Magento 2 duplicate orders – lack of idempotency in checkout
The shop was generating duplicate orders – a customer clicked “Order” once but two identical orders were created with double payment. The problem affected ~2% of orders, mainly on slow internet connections. Fix time: 6 hours.
- Published in Magento / Adobe Commerce
Magento 2 products not appearing in search – OpenSearch problem
Customers could not find products through the search engine even though products were visible in categories. Searching by SKU, name and description returned no results. The problem grew over 2 weeks after migrating to a new server. Fix time: 2 hours.
- Published in Magento / Adobe Commerce
Magento 2 Varnish cache not working – 0% hit rate and wrong VCL config
Varnish was installed and configured, but every request was hitting PHP – hit rate was 0%. The server was overloaded despite Varnish. The problem was in wrong VCL configuration and session cookies. Fix time: 4 hours.
- Published in Magento / Adobe Commerce
PHP Fibers – cooperative multitasking, async without extensions, ReactPHP
Fibers arrived in PHP 8.1 as a cooperative multitasking mechanism – the ability to suspend and resume a function at any point. These are not threads or processes – a Fiber runs in the same PHP thread but allows switching between tasks without blocking. I show how Fibers work, where they make sense, and how async libraries (ReactPHP, Amp) use them under the hood.
- Published in PHP