عرض عملي: أحداث الطلبات من البداية إلى النهاية

خطوة بخطوة

1. Start Kafka (KRaft) with Docker Compose; create orders with 3 partitions.
2. orders publishes OrderPlaced keyed by order ID with acks=all and idempotence on.
3. Consume in groups inventory and payments; show each gets every record.
4. Check ordering: send three events for one order and see the same partition and order.
5. Planned mistake: publish with a null key and show events of one order in different partitions and out of order. Fix with the order ID key.
6. Throw on a bad payload and show it arriving in orders.DLT.