Grokking the System Design Interview, Volume II
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Flash Sale: Detailed Component Design

Step 6: Detailed Component Design and Data Management

In a flash sale, each buy request transitions through several states as it is processed by different services. Below is the lifecycle of a transaction from initiation to completion or termination:

1. Transaction States

  • WAITING: The transaction is in the Kafka waiting queue, waiting for inventory assignment. At this stage, the transaction is only in Kafka (i.e., not stored in DB).
  • PROCESSING: The transaction has been dequeued from Kafka, and the inventory is being checked

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