Aphelo – A Redis-like store in C++ with Progressive Rehashing
By Pranit Garje | github.com/pranitgarje
Aphelo – A Redis-like store in C++ with Progressive Rehashing launched on April 1, 2026 with 5 votes, #1,846 of 21,248 launches that month and more than 75% of that year's launches.
What it does
Pranit Garje Apr 01, 2026 1 Share There’s a particular kind of failure that doesn’t announce itself. It doesn’t throw an exception or crash your server. It just makes your system feel slow — but only sometimes. Unpredictably. At the worst possible moment. That’s the failure I hit when building Aphelo , my from-scratch, Redis-like in-memory database written in C++. And the cause was hiding inside the most fundamental operation a hash table performs: resizing. When I first replaced std::map with a hash table, everything felt right. Point lookups dropped from O(log N) to O(1). Throughput numbers looked great on paper. But there’s a clause buried in that O(1) guarantee that most tutorials skim…from veniatyrannus993225.substack.com
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