prayagupa

// script can be loaded by ammonite (http://ammonite.io/)

import $plugin.$ivy.`org.spire-math::kind-projector:0.9.6`
import $ivy.`org.scalaz::scalaz-core:7.2.25`

import scalaz._
import Scalaz._
import scalaz.Maybe.Just

import scala.language.higherKinds

prayagupa

Client-side SSL

For excessively paranoid client authentication.

Using self-signed certificate.

Create a Certificate Authority root (which represents this server)

Organization & Common Name: Some human identifier for this server CA.

openssl genrsa -des3 -out ca.key 4096
openssl req -new -x509 -days 365 -key ca.key -out ca.crt

prayagupa

To generate a self-signed SSL certificate using the keytool command on Windows, Mac, or Linux:

   1 Open a command prompt or terminal.
   2 Run this command:

    keytool -genkey -keyalg RSA -alias tomcat -keystore selfsigned.jks -validity <days> -keysize 2048

    Where <days> indicate the number of days for which the certificate will be valid.

  3  Enter a password for the keystore. Note this password as you require this for configuring the server.

prayagupa

Producer

Setup
bin/kafka-topics.sh --zookeeper esv4-hcl197.grid.linkedin.com:2181 --create --topic test-rep-one --partitions 6 --replication-factor 1
bin/kafka-topics.sh --zookeeper esv4-hcl197.grid.linkedin.com:2181 --create --topic test --partitions 6 --replication-factor 3

Single thread, no replication

bin/kafka-run-class.sh org.apache.kafka.clients.tools.ProducerPerformance test7 50000000 100 -1 acks=1 bootstrap.servers=esv4-hcl198.grid.linkedin.com:9092 buffer.memory=67108864 batch.size=8196

prayagupa

var http = require('http'),
    fileSystem = require('fs'),
    path = require('path')
    util = require('util');

http.createServer(function(request, response) {
    var filePath = 'path_to_file.mp3';
    var stat = fileSystem.statSync(filePath);

    response.writeHead(200, {

prayagupa

Here is an example in Javascript based on a package I'm working on for Atom:

var format = '{%n  "commit": "%H",%n  "abbreviated_commit": "%h",%n  "tree": "%T",%n  "abbreviated_tree": "%t",%n  "parent": "%P",%n  "abbreviated_parent": "%p",%n  "refs": "%D",%n  "encoding": "%e",%n  "subject": "%s",%n  "sanitized_subject_line": "%f",%n  "body": "%b",%n  "commit_notes": "%N",%n  "verification_flag": "%G?",%n  "signer": "%GS",%n  "signer_key": "%GK",%n  "author": {%n    "name": "%aN",%n    "email": "%aE",%n    "date": "%aD"%n  },%n  "commiter": {%n    "name": "%cN",%n    "email": "%cE",%n    "date": "%cD"%n  }%n},';

var commits = [];

new BufferedProcess({
    command: 'git',
 args: [

prayagupa

Using core.async for Producer-consumer Systems

# Set up input file
repeat 10000 echo "." >> input

# Run inline
time lein run inline < input > output

# Run async

prayagupa

import akka.actor._
import com.eventstream.PackageArrivedEvent
import com.eventstream.publisher.PackageArrivedPublisher
import com.eventstream.subscriber.PackageArrivedSubscriber

object EventStreamApplication extends App {

  implicit val system = ActorSystem("event-stream")

prayagupa

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs

prayagupa

for (var i=0; i < 100000; i++) {
	db.mass_insert.save({
		"first_name": "James",
		"middle_name": "Richard",
		"last_name": "Windsgate",
		"email": "[email protected]"
	});
};