3d ago · 12 min read · Source: Reasons TTL Alone Is a Weak Cache Strategy for Frequently Updated Business Data You know that feeling when a fast, simple idea looks like the obvious engineering short-cut—and then quietly turns into a production headache? TTL-based caching...
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6d ago · 12 min read · Source: Techniques: How to design versioned commands so retries stay safe under concurrent modification? 1. Opening: when retries hurt Start with a familiar failure: you design a retry loop to make an operation resilient. It retries on transie...
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May 7 · 5 min read · The Bug That Only Happens Sometimes User reports: "I updated my profile but it still shows the old name." You refresh: new name appears. You ask them to refresh: still old name. You debug together: it's back to new name. The user: "This is clearly br...
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May 6 · 13 min read · There's an impulse, when someone first learns about consistency models in distributed systems, to want to classify the taxonomy into neat drawers. Strong here. Eventual there. Linearizable above it. Read-your-writes below. Study the diagram, pass the...
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May 6 · 12 min read · Source: Techniques to Partition Data for Growth Without Breaking Query Simplicity You don't realize how often "just one query" matters until you've got ten million rows, a dozen replicas, and a product manager who needs a dashboard to load in under...
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May 3 · 20 min read · TLDR: Split brain happens when a network partition causes two nodes to simultaneously believe they are the leader — each accepting writes the other never sees. Prevent it with quorum consensus (at least ⌊N/2⌋+1 nodes must agree before leadership is g...
Join discussionMay 3 · 18 min read · TLDR: Physical clocks on distributed machines cannot be perfectly synchronized. NTP keeps them within tens to hundreds of milliseconds in normal conditions — but under load, across datacenters, or after a VM pause, the drift can reach seconds. When s...
Join discussionMay 3 · 23 min read · TLDR: Stale reads return superseded data from replicas that haven't yet applied the latest write. Cascading failures turn one overloaded node into a cluster-wide collapse through retry storms and redistributed load. Both are preventable — stale reads...
Join discussionMay 2 · 11 min read · Source: Ways to Invalidate Derived Caches Without Creating a Distributed Guessing Game You’ve likely seen it: a derived cache (an aggregate, a denormalized view, or a materialized snapshot) starts drifting from its authoritative sources. Teams reac...
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