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Abhijit Gadhave's blogs
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Why Cache Invalidation is Hard (And Why It Breaks Real Systems)
Jan 2 · 4 min read · “There are only two hard things in Computer Science: cache invalidation and naming things. — Phil Karlton” Caching is supposed to make systems faster.But most production bugs I’ve seen around performance had one thing in common — stale cache. The sys...
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Temporary Fixes That Lived Forever
Jan 1 · 2 min read · It started as a quick fix. A production issue.A tight deadline close to release.A message from Manager: “Can we hot-fix this today?” So I did what any responsible engineer would do. // TODO: Temporary fix, will clean up later I told myself: “This i...
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Life Before WebSockets
Dec 29, 2025 · 3 min read · Before WebSockets, the web didn’t talk — it waited. Imagine opening a chat app and repeatedly tapping Refresh just to see if someone replied.That’s not a bug. That was the design. If a server had new data, it couldn’t notify the client.The client had...
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Everything about cache in Distributed Systems
Dec 25, 2025 · 3 min read · Have you ever closely observed a librarian or a bookstore owner? When you ask for a book, they don’t immediately run to the warehouse. First, they check nearby — on their desk or the closest shelf. If the book is there, they hand it over instantly.If...
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