Idempotency Keys Are Harder Than They Look: The 5 Failure Modes Nobody Talks About

Every payment guide, every microservices tutorial, and every distributed-systems primer tells you the same thing: make your endpoints idempotent. Add…

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The Fundamental Tension Between Consistency and Availability Is Not a Technical Problem. It’s a Business Decision Most Engineers Are Making Alone

CAP theorem gets taught as a distributed systems concept. What’s completely missing is the organisational dimension: engineers are making these…

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Durable Execution: What Temporal and Conductor Are Solving That Queues Can’t

Message queues have served us well for two decades. But as distributed systems grow more complex — and as AI…

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The FLP Impossibility Result, 40 Years Later: Why It Still Defines Every Consensus Protocol You Use

In 1985, Fischer, Lynch, and Paterson proved that no deterministic algorithm can guarantee consensus in a fully asynchronous system with…

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Messaging with HiveMQ MQTT Client

The HiveMQ MQTT Client is a Java library that enables applications to communicate using the MQTT (Message Queuing Telemetry Transport)…

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Consistent Hashing: The Algorithm That Makes Distributed Caches and Databases Actually Scale

Theory, variants, and where it breaks — from the 1997 Karger et al. paper to virtual nodes in DynamoDB, Cassandra,…

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CRDTs: The Data Structure That Makes Distributed Consistency Optional and What It Costs

Conflict-free Replicated Data Types let replicas diverge freely and still guarantee eventual convergence. Here is the math behind why that…

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Temporal Coupling:The Hidden Dependency That Breaks Systems

Race conditions, event ordering failures, and the “works on my machine” mystery all share the same root cause — a…

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Getting Started with Distributed Job Scheduling Using ElasticJob

ElasticJob is a distributed job scheduling framework for Java within the Apache ShardingSphere ecosystem. It uses Apache ZooKeeper for distributed…

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