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Networking & Systems

24 deep dives

Unix intermediate

10 Minutes to Clarity: Uber’s Open-Source Backbone and the Quest for Per-Tenant Error Counts

In Uber's world, metrics exploded across thousands of microservices, and Prometheus alone couldn’t scale to keep up [1]....

unix
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Linux advanced

The Slab Whisperer: How to Tame Tail Latency in a High-Concurrency Linux World

Picture this: a Linux host under heavy, multi-tenant load starts coughing up tens-of-millisecond tail latencies during b...

linux
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Linux intermediate

What Netflix Learned About Tail Latency on NUMA: A Linux Toolkit-Driven Debugging Journey

It was a night when Netflix encountered tail latency bursts on a quad-socket NUMA machine as containerized workloads sur...

linux
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Linux advanced

The Memory Trap: How to Diagnose Tail Latency in Containerized Linux Clusters

In Elastic Cloud, production memory pressure on Kubernetes nodes surfaced during bursts, driven by kernel memory account...

linux
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Unix intermediate

The Night Logs Escaped: Netflix’s Wake-Up Call and a Robust Way to Reclaim Open File Descriptors

It was a night when a busy Unix host started screaming in silence. Netflix’s Dynomite project faced a production race wh...

unix
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Unix beginner

When Petabytes Go Silent: A Netflix-Scale Journey Through Logs

Picture this: Netflix sits on a mountain of logs—petabytes pouring in from thousands of microservices—yet near real-time...

unix
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Linux intermediate

A NUMA Tale: Unraveling Tail Latency with Linux Memory Reclaim

In 2013, LinkedIn faced intermittent tail latency spikes on NUMA servers during peak ingestion for an online-graph workl...

linux
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Linux advanced

The Burst That Revealed the Hidden Cache War

It was a 50-server Microsoft production cluster—the OneRF lineage—that first whispered the truth: tail latency can spike...

linux
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Unix beginner

Two-Phase Compression: How Uber Tamed a Log Mountain Without Breaking the Bank

Uber’s Spark-driven data platform faced log volumes so monstrous that retention costs threatened to swallow the budget. ...

unix
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Linux beginner

The Kernel, the Firewall, and the Command Line: A DevOps Journey Through Linux Mastery

It started in Automattic's WordPress VIP infrastructure on Kubernetes: a routine firewall-rule reload slowed to a crawl,...

linux shell
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Unix beginner

The 24-Hour Log Hunt: A One-Liner That Surfaces Busy Users (And Why Knight Capital's Lesson Still Matters)

In August 2012, Knight Capital Group deployed a new trading system. In about 45 minutes, a faulty deployment flooded the...

unix
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Linux intermediate

Linux on Fire: A Netflix‑style 60‑Second Triage That Cracks Tail Latency

Picture this: a Linux node in a high‑throughput data ingestion pipeline suddenly shows tail latency spikes after 1s duri...

linux
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Networking intermediate

Sticky Sessions at Scale: Booking.com's HAProxy Playbook and the Locality Dilemma

Booking.com scaled its global application delivery network using an internal LBaaS built around HAProxy to manage billio...

lb traffic nginx
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Linux intermediate

Latency Unmasked: A Triaged Journey Through Linux Kernel Hurdles

It started with a single, stubborn question: why would a Linux-powered Redis-backed web app experience 30-second tail la...

linux
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Linux advanced

The Midnight Mystery: Why Your Linux Server Lies About Memory

It was 3am when the pager went off. Production services were crashing, but `free -m` showed 8GB available RAM. I stared ...

linux
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Operating Systems advanced

The $2 Million Memory Mistake That Broke NVIDIA's GPU Demo

Picture this: It's GTC Europe 2018, and NVIDIA's team is preparing to showcase their revolutionary RAPIDS platform. The ...

operating-systems
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Unix advanced

The Night Tasks Hung: A Production-Trior story of taming I/O waits in Linux

Picture this: a production cluster rigged with cloud-scale services suddenly emits hung-task warnings, and every attempt...

unix
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Unix intermediate

The Silent Killer: When Your Linux Processes Vanish into Uninterruptible Sleep

Picture this: It's 2 AM and your monitoring dashboard is screaming. Dozens of unrelated processes are stuck in uninterru...

unix
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Linux intermediate

The Mysterious Case of the OOM Killer: How to Diagnose a Production Outage You Can’t Ignore

Seqera Labs faced a brutal wake-up call in mid-2022: Nextflow tasks on AWS EC2 containers began dying with OOM errors ev...

linux
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Operating Systems intermediate

The Vanishing CPU: A ClickHouse Case Study on Debugging with Kernel Memory Reclaim in the Clouds

Picture this: ClickHouse Cloud on GCP encounters random, unresponsive pods where CPU spikes to 100% and signals go unhea...

operating-systems
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Unix advanced

When D-Stated Chaos Strikes: A Red Hat War Story That Teaches You to Debug Like a Pro

It was 3am when a flood of D-state processes made a Red Hat Enterprise Linux 7 machine go non-responsive, a scene later ...

unix
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Linux advanced

NUMA in the Night: A Journey from Tail Latency to Locality

Hook: It was 3am when the pager woke the data hall. A Linux host in a multi‑tenant analytics cluster began exhibiting in...

linux
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Unix beginner

One-Liner to Save the Day: Surfacing the Heaviest Directories in a Sea of Logs

Picture this: Uber’s logs were exploding, with up to 200TB of Spark-generated data on a single busy day and a monthly mo...

unix
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Networking advanced

When Load Balancers Fail: The 15-Hour AWS Outage That Broke the Internet

On October 20, 2025, Amazon Web Services experienced a catastrophic 15-hour outage in their US-EAST-1 region that crippl...

infra scale networking
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