Vertx in production

PRODUCTION READY VERT.X
Berlin | 30.04.2014

TABLE OF CONTENTS
1. Introduction
2. The Beginning
3. What is Vert.x?
4. How to start?
5. Infrastructure as code
6. Vert.x module system
7. Integration with messaging system
8. Kafka module
2Berlin | 2014 | zanox | JUG BB

INTRODUCTION ZANOX
Europe‘s leading performance advertising network

THE BEGINNING
Java Magazin 04.14:
Vert.x im Unternehmenseinsatz
Entwicklung und Betrieb von
asynchronen Applikationen mit Vert.x in
der Praxis

THE BEGINNING
● New request processing-system for Zanox
● Requirements are pretty high (not negotiable):
● Low latency
● High throughput
● Scalable
● Resilient
● Responsive
● Event-Driven
● Fast

THE BEGINNING

“Vert.x is a lightweight, high performance application
platform for the JVM that's designed for modern
mobile, web, and enterprise applications.”
Vert.x
WHAT IS VERT.X?

WHAT IS VERT.X?
Polyglot

WHAT IS A VERTICLE?
● Classes with an own Classloader
● operates Single Threaded
● executed by an Event Loop

Event Loop Pool
Event Bus
V V V W W W
TAKE A LOOK INSIDE

WHAT‘S DEEP INSIDE?
● Build on top of Netty 4
● Uses Hazelcast for node discovery
● Jackson for JSON
● Java7+

HOW TO START?
● Prerequisite: JDK 7
● download and unzip file from vertx.io
● put /bin directory to PATH variable

HOW TO START?
● mvn archetype:generate -Dfilter=io.vertx:
(do not forget the colon!)
● generates structure for all languages (JS, Ruby,
Groovy, Python)
● maven pom is already set with relevant data

HOW TO START?

BEST PRACTICES

BEST PRACTICES
● do not block the loop
● put blocking code or extensive computation into
worker verticles
● keep the application responsive
● stress test as often as possible
● encapsulate common code in modules (more on this
later)

INFRASTRUCTURE AS CODE

"CHEF IS LIKE A LITTLE SYSTEM
ADMIN ROBOT ... YOU TELL IT
HOW YOU WANT YOUR SYSTEM
CONFIGURED, AND IT WILL DO ALL
THE DIRTY WORK.”

Chef Cookbook

VERT.X MODULE SYSTEM
● Vert.x has a powerful module system.
● Package your Vert.x components into modules for
encapsulation and reuse.
● The module is a zip file
● It can be just plugged in into your application

VERT.X MODULE SYSTEM
● Share your modules with the community by putting
them in Maven Central, any other Maven repository, or
in Bintray.
● Advertise your module in the module registry.

VERT.X MODULE REGISTRY
● Just fill in the form and wait for approval:

INTEGRATION WITH MESSAGING
SYSTEM
● Apache Kafka is a publish-subscribe messaging
implemented as a distributed commit log.
● Fast
● Scalable
● Durable
● Distributed
25
KAFKA MESSAGING SYSTEM
Berlin | 2014 | zanox | JUG BB

INTEGRATION WITH MESSAGING
SYSTEM
● Topic - categories for feeds of messages
● Producer - publishes messages to topics
● Consumer - subscribes to topics and process the feed
of published messages consumers
● Broker - Kafka is run as a cluster comprised of one or
more servers each of which is called a broker.
26
MAIN TERMINOLOGY:

KAFKA MODULE
● Application sends messages to Kafka module using
Vert.x event bus
● Kafka module acts as a producer
● Available on Maven Central and Vert.x module registry

KAFKA MODULE IN MODULE REGISTRY
Open sourced Kafka module in Vert.x’s module registry -
http://modulereg.vertx.io/

USING VERT.X MODULE
First, deploy the module into your application:
container.deployModule("com.zanox.vertx~mo
d-kafka~1.0.2", config);

USING KAFKA MODULE
JsonObject config = new JsonObject();
config.putString("kafka-topic", „kafka_topic“);
config.putString("metadata.broker.list",
“localhost:9092”);
config.putString("request.required.acks", "1");
30
CONFIGURATION IS A JSON OBJECT:

METRICS OF VERT.X PROJECT
● On 4 Cores virtual machine we had the following
results:
● ~28 K requests per second without Kafka, with
lookup from Redis
● ~18 K requests per second with Kafka and lookup
from Redis

Vertx in production

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