Igor Zinin izinin

Kubernetes clusters using preemtible instances

Motivation

People experimenting with kubernetes clusters on the GKE not necessarily have money to keep a full cluster on at all time. GKE clusters can be easily resized, but this still incurs in the full instance cost when the cluster is up.

Google has added preemptible instances that are ideal for many

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Purpose

This section outlines the necessary steps to write a simple native "Hello World!" JNI-enabled Android application.
This section assumes you have read and followed the steps in Compiling C/C++ code directly from Android Studio

Writing JNI functions

Create a new Android Studio project. To do so, select File -> New -> New Project.

edit

@akash-akya pointed out in the comments that the file module supports named pipes since OTP 20. So none of this post is really needed anymore if you are on >= OTP 21.

Erlang and Named Pipes

The intention of this post is to provide a solution (with examples) to a somewhat uncommon issue in Erlang. I hate searching for answers to the same problems over and over, and I had a hard time finding answers to this particular problem, so I wrote it all down once I figured it out. If one day you decide to read and write data through fifo's (named pipes) and then decide you want to read or write the other end of the pipe from Erlang, this post is for you.

	import java.util.logging.Logger;

	import javax.servlet.http.HttpServletRequest;
	import javax.ws.rs.GET;
	import javax.ws.rs.Path;
	import javax.ws.rs.Produces;
	import javax.ws.rs.QueryParam;
	import javax.ws.rs.core.Context;
	import javax.ws.rs.core.Response;


	import * as request from 'request';
	import * as fs from 'fs';
	import * as readline from 'readline';
	var google = require('googleapis');
	var googleAuth = require('google-auth-library');

	/*************** STEPS

	- made a project on https://console.cloud.google.com/cloudpubsub/topicList?project=testmabs thing?

	// sending to sender-client only
	socket.emit('message', "this is a test");

	// sending to all clients, include sender
	io.emit('message', "this is a test");

	// sending to all clients except sender
	socket.broadcast.emit('message', "this is a test");

	// sending to all clients in 'game' room(channel) except sender

	/*
	* HTTP POST with chunked encoding.
	*
	* Usage:
	* cc chunkedpost.c -lcurl -o chunkedpost
	* ./chunkedpost
	*
	*/
	#include <stdio.h>
	#include <stdlib.h>

	import javax.inject.Singleton;
	import javax.ws.rs.container.ContainerRequestContext;
	import javax.ws.rs.container.ContainerResponseContext;
	import javax.ws.rs.container.ContainerResponseFilter;
	import javax.ws.rs.core.MultivaluedMap;
	import javax.ws.rs.ext.Provider;
	import java.io.IOException;

	@Singleton
	@Provider

	/node_modules
	/dist