Jules Ivanic guizmaii

Memory LIMIT and REQUEST in Containers and JVM

Do you run a JVM inside a container on Kubernetes (or maybe OpenShift)?
Do you struggle with REQUEST and LIMIT parameters?
Do you know the impact of those parameters on your JVM?
Have you met OOM Killer?

Hope you will find answers to these questions in this example-based article.

How to set up JVM Heap size in a Container

Greasing the Skids: Building Remote Teams

In the wake of the virus that-must-not-be-named (which most people misname anyway), it seems like everyone and their cat has posted some sort of opinion or how-to on making remote work, work. This is a good thing! Working remotely, particularly full-time, is hard! I've done it for my entire career (aside from an odd 14 month office period in the middle that we shall not speak of), but more relevantly, for the past two years I've been responsible for building, managing, and enabling an entirely remote team, distributed across nine timezones. Remote teams don't just happen by installing Slack and telling everyone to work on their couch: they require a lot of effort to do correctly and efficiently. But, done right, it can be a massive multiplier on your team efficiency and flexibility.

Here's how we do it. I'm going to attempt to structure this post more towards management than engineering, and so I apologize in advance if I assume terminology or knowledge which

Publish

Add the following configuration to your build.sbt:

  // publish to github packages settings
  publishTo := Some("GitHub <GITHUB_OWNER> Apache Maven Packages" at "https://maven.pkg.github.com/<GITHUB_OWNER>/<GITHUB_PROJECT>"),
  publishMavenStyle := true,
  credentials += Credentials(
    "GitHub Package Registry",

Things I believe

This is a collection of the things I believe about software development. I have worked for years building backend and data processing systems, so read the below within that context.

Agree? Disagree? Feel free to let me know at @JanStette. See also my blog at www.janvsmachine.net.

Fundamentals

Keep it simple, stupid. You ain't gonna need it.

	/**
	* Scala 2 encoding for the union type `T \| Null`
	*
	* This encoding implementation is copied from the implementation of [[scala.Option]]
	*
	* See tweets to see the explored encodings: https://twitter.com/guizmaii/status/1481530910290100227?s=20
	*
	* Why do we need this weird type? See https://twitter.com/guizmaii/status/1481543904734617601?s=20
	*/
	sealed abstract class Nullable[+A] extends Product with Serializable {

	package cqrs
	package eventstore

	import zio.*
	import zio.prelude.*
	import zio.prelude.fx.*

	object BaseSyntax:

	type Program[S, R, E, A] = ZPure[Nothing, S, S, R, E, A]

	trait Instance[T] {
	def t: T
	}
	object Instance {
	def apply[T](v: T): Instance[T] = new Instance[T] { override def t: T = v }
	}

	sealed trait Typed {
	type T
	}

	rules = [
	Disable
	DisableSyntax
	ExplicitResultTypes
	LeakingImplicitClassVal
	NoAutoTupling
	NoValInForComprehension
	ProcedureSyntax
	RemoveUnused
	MissingFinal

	package com.guizmaii.utils

	import java.nio.charset.{Charset, StandardCharsets}
	import java.security.{Key, SecureRandom}

	import cats.effect.Sync
	import doobie.{Put, Read}
	import eu.timepit.refined.types.all.NonEmptyString
	import io.estatico.newtype.macros.newtype
	import javax.crypto.{Cipher, SecretKey, SecretKeyFactory}

	package spray.json

	import cats.Show
	import io.circe.Decoder.Result
	import io.circe.{Codec, DecodingFailure, HCursor, Json}

	import scala.util.control.NonFatal

	trait CorrectDefaultJsonProtocol extends DefaultJsonProtocol {