Distributed System

You might say

Orders, inventory, and payment run in different services. When a service or network fails, show exactly how far the order got.

A distributed system uses multiple computing nodes that coordinate over a network to achieve a system goal.During checkout, order, inventory, and payment services may run separately and exchange requests and results over a network. An inventory timeout does not mean every service stopped, so the system must handle partial failure. Multiple threads in one process share process resources and are not automatically a distributed system; the important boundary is network communication and independent failure.

Know first

Backend API

How one checkout crosses nodes and encounters partial failure

Orders and inventory across nodesCreate order

traffic / network

order-apiwrites order_42

networkcalls inventory

inventory-apiready to decrement

EvidenceNodes exchange information over the network

One user action spans independent runtime nodes.

Why a distributed system is harder to judge

The network splits one action into independent outcomes: After the order service sends an inventory request, inventory may have processed it, not received it, or processed it while the response was lost. Do not treat order-service success as proof that checkout completed; preserve the cross-service request identity and each result.

Return feedback to the same business operation: After an inventory timeout, use the request ID to determine what happened on both sides, then choose waiting, retrying, compensating, or informing the user. Verify a normal request and an unreachable-service request after the fix; these mechanisms improve judgment and recovery but do not remove network failure.

Online meeting transcription is also distributed: The recording service may have saved the audio while the transcription service returned nothing after a network timeout. Record the saved-audio and transcription states under the same meeting ID so the system can retry transcription instead of asking the user to record again.

You can say this to an AI Agent

Inspect the order and inventory services in the checkout flow. Keep one request ID across the call, and record sent, received, success, failure, and timeout results separately. Simulate an unreachable inventory service and state the order status, retry behavior, and how duplicate stock deduction is prevented. Verify one normal order and one inventory-timeout case with observable results from each service.

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The order service created an order, but the inventory service timed out over the network. Which judgment fits a distributed system?

A. Because the order service returned success, assume inventory was definitely deductedB. Inspect only the order service's thread count without checking the inter-service request and responseC. Use the request ID to inspect both services and separate completed, timed-out, and retryable steps