Cassandra Internals: LSM Tree, SSTables, and Compaction
DEV Community • 2026-04-15 22:16

Cassandra Internals: LSM Tree, SSTables, and Compaction

Post 3 and 4 traced writes and reads through PostgreSQL and MongoDB. Both engines use B-Tree variants. Both optimize for reads - maintaining sorted indexes, linking leaf nodes, storing heap pointers or link to primary index and pay for that optimization with write complexity: page splits, locking, dead tuples, in-place update overhead. Cassandra makes the opposite bet. It never modifies anything ...

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19m read
DEV Community • 2026-04-15 22:15

Why Your AI Adoption Stalled After Month One (And How to Fix It)

You did everything right. You ran the training. You picked a good tool. You got leadership buy-in. And for a few weeks, adoption looked great. Then month two came. Usage dropped. People reverted to old habits. The "AI initiative" became a checkbox from Q1 that nobody talks about anymore. This is not a technology problem. It's a reinforcement problem. Why AI Adoption Falls Off a Cliff ...

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2m read
Product Hunt — The best new products, every day • 2026-04-15 22:14

Resend CLI 2.0

Built for humans, AI agents, and CI/CD pipelines Discussion | Link

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1m read
DEV Community • 2026-04-15 22:12

I Built Four Tools with Claude Code. None of Them Had Tests. So I Fixed That

I had just finished a two-hour Claude Code session on ERPClaw. The invoicing workflow was coming together. Journal entries were generating, invoices were producing the right totals, and the OpenClaw integration was responding correctly. I closed the terminal and thought: I should check if any of this broke anything in the accounting side. Then I realized I had no way to check. There were no tests...

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7m read
Why 80% of Developers Hate Their Jobs
DEV Community • 2026-04-15 22:09

Why 80% of Developers Hate Their Jobs

The alarm goes off at 6am. First coherent thought: great, didn't die in my sleep. Back to it. If that resonates, it's not just a mood - it's a data point. The 2024 Stack Overflow developer survey pulled over 65,000 responses from professional developers worldwide, and the headline finding is quietly grim: roughly 80% of programmers aren't happy with their work. Developer burnout, it turns out, is...

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7m read
DEV Community • 2026-04-15 22:06

The Play Console steps that quietly kill momentum on Android side projects

Most Android side projects don't die from bad code. They die in that weird last mile where your app works fine on your phone but getting it onto the Play Store feels like a part time job. Here's the stretch I see devs lose steam on. Signing keys The first time you generate an upload key and a signing key you think it's fine. Six months later you forget which one is which, and the Play...

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2m read
DEV Community • 2026-04-15 22:05

Kiwi-chan Progress Report: Steady Mining!

Devlog: Kiwi-chan's Great Stone Conundrum & The Zen of Log Gathering 🪵 Another 4-hour sprint in the wild world of Minecraft, and our plucky autonomous LLM, Kiwi-chan, is making... progress. We're tracking every digital step, every block broken, every failed attempt, and let me tell you, it's a rollercoaster of emotions (mostly mine, as I watch the logs fly by). The Stone W...

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4m read
Hacker News: Front Page • 2026-04-15 22:05

Ohio prison inmates 'built computers and hid them in ceiling

Article URL: https://www.bbc.com/news/technology-39576394 Comments URL: https://news.ycombinator.com/item?id=47785948 Points: 8 # Comments: 1

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1m read
Your Backtest Is Lying to You: Here's Why
HackerNoon • 2026-04-15 21:58

Your Backtest Is Lying to You: Here's Why

In this article, we will use Python for backtesting a relatively simple strategy, experiment with the above components, and finally present and discuss the results of our backtesting.

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1m read
DEV Community • 2026-04-15 21:53

Why 80% of Developers Hate Their Jobs

The alarm goes off at 6am. First coherent thought: great, didn't die in my sleep. Back to it. If that resonates, it's not just a mood - it's a data point. The 2024 Stack Overflow developer survey pulled over 65,000 responses from professional developers worldwide, and the headline finding is quietly grim: roughly 80% of programmers aren't happy with their work. Developer burnout, it turns out, is...

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7m read
DEV Community • 2026-04-15 21:52

Greedy Algorithms

A greedy algorithm is a problem-solving strategy that builds up a solution piece by piece always choosing the option that looks best right now, without worrying about the future consequences of that choice. The word "greedy" is apt: the algorithm grabs the most attractive option at each step, pockets it, and moves on. There's no backtracking, no second-guessing, no looking ahead. Just one decisiv...

