Slides of my talk from #kcdaustria about debugging #golang apps inside #k8s cluster

https://drive.google.com/file/d/1-6ERQda23o7OiLHziz4wwgvdFWS0kyv8/view

And repo with samples/Dockerfiles for try it out!

https://github.com/andriisoldatenko/debugging-containerized-go-applications

Discussion of 1BRC in Go https://github.com/gunnarmorling/1brc/discussions/67

Context: https://twitter.com/gunnarmorling posted a problem https://www.morling.dev/blog/one-billion-row-challenge/ the idea is pretty simple and from another side not so simple:

>write a Java program for retrieving temperature measurement values from a text file and calculating the min, mean, and max temperature per weather station. There’s just one caveat: the file has 1,000,000,000 rows!

Go’s CompareAndSwap is not always Compare-and-swap

>Go's standard package sync/atomics provides programmers with functions to use the underlying CPU-level atomic operations such as compare-and-swap (CAS), through atomic.CompareAndSwapT (where T is an integer type).

> Problem: Not all CPU architectures offers a CAS instruction to rely on to implement atomic.CompareAndSwapT. However, Go must compile that function code to something semantically equivalent—let's see what.

https://lu.sagebl.eu/notes/go-cas/

Hiring Challenge: Smallest #golang Websocket Client

https://dyte.io/blog/hiring-challenge-smallest-golang-websocket-client/ by @dyte_io

Collections what's new in Go 1.22:

- slices.Concat https://blog.carlana.net/post/2024/golang-slices-concat/
- reflect.TypeFor https://blog.carlana.net/post/2024/golang-reflect-type-for/
- https://pkg.go.dev/cmp#Or
- https://pkg.go.dev/net/http@master#FileServerFS
- https://pkg.go.dev/database/sql#Null

proposal: reflect: add TypeAssert likely accepted 🎉 ')

https://github.com/golang/go/issues/62121

TIL: a % 128 = 0 is the same as a & 127 = 0

'Which is a faster operation since it just requires doing the AND and not the whole division and remainder comparison' @jesusvazquezp

from https://github.com/prometheus/prometheus/pull/14118#pullrequestreview-2068077407

How do you track code coverage for OSS projects?

codecov seems very flaky, (will provide some details in thread)

wdyt about https://github.com/vladopajic/go-test-coverage?tab=readme-ov-file

https://tip.golang.org/doc/go1.23#iterators uhhhh 🙃🙃🙃🙃

For all GO haters :) https://juli1.substack.com/p/why-i-fell-in-love-with-go

Nice quote and summary:
>Technologies like JavaScript or Go are like a good burger: it’s an option that the majority understand and choose regularly. It may not be the most elegant option, but it does the job and allows us to focus on problems that matter.

Providing context to cancellations in Go 1.20 with the new context WithCause API

https://josephwoodward.co.uk/2023/01/context-cancellation-cause-with-cancel-cause

and proposal https://github.com/golang/go/issues/51365

Dont forget to share your feedback about developing with Go ✍️

https://go.dev/blog/survey2024-h2

TIL: strings.Split returns [""] if s does not contain sep and sep is not empty 😅

package main

import (
  "fmt"
  "strings"
)

func main() {
  fmt.Printf("%q\n", strings.Split("", ","))
}

Split returns a slice of length 1 whose only element is s:

[""]