Niu Liu
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Niu Liu

A slightly rustic name 🤠 A tech veteran navigating the internet wave Hardcore tech: fixing all bugs and tough challenges

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Recent Articles

Latest from Niu Liu

25 recent articles
Niu Liu
Niu Liu
Jun 19, 2026 · Big Data

Building a Real‑Time Risk Control Engine with Flink 2.2.1, CEP, and Aviator

This article details a real‑time risk control system for e‑commerce and finance built on Apache Flink 2.2.1 and CEP, featuring a dynamic Aviator rule engine, three Kafka event streams, multi‑channel output to Redis, MySQL and Kafka, a Spring Boot‑React management UI, and step‑by‑step deployment instructions.

AviatorCEPFlink
0 likes · 11 min read
Building a Real‑Time Risk Control Engine with Flink 2.2.1, CEP, and Aviator
Niu Liu
Niu Liu
Jun 14, 2026 · Backend Development

Designing System Architecture for Small‑Medium Companies: When Do You Really Need 5,000 QPS?

The article outlines practical architecture strategies for small‑to‑medium enterprises, progressing from simple monolithic designs for a few thousand daily users to micro‑service and data‑sharding solutions for millions, emphasizing realistic scaling, avoiding premature complexity, and focusing on team capabilities and cost‑effective cloud services.

Operationsarchitecturecloud
0 likes · 7 min read
Designing System Architecture for Small‑Medium Companies: When Do You Really Need 5,000 QPS?
Niu Liu
Niu Liu
Jun 13, 2026 · Big Data

Real‑Time Dashboard Stack (RocketMQ + Flink + Elasticsearch + Kibana): Part 2 – Development Environment Setup

This article walks through setting up a real‑time dashboard stack using RocketMQ, Flink, Elasticsearch and Kibana, covering environment preparation, order data simulation, Flink job creation with source, transformation and Elasticsearch upsert sink, and visualisation considerations.

ElasticsearchFlinkKibana
0 likes · 14 min read
Real‑Time Dashboard Stack (RocketMQ + Flink + Elasticsearch + Kibana): Part 2 – Development Environment Setup