Message Queue consumer issue : context is not reset between messages

[Nuranto]

Preconditions and environment

• Magento version 2.4.6-p2

Steps to reproduce

1. Create a command test:publish_message that publish a message on a queue
2. Create a consumer that loads and display a product stock qty (via stock registry), and logs it. (initial qty = 100)
3. Launch the consumer
4. Run the test:publish_message
5. Edit the qty of the product on backend (qty : 200)
6. Run the test:publish_message
7. Check consumer's logs

Expected result

Logs should display :

100
200

Actual result

Logs display :

100
100

Additional information

This is because both messages are running in the same environement, without any reset of any kind.

With a high value of --max-messages or with consumers-wait-for-messages a consumer can run for days before restarting. This can have very bad consequences for some consumers.

I guess the easiest and safest solution is to run the message execution in a new process. But maybe it could also do the trick to - somehow - reset ObjectManager between each messages (But I'm afraid about memory consumption with that).

Workaround :

(with --consumers-wait-for-messages=1)

while true; do bin/magento queue:consumers:start --max-messages=1 -vvv consumer.name; done

This is a lot slower :/ but it solves the issue while waiting for a fix.

Release note

No response

Triage and priority

• Severity: S0 - Affects critical data or functionality and leaves users without workaround.
• Severity: S1 - Affects critical data or functionality and forces users to employ a workaround.
• Severity: S2 - Affects non-critical data or functionality and forces users to employ a workaround.
• Severity: S3 - Affects non-critical data or functionality and does not force users to employ a workaround.
• Severity: S4 - Affects aesthetics, professional look and feel, “quality” or “usability”.

[m2-assistant]

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[m2-assistant]

Hi @engcom-Hotel. Thank you for working on this issue.
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[engcom-Hotel]

Hello @Nuranto,

Thanks for the report and collaboration!

We have tried to reproduce the issue in Magento 2.4-develop branch and the issue is reproducible for us. We have used the below codebase to get to quantity of the product in consumer:

            $productSku = 'SimpleProduct1';
            $product = $this->productRepository->get($productSku);
            $stockItem = $this->stockRegistry->getStockItem($product->getId());
            $quantity = $stockItem->getQty();
            $message = $quantity . PHP_EOL;
            file_put_contents('CUSTOM_PATH/log.txt', $message, FILE_APPEND);

It is always returning the initial stock value even after reindexing and cache clear:

bin/magento indexer:reindex && bin/magento c:f

Hence confirming the issue.

Thanks