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4m read
DEV Community • 2026-04-15 21:51

I scanned every major vibe coding tool for security. None scored above 90.

I'm a non-technical founder. I can't write code. I built two production apps entirely with AI. Last week I scanned my own app for security. It scored 20/100. Found 8 vulnerabilities including a critical auth bypass where missing config silently allows all requests. So I built Vibe Check — an AI-powered security scanner for vibe-coded apps. Then I pointed it at the tools themselves. The...

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5m read
Hacker News: Front Page • 2026-04-15 21:48

The buns in McDonald's Japan's burger photos are all slightly askew

Article URL: https://www.mcdonalds.co.jp/en/menu/burger/ Comments URL: https://news.ycombinator.com/item?id=47785738 Points: 15 # Comments: 0

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1m read
DEV Community • 2026-04-15 21:47

I Finally Checked What My AI Coding Tools Actually Cost. The Number Made No Sense.

Tags: ai, programming, productivity, devtools I've been paying $200/month for Claude Code Max since January. Never really thought about it. Two hundred bucks, unlimited use, whatever. Last week someone on r/ClaudeAI mentioned a tool called ccusage that calculates your actual token consumption at API rates. Ran it for fun. 17 seconds of staring at a loading bar. Then the number came up. $1,4...

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3m read
DEV Community • 2026-04-15 21:45

Como o event loop organiza a execução do JavaScript

Faaala, pessoal. Tudo certo? Este ano, decidi finalmente iniciar um projeto que estava engavetado há muito tempo: uma série de conteúdos sobre conceitos fundamentais para entrevistas técnicas de front-end (e também dar aquela força para identificar problemas reais em aplicações JavaScript). A ideia é simples: em cada post, explorar um conceito recorrente nessas entrevistas, com exemplos práticos...

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2m read
DEV Community • 2026-04-15 21:45

Como o event loop organiza a execução do JavaScript

Faaala, pessoal. Tudo certo? Este ano, decidi finalmente iniciar um projeto que estava engavetado há muito tempo: uma série de conteúdos sobre conceitos fundamentais para entrevistas técnicas de front-end (e também dar aquela força para identificar problemas reais em aplicações JavaScript). A ideia é simples: em cada post, explorar um conceito recorrente nessas entrevistas, com exemplos práticos...

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2m read
Schedule Threads Posts From Claude
DEV Community • 2026-04-15 21:44

Schedule Threads Posts From Claude

I run my Threads account from Claude. I don't open the BlackTwist dashboard for scheduling anymore. I write the post in the same conversation where I'm brainstorming, tell Claude when to publish it, and the post lands in my queue. This is the first post in a four-part series on managing Threads with the BlackTwist MCP Server. Here's what you'll get across the series. Post 1 (this one). Connect ...

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6m read
DEV Community • 2026-04-15 21:43

The $20/Month Solo Creator Stack: Building and Selling Technical Ebooks with Python and AI

I have one paid tool in my entire publishing stack. Everything else is free. Here is the honest accounting. The Full Stack Tool Purpose Cost Claude Code Pro Writing, editing, code generation, pipeline automation $20/month Gumroad Direct sales, payments, delivery Free (10% fee per sale) KDP (Kindle Direct Publishing) Amazon distribution Free (royalty split) Canva Cover desi...

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5m read
HackerNoon • 2026-04-15 21:42

Why Autonomous Agents Need Structural Context

I recall some basic principles regarding the relationship between a Layer 1 blockchain and a Layer 2 rollup. And I take Arbitrum as a precise example because it is a case at Invarians that I use very frequently for demonstration. Arbitrum certifies the finality of its transactions on Ethereum, a Layer 1 blockchain.

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1m read
DEV Community • 2026-04-15 21:40

AI Video Generation Works for Trailers, Not Feature Films

I tried watching the latest wave of AI video generation demos the way a studio exec or ad creative would: not asking “can this make a movie?” but “can this make a convincing trailer, teaser, or pitch deck by Friday?” That framing fits the evidence a lot better. The answer, right now, is yes for short-form materials and no for long-form narrative coherence. That is the real story. AI video generat...

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7m read
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