Kihwan Kim superhuman54

20181108 SpringOne Tour - Seoul, By Pivotal

Table of Contents

한눈에 보는 정리

한눈에 보는 정리

코틀린을 이용해도 스프링 프레임워크는 잘 동작한다는 것
- 코드도 간결하고
- 맥북은 영어로만 코딩하면 빠르군. 한영 변환 비용은 꽤 비싸다.
피보탈에서 '클라우드 네이티브(Cloud Native)' 에다가 '리액티브(Reactive)' 를 얹었고

Spark internals through code

Nothing gives you more detail about spark internals than actually reading it source code. In addition, you get to learn many design techniques and improve your scala coding skills. These are the random notes I make while reading the spark code. The best way to comprehend the notes is to load spark code into an IDE, e.g. IntelliJ, and navigate the code on the side.

Genesis - creation of a spark cluster

The scripts for creating a spark cluster are: start-master.sh and start-slave.sh. Read them carefully, and you can see that both scripts are very similar except the values for $CLASS variable. For start-master.sh, the value is CLASS="org.apache.spark.deploy.master.Master", while the value for start-slave.sh is shown below with more context.

# NOTE: This exact class name is matched downstream by SparkSubmit.

Regular Event Loop

This shows the execution order given JavaScript's Call Stack, Event Loop, and any asynchronous APIs provided in the JS execution environment (in this example; Web APIs in a Browser environment)

Given the code

	// https://twitter.github.io/scala_school/type-basics.html
	// 트위터 스칼라 스쿨에 나오는 자료구조를 활용해보겠다.

	class Animal { val sound = "rustle" }
	class Bird extends Animal { override val sound = "call" }
	class Chicken extends Bird { override val sound = "cluck" }
	class Duck extends Bird { override val sound = "duck" }

	def foo(tweet: Bird => String) = {
	tweet(new Bird)

	# ---------------------------------------------------------------------------
	#
	# Description: This file holds all my BASH configurations and aliases.
	# Much of this was originally copied from:
	# http://natelandau.com/my-mac-osx-bash_profile/
	#
	# Sections:
	# 1. Environment Configuration
	# 2. Make Terminal Better (remapping defaults and adding functionality)
	# 3. File and Folder Management