Luiz junqueira

Design Patterns in Scala

Javaで多引数のコンストラクタを避けるために使われる Builder パターンは、Scala では名前付き引数呼び出しが使えるので必要ありません。

Builderパターンに制約を加えて条件に合わない場合、コンパイルエラーにしたい。

	#!/bin/bash

	# Put under /etc/autoMemoryReclaim.sh

	# set variables at the top
	low_cpu_usage=50 # Note: We work with integer percentages (e.g., 50%)
	idle_time=2 # Minutes
	cached_memory_limit=1000 # MB
	percent_memory_to_reclaim=5 # Percentage as an integer
	wait_period=3

	oc project kubernauts

	podname=$(oc get pods \| grep postgres-$(oc get dc postgres -o jsonpath='{.status.latestVersion}') \| grep -v deploy \| grep Running \| awk '{print $1}')
	oc rsh -c postgres $podname

	OR

	oc get pods \| grep postgres
	oc exec -it postgres-pod-name bash

	from starlette.applications import Starlette
	from starlette.routing import Route
	from starlette.responses import PlainTextResponse
	import httpx
	import aiohttp


	HOST, PORT = "localhost", 8000
	URL = f"http://{HOST}:{PORT}/"

	name := "HBaseDemo"

	version := "0.1"

	scalaVersion := "2.11.12"

	libraryDependencies += "com.typesafe" % "config" % "1.3.2"
	libraryDependencies += "org.apache.hadoop" % "hadoop-common" % "2.7.0"
	libraryDependencies += "org.apache.hadoop" % "hadoop-client" % "2.7.0"
	libraryDependencies += "org.apache.hbase" % "hbase-client" % "1.1.8"

	References: https://gist.github.com/noelboss/3fe13927025b89757f8fb12e9066f2fa
	More info: https://www.digitalocean.com/community/tutorials/how-to-use-git-hooks-to-automate-development-and-deployment-tasks
	https://www.youtube.com/watch?v=6mYtJu0E47U
	[misc commands deluser newuser]

	The following steps is for Developers to push their code from their local machine, to their server with git, and let git auto
	pull the update to your remote folder. How it works:
	- From your local machine, you do your normal coding. When done, you push your new code to git
	- Git then updates your local machine, and push it to your server's git
	- Git on your server gets the new update, and push it to your server's working folder

	---
	apiVersion: v1
	kind: ConfigMap
	metadata: {name: content}
	data:
	index.html: '<html><body><h1>Hello world</h1></body></html>'
	---
	apiVersion: apps/v1beta2
	kind: Deployment
	metadata: {name: lb}

	After automatically updating Postgres to 10.0 via Homebrew, the pg_ctl start command didn't work.
	The error was "The data directory was initialized by PostgreSQL version 9.6, which is not compatible with this version 10.0."

	Database files have to be updated before starting the server, here are the steps that had to be followed:

	# need to have both 9.6.x and latest 10.0 installed, and keep 10.0 as default
	brew unlink postgresql
	brew install [email protected]
	brew unlink [email protected]
	brew link postgresql

	package com.chetan.poc.hbase

	/**
	* Created by chetan on 24/1/17.
	*/
	import org.apache.spark._
	import org.apache.hadoop.hbase.{CellUtil, HBaseConfiguration, TableName}
	import org.apache.hadoop.hbase.mapreduce.TableInputFormat
	import org.apache.hadoop.hbase.util.Bytes
	import org.apache.hadoop.hbase.client._