Mitsunori Komatsu komamitsu

Building (parts of) yugabyte locally

Yugabyte is best built inside of a docker container for the correct runtime environment mimicking the one the actual release is built with itself.

I found a suitable build environment by looking at the yb's CI scripts: https://github.com/yugabyte/yugabyte-db/blob/master/.github/workflows/build.yml.

Steps

Check out the source code.

libevent vs libuv

Comparing libevent and libuv. My upfront biased: I want to like libevent. However, I want to objectively compare the two and make an informed decision.

What versions are we comparing?

libevent 2.0.22 (Stable) [2014-01-05]
libuv 1.8.0 (Stable) [2015-12-15]

やわらか Consul

こわくないConsul

Setup

事前に、ワークショップ用のサンプルプロジェクトをチェックアウトし、VMの作成だけしておきましょう。 --no-provision でお願いします！

Presto connector development 1

One of the very good design decisions Presto designers made is that it's loosely coupled from storages.

Presto is a distributed SQL executor engine, and doesn't manager schema or metadata of tables by itself. It doesn't manage read data from storage by itself. Those businesses are done by plugins called Connector. Presto comes with Hive connector built-in, which connects Hive's metastore and HDFS to Presto.

We can connect any storages into Presto by writing connector plugins.

Plugin Architecture

MessagePackが文字列とバイナリをわけないのは問題？

msgpack/msgpack#121

Objective Cの実装使ってるとある問題にぶちあたった．なので，文字列をちゃんとバイナリ(Raw)と分けるべき，という提案

(*) 俺は熟読したわけではないので，中身が気になる人はちゃんと本スレを読みましょう

	module type Show = sig
	type t
	val show : t -> string
	end

	module ShowInt : Show with type t = int = struct
	type t = int

	let show = Int.to_string
	end

	--- ----------------- ----
	Map Quick Explanation Link
	--- ----------------- ----
	< <F1> Causes Netrw to issue help
	<cr> Netrw will enter the directory or read the file \|netrw-cr\|
	<del> Netrw will attempt to remove the file/directory \|netrw-del\|
	<c-h> Edit file hiding list \|netrw-ctrl-h\|
	<c-l> Causes Netrw to refresh the directory listing \|netrw-ctrl-l\|
	<c-r> Browse using a gvim server \|netrw-ctrl-r\|
	<c-tab> Shrink/expand a netrw/explore window \|netrw-c-tab\|

	<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>

	<!-- Replace the group ID with your group ID -->
	<groupId>com.mycompany.hadoopproject</groupId>
	<!-- Replace the artifact ID with the name of your project -->
	<artifactId>my-hadoop-project</artifactId>
	<version>1.0-SNAPSHOT</version>
	<packaging>jar</packaging>

	package indy;

	import java.lang.invoke.CallSite;
	import java.lang.invoke.ConstantCallSite;
	import java.lang.invoke.MethodHandle;
	import java.lang.invoke.MethodHandles;
	import java.lang.invoke.MethodType;
	import java.lang.reflect.Constructor;

	import org.objectweb.asm.ClassWriter;

	/*
	* Copyright (c) 2013 Calvin Rien
	*
	* Based on the JSON parser by Patrick van Bergen
	* http://techblog.procurios.nl/k/618/news/view/14605/14863/How-do-I-write-my-own-parser-for-JSON.html
	*
	* Simplified it so that it doesn't throw exceptions
	* and can be used in Unity iPhone with maximum code stripping.
	*
	* Permission is hereby granted, free of charge, to any person obtaining