SYS-CON MEDIA Authors: Liz McMillan, Kevin Benedict, Zakia Bouachraoui, Elizabeth White, Pat Romanski

Blog Feed Post

Let’s Get Esper Up & Running

For our CEP in the Cloud example, I’ve briefly outlined a stream based load balancing idea.  In this example, RuleBots (pieces of code that do something – think of the procedural extensions built into some vendor’s products) send utilization statistics to the CEP Load Balancer via RabbitMQ.  The CEP Load Balancer in this case is written in Java and uses Esper to create a stream containing all available processes (destinations) in a particular service pool.

What’s a Service Pool?

For this example, we define a service pool as available compute resources in the cloud available to perform a particular service.  In our example, where we’re implementing map/reduce and the classic word count tutorial, our service pool name is “WordCountMap.”

How Does It Work?

Our Twitter OnRamp, which listens to the Twitter stream, will publish the tweet via RabbitMQ.  The RabbitMQ queue that the OnRamp will use as the destination will be retrieved from the CEP Load Balancer.

Why Is This Cool?

Because the CEP Load Balancer doesn’t need to know all that much about any particular process – only that it’s available to do work.  Also, the Twitter OnRamp doesn’t have to embody some load balancing algorithm.  So if we decide to change how we do load balancing in our word count example, we make the change in one place.  And by avoiding partitioning at the RuleBot level, we maintain some flexibility – more processing power required?  Add processes and there’s no need to stop services, re-partition, and restart the services.  Easy peasy!

Esper Code

Here’s some example Esper code – load this up to get started.  We’ll modify it over time.  In the next installment, we’ll modify this code to receive utilization statistics from RuleBots. (if anyone knows a better way to make code look better in my posts, let me know – my html ‘code’ formatting doesn’t seem to be working – wordpress 2.9.2).

import com.espertech.esper.client.*;
import java.util.Random;
import java.util.Date;

import org.apache.log4j.ConsoleAppender;
import org.apache.log4j.SimpleLayout;
import org.apache.log4j.Level;
import org.apache.log4j.Logger;

public class CEPLoadBalancer {

public static class Utilization {
String destination;
String servicePool;
Double load;
Date timeStamp;

public Utilization(String Des, String Ser, Double Ld, long t) {
destination = Des;
servicePool = Ser;
load = Ld;
timeStamp = new Date(t);
}

public String getDestination() {return destination;}
public String getServicePool() {return servicePool;}
public Double getLoad() {return load;}
public Date getTimeStamp() {return timeStamp;}

@Override
public String toString() {
return "Destination: " + destination + " ServicePool: " + servicePool + " Load " + load.toString()+ " Time " + timeStamp.toString();
}
}

private static Random generator = new Random();

public static void GenerateRandomUtilization(EPRuntime cepRT) {

// first map server
double load = (double) generator.nextInt(10);
long timeStamp = System.currentTimeMillis();
String destination = "MAP01";
String servicePool = "WordCountMap";
// create utililzation event
Utilization util = new Utilization( destination, servicePool, load, timeStamp);
cepRT.sendEvent(util);

// second map server
destination = "MAP02";
load = (double) generator.nextInt(10);
timeStamp = System.currentTimeMillis();
util = new Utilization( destination, servicePool, load, timeStamp);
cepRT.sendEvent(util);
}

public static class CEPListener implements UpdateListener {

public void update(EventBean[] newData, EventBean[] oldData) {
System.out.println("Event received: " + newData[0].getUnderlying());
}
}

public static void main(String[] args) {
SimpleLayout layout = new SimpleLayout();
ConsoleAppender appender = new ConsoleAppender(new SimpleLayout());
Logger.getRootLogger().addAppender(appender);
Logger.getRootLogger().setLevel((Level) Level.WARN);

Configuration cepConfig = new Configuration();
cepConfig.addEventType("Util", Utilization.class.getName());
EPServiceProvider cep = EPServiceProviderManager.getProvider("myCEPEngine", cepConfig);
EPRuntime cepRT = cep.getEPRuntime();

EPAdministrator cepAdm = cep.getEPAdministrator();
EPStatement cepStatement = cepAdm.createEPL("select * from Util.win:length(5)");

cepStatement.addListener(new CEPListener());

// simulate loads
for (int i = 0; i < 10; i++) {
GenerateRandomUtilization(cepRT);
}
}
}

Read the original blog entry...

More Stories By Colin Clark

Colin Clark is the CTO for Cloud Event Processing, Inc. and is widely regarded as a thought leader and pioneer in both Complex Event Processing and its application within Capital Markets.

