Grokking the System Design Interview, Volume II
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Code Judging System: Detailed Component Design

Step 6: Detailed Component Design

a. Submission Queue (Message Queue)

A critical component for decoupling is the queue that sits between the Submission service and the Code Execution workers. When a user submits code, the request is turned into a job message that is placed onto a queue (for example, RabbitMQ, Kafka, AWS SQS, etc.). The job message includes all information needed to run the code: submission ID, code, language, problem ID (to fetch test cases), and maybe the input test files or a reference to them.

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