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This article introduces the design of a standalone notification‑system microservice, covering its functional requirements, conceptual and logical data models, and key workflow diagrams to guide implementation in Java‑based internet projects.
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Baidu’s full‑volume push system leverages a public‑mailbox architecture that merges a single shared mailbox with users’ private mailboxes during retrieval, enabling low‑disturbance, high‑speed delivery to over 600 million monthly active users while reducing write costs, as demonstrated by three pandemic‑policy messages reaching more than 200 million users within three days.
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