Follow Colin on Twitter at http:\\twitter.com\EventCloudPro to learn more about cloud based event processing using map/reduce, complex event processing, and event driven pattern matching agents. You can also send topic suggestions or questions to [email protected]

Latest Stories
Cognitive Computing is becoming the foundation for a new generation of solutions that have the potential to transform business. Unlike traditional approaches to building solutions, a cognitive computing approach allows the data to help determine the way applications are designed. This contrasts with conventional software development that begins with defining logic based on the current way a business operates. In her session at 18th Cloud Expo, Judith S. Hurwitz, President and CEO of Hurwitz & ...
The Jevons Paradox suggests that when technological advances increase efficiency of a resource, it results in an overall increase in consumption. Writing on the increased use of coal as a result of technological improvements, 19th-century economist William Stanley Jevons found that these improvements led to the development of new ways to utilize coal. In his session at 19th Cloud Expo, Mark Thiele, Chief Strategy Officer for Apcera, compared the Jevons Paradox to modern-day enterprise IT, examin...
"Cloud computing is certainly changing how people consume storage, how they use it, and what they use it for. It's also making people rethink how they architect their environment," stated Brad Winett, Senior Technologist for DDN Storage, in this SYS-CON.tv interview at 20th Cloud Expo, held June 6-8, 2017, at the Javits Center in New York City, NY.
"NetApp's vision is how we help organizations manage data - delivering the right data in the right place, in the right time, to the people who need it, and doing it agnostic to what the platform is," explained Josh Atwell, Developer Advocate for NetApp, in this SYS-CON.tv interview at 20th Cloud Expo, held June 6-8, 2017, at the Javits Center in New York City, NY.
Sold by Nutanix, Nutanix Mine with Veeam can be deployed in minutes and simplifies the full lifecycle of data backup operations, including on-going management, scaling and troubleshooting. The offering combines highly-efficient storage working in concert with Veeam Backup and Replication, helping customers achieve comprehensive data protection for all their workloads — virtual, physical and private cloud —to meet increasing business demands for uptime and productivity.
The Software Defined Data Center (SDDC), which enables organizations to seamlessly run in a hybrid cloud model (public + private cloud), is here to stay. IDC estimates that the software-defined networking market will be valued at $3.7 billion by 2016. Security is a key component and benefit of the SDDC, and offers an opportunity to build security 'from the ground up' and weave it into the environment from day one. In his session at 16th Cloud Expo, Reuven Harrison, CTO and Co-Founder of Tufin, ...
While the focus and objectives of IoT initiatives are many and diverse, they all share a few common attributes, and one of those is the network. Commonly, that network includes the Internet, over which there isn't any real control for performance and availability. Or is there? The current state of the art for Big Data analytics, as applied to network telemetry, offers new opportunities for improving and assuring operational integrity. In his session at @ThingsExpo, Jim Frey, Vice President of S...
Rodrigo Coutinho is part of OutSystems' founders' team and currently the Head of Product Design. He provides a cross-functional role where he supports Product Management in defining the positioning and direction of the Agile Platform, while at the same time promoting model-based development and new techniques to deliver applications in the cloud.
In his keynote at 18th Cloud Expo, Andrew Keys, Co-Founder of ConsenSys Enterprise, provided an overview of the evolution of the Internet and the Database and the future of their combination – the Blockchain. Andrew Keys is Co-Founder of ConsenSys Enterprise. He comes to ConsenSys Enterprise with capital markets, technology and entrepreneurial experience. Previously, he worked for UBS investment bank in equities analysis. Later, he was responsible for the creation and distribution of life settl...
"We were founded in 2003 and the way we were founded was about good backup and good disaster recovery for our clients, and for the last 20 years we've been pretty consistent with that," noted Marc Malafronte, Territory Manager at StorageCraft, in this SYS-CON.tv interview at 20th Cloud Expo, held June 6-8, 2017, at the Javits Center in New York City, NY.
DevOps is often described as a combination of technology and culture. Without both, DevOps isn't complete. However, applying the culture to outdated technology is a recipe for disaster; as response times grow and connections between teams are delayed by technology, the culture will die. A Nutanix Enterprise Cloud has many benefits that provide the needed base for a true DevOps paradigm. In their Day 3 Keynote at 20th Cloud Expo, Chris Brown, a Solutions Marketing Manager at Nutanix, and Mark Lav...
@CloudEXPO and @ExpoDX, two of the most influential technology events in the world, have hosted hundreds of sponsors and exhibitors since our launch 10 years ago. @CloudEXPO and @ExpoDX New York and Silicon Valley provide a full year of face-to-face marketing opportunities for your company. Each sponsorship and exhibit package comes with pre and post-show marketing programs. By sponsoring and exhibiting in New York and Silicon Valley, you reach a full complement of decision makers and buyers in ...
There are many examples of disruption in consumer space – Uber disrupting the cab industry, Airbnb disrupting the hospitality industry and so on; but have you wondered who is disrupting support and operations? AISERA helps make businesses and customers successful by offering consumer-like user experience for support and operations. We have built the world’s first AI-driven IT / HR / Cloud / Customer Support and Operations solution.
Historically, some banking activities such as trading have been relying heavily on analytics and cutting edge algorithmic tools. The coming of age of powerful data analytics solutions combined with the development of intelligent algorithms have created new opportunities for financial institutions. In his session at 20th Cloud Expo, Sebastien Meunier, Head of Digital for North America at Chappuis Halder & Co., discussed how these tools can be leveraged to develop a lasting competitive advantage ...
LogRocket helps product teams develop better experiences for users by recording videos of user sessions with logs and network data. It identifies UX problems and reveals the root cause of every bug. LogRocket presents impactful errors on a website, and how to reproduce it. With LogRocket, users can replay problems.