Archive • Updates from varoa.net • Buttondown

Migrating an Eureka-based microservice fleet to Kubernetes

February 12, 2020

I have published some articles recently related to the Kubernetes-based PaaS that my team builds for the engineers behind the online marketplaces of...

Talk write-up: "How to build a PaaS for 1500 engineers"

January 2, 2020

This article is based on a presentation I gave as part of AdevintaTalks in Barcelona on November 2019. I’m experimenting with this format: I went through the...

Kubernetes made my latency 10x higher

October 22, 2019

Update: it looks this post has gotten way more attention than I anticipated. I’ve seen / received feedback that the title is misleading and some people get...

Sizing Kubernetes pods for JVM apps without fearing the OOM Killer

Lately at work I’ve been helping out some teams migrating their workloads from on-prem / EC2 infrastructure to Kubernetes. It’s being a good boot camp on...

GC forensics by example: multi-second pauses and allocation pressure

This post will analyze a Hotspot GC log exhibiting large GC pauses (> 1 min) leading to allocation pressure and system load as a cause of pathological...

How does the default hashCode() work?

January 30, 2017

In which scratching the surface of hashCode() leads to a speleology trip through the JVM source reaching object layout, biased locking, and surprising...

Contention on sun.misc.Cleaner

August 28, 2016

I found recently a (dying) JVM with about 10 threads BLOCKED on the sun.misc.Cleaner class instance. This was not the root cause of the failure, but I could...

How does the JVM change tenuring thresholds, and when?

On a recent Tuesday evening I ran into this 3 year old JVM question in Stack Overflow. GC features and its many knobs are profusely documented (search...