Tech-Reader.blog

  AWS Under Real Load: High-Concurrency LIST Operations and Metadata Saturation in Amazon S3 # aws # s3 # devops # cloud A production-grade diagnostic and prevention guide for latency spikes and throughput collapse caused by heavy concurrent LIST workloads in Amazon S3. Problem A system running at scale begins experiencing: Rising P95/P99 latency Slower batch job completion Increased API timeouts No obvious PUT/GET saturation No consistent 503 Slow Down responses Dashboards show object requests are stable. But workflows that depend on  LIST  operations degrade under load. The system appears healthy. But it feels slow. Clarifying the Issue High-concurrency  LIST  operations behave differently than  GET  or  PUT . LIST  requests: Traverse object metadata Scan prefix ranges Return paginated responses Consume internal index resources Under real load, heavy parallel  LIST  traffic can: Stress metadata partitions Increase tail latency Com...

  The Secret Life of Azure: The Identity That Didn’t Need a Password # azure # managedidentity # devops # cloudsecurity Eliminating the "Secret Zero" problem through Managed Identities. Governance & Guardrails The library was quiet, but Timothy was staring at the chalkboard with a look of intense concentration. He had successfully moved his database password into the Key Vault, but a new question was clearly bothering him. "Margaret," he said, turning around, "I understand that the password is safe in the Vault now. But to get into the Vault, doesn't my application still need a client secret or a certificate? It feels like I’ve just moved the problem. I’m still holding a key; I’ve just changed which door it opens." Margaret smiled, set down her book, and picked up the chalk. "You’ve discovered the 'Secret Zero' problem, Timothy. If you need a secret to get a secret, the chain never ends. But in Azure, we can break that chain. We give t...

  The Secret Life of Python: The Loop That Skipped # python # coding # programming # softwaredevelopment Fixing Python’s skipped‑item bug when removing list elements Timothy scratched his head, staring at the console output. "Margaret, I think Python is lazy." Margaret looked up from her tea. "Python is many things, Timothy, but lazy isn't usually one of them. What makes you say that?" "I have a list of tasks," Timothy explained. "I wrote a loop to remove all the 'done' tasks. But it keeps missing some! It cleans up  most  of them, but leaves a few behind. It's like it's doing a half-hearted job." He showed her the code: # Timothy's Cleanup Script tasks = [ " done " , " todo " , " done " , " done " , " todo " ] print ( f " Start: { tasks } " ) for item in tasks : if item == " done " : tasks . remove ( item ) print ( f ...

  The Secret Life of AWS: The Checklist (AWS Systems Manager & Runbooks) # aws # systemsmanager # runbooks # devops Why your brain is a single point of failure at 3 AM, and how a Runbook is your solution Part 36 of The Secret Life of AWS It was 3:14 AM. The vibration of the phone on the nightstand sounded like a jackhammer in the quiet room. Timothy fumbled for it, knocking a glass of water over in the process. SMS:   ALARM: "Checkout-Error-High" in US-East-1. He groaned, rubbed his eyes, and opened his laptop. The screen brightness blinded him. He squinted at the AWS Console, his brain feeling like it was full of cotton. "Okay," he whispered, typing with one finger. "Go to... logs. Which log group? Was it  Checkout-Prod  or  Prod-Checkout ?" He clicked the wrong one. Empty. He clicked back. He tried to write a Logs Insights query (from Episode 33) but forgot the syntax. Was it  filter @message  or  filter message ? Syntax Error. By the time h...