Yuvaraj L skyrocknroll

Job Anti-Affinity in Action

Overview

This guide will walk you through creating and executing a job that will demonstrate Nomad's job anti-affinity rules and, in clusters with memory limited Nomad clients, filtering based resource exhaustion.

Sample Environment

One Nomad Server Node
Three Nomad Client Nodes
- 768 MB RAM total (providing 761 MB RAM in nomad node-status -self)

Moved to git repository: https://github.com/denji/nginx-tuning

NGINX Tuning For Best Performance

For this configuration you can use web server you like, i decided, because i work mostly with it to use nginx.

Generally, properly configured nginx can handle up to 400K to 500K requests per second (clustered), most what i saw is 50K to 80K (non-clustered) requests per second and 30% CPU load, course, this was 2 x Intel Xeon with HyperThreading enabled, but it can work without problem on slower machines.

You must understand that this config is used in testing environment and not in production so you will need to find a way to implement most of those features best possible for your servers.

My thoughts on MessagePack

Hi. My name is Sadayuki "Sada" Furuhashi. I am the author of the MessagePack serialization format as well as its implementation in C/C++/Ruby.

Recently, MessagePack made it to the front page of Hacker News with this blog entry by Olaf, the creator of the Facebook game ZeroPilot. In the comment thread, there were several criticisms for the blog post as well as MessagePack itself, and I thought this was a good opportunity for me to address the questions and share my thoughts.

My high-level response to the comments

To the best of my understanding, roughly speaking, the criticisms fell into the following two categories.

References from my talk 'Without Resilience, Nothing Else Matters'

Types

A type is a collection of possible values. An integer can have values 0, 1, 2, 3, etc.; a boolean can have values true and false. We can imagine any type we like: for example, a HighFive type that allows the values "hi" or 5, but nothing else. It's not a string and it's not an integer; it's its own, separate type.

Statically typed languages constrain variables' types: the programming language might know, for example, that x is an Integer. In that case, the programmer isn't allowed to say x = true; that would be an invalid program. The compiler will refuse to compile it, so we can't even run it.

	##################### ElasticSearch Configuration Example #####################

	# This file contains an overview of various configuration settings,
	# targeted at operations staff. Application developers should
	# consult the guide at <http://elasticsearch.org/guide>.
	#
	# The installation procedure is covered at
	# <http://elasticsearch.org/guide/en/elasticsearch/reference/current/setup.html>.
	#
	# ElasticSearch comes with reasonable defaults for most settings,

	[agent]
	interval = "10s"
	round_interval = true
	metric_batch_size = 1000
	metric_buffer_limit = 10000
	collection_jitter = "0s"
	flush_interval = "10s"
	flush_jitter = "3s"
	precision = ""
	debug = false

	package main

	import (
	"io/ioutil"
	"log"

	"github.com/naoina/toml"
	"github.com/naoina/toml/ast"
	)

	package main

	import (
	"fmt"
	"github.com/codegangsta/negroni"
	"github.com/gorilla/mux"
	"log"
	"net/http"
	)


	#
	# Slightly tighter CORS config for nginx
	#
	# A modification of https://gist.github.com/1064640/ to include a white-list of URLs
	#
	# Despite the W3C guidance suggesting that a list of origins can be passed as part of
	# Access-Control-Allow-Origin headers, several browsers (well, at least Firefox)
	# don't seem to play nicely with this.
	#