Duplicate orders with same Quote Id at same time with few time difference.

[amitvishvakarma]

Preconditions

1. Ability to process requests at same time. (in our case, we had use 2 different Client's system.)

Steps to reproduce

1. Login as a User
2. Add items to cart and proceed through checkout.
3. Select Any payment method. Not click on place order button
4. Now login to the same account in another system.
5. And proceed to checkout with the same items. Not click on place order button.
6. Now you have to click on place order at the same time with both the systems.
   Observe order confirmation screen of both systems. (usually first time you will get an error about constraint violations. Try to repeat steps 1-6 again. Issue reproduces 100% from the second attempt)

Depending on your infrastructure, this bug may be challenging to reproduce. It requires all of the "Place order" button clicks to be processed concurrently by Magento. You will not see the bug if Magento is processing requests sequentially (as the second request will reference a cart ID that no longer exists).

Expected result
A single order has been placed.
Alternatively, if multiple requests are unavoidable: Only the first request to be processed.

Actual result
Two different orders have been placed with very few seconds as time difference with same quote Id.

[magento-engcom-team]

@amitcedcoss, thank you for your report.
We've acknowledged the issue and added to our backlog.

[sunilit42]

I am working on this at #dmcdindia

[sunilit42]

It happens when you click same time on the button.
@magento-engcom-team There is two way we can do

1. use flock, for that we need to create one lock file quote wise when you click on that button
2. Either create one table and make an entry while click on submit and remove when order placement or fail order.

Let me know which way you want to process.

[timbaker1991]

Just to further this, we have the issue and it appears to affect PayPal orders mainly- though this may be coincidence (using the baked in Braintree support this is). Is there anything we could use as a hot fix do you know?

[amitvishvakarma]

@magento-engcom-team any update regarding our issue?

[buituanbg]

@magento-engcom-team I got the same issue too. The quote is same ID but it created 5 orders today. So I appreciate any updates for this.

[tzy1992]

@magento-engcom-team Any update on this issue? The issue occur randomly and it created multiple order on my site mainly from using Cash on Delivery payment method.