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 4 · 10 min read · Source: Reasons Java services get slower after a few hours: How to find thread pool saturation? You boot a service at 03:00 and it behaves beautifully: sub-second responses, healthy throughput. By noon, requests start lagging. After an outage ticke...
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May 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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Apr 24 · 13 min read · Source: Methods to Handle Time Drift Issues in Distributed Systems Many production incidents start with a moment of cognitive dissonance: logs from service A show an event happening "after" an event in service B, but tracing reveals the opposite. D...
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Apr 21 · 10 min read · Source: Methods to Prevent Duplicate Cron Execution Across Multiple Spring Boot Instances Modern cloud deployments scale application pods horizontally. A cron defined with Spring's @Scheduled suddenly runs N times — once per pod — unless you design...
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Apr 18 · 12 min read · Source: Methods to Handle Zombie Requests After the User Already Closed the Browser 1. An opening scenario (why the problem matters) Browsers close all the time — users switch tabs, hit the X, or their laptop goes to sleep. For many web applic...
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Apr 16 · 10 min read · Source: Reasons Thread Pool Misconfiguration Creates Fake Throughput in Java Backends 1. A quiet alarm: why you shouldn't trust requests/sec alone In a production incident I investigated, dashboards showed impressive requests/sec during a sudd...
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Apr 8 · 11 min read · Source: Reasons Circuit Breakers Fail in Real Systems When Timeouts, Retries, and Bulkheads Fight Each Other 1. Why your "smart" circuit breaker still blows up your system Production systems rarely fail in isolation. Instead they fail as emerg...
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Apr 5 · 11 min read · Source: Reasons Your Unique Constraint Is Not a Complete Concurrency Strategy You shipped a system where a unique index guards a business invariant. For a while everything looked fine: a unique constraint rejected duplicates, your logs showed an oc...
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