResize.php
index 6da48ee69ed..ccfce994752 100644
--- a/app/code/Magento/MediaStorage/Service/ImageResize.php
+++ b/app/code/Magento/MediaStorage/Service/ImageResize.php
@@ -287,13 +287,18 @@ class ImageResize
     private function resize(array $viewImage, string $originalImagePath, string $originalImageName)
     {
         $imageParams = $this->paramsBuilder->build($viewImage);
-        $image = $this->makeImage($originalImagePath, $imageParams);
         $imageAsset = $this->assertImageFactory->create(
             [
                 'miscParams' => $imageParams,
                 'filePath' => $originalImageName,
             ]
         );
+        if ($this->mediaDirectory->isFile($imageAsset->getPath())) {
+            // image was already resized, let's quit!
+            return;
+        }
+
+        $image = $this->makeImage($originalImagePath, $imageParams);

         if (isset($imageParams['watermark_file'])) {
             if ($imageParams['watermark_height'] !== null) {

Postponing the initialization of the $image variable also has a very big impact on performance.

[m2-assistant]

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[m2-assistant]

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[magento-engcom-team]

✅ Confirmed by @shikhamis11
Thank you for verifying the issue. Based on the provided information internal tickets MC-31322 were created

Issue Available: @shikhamis11, You will be automatically unassigned. Contributors/Maintainers can claim this issue to continue. To reclaim and continue work, reassign the ticket to yourself.

[hostep]

Thanks @shikhamis11 for verifying!

I just tested some more on different clean Magento installations:

• 2.1.18: images which were resized before aren't being saved again => good
• 2.2.11: images which were resized before are being saved again => not good
• 2.3.4: images which were resized before are being saved again => not good