Welcome!

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
"Digital transformation - what we knew about it in the past has been redefined. Automation is going to play such a huge role in that because the culture, the technology, and the business operations are being shifted now," stated Brian Boeggeman, VP of Alliances & Partnerships at Ayehu, in this SYS-CON.tv interview at 21st Cloud Expo, held Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA.
The past few years have brought a sea change in the way applications are architected, developed, and consumed—increasing both the complexity of testing and the business impact of software failures. How can software testing professionals keep pace with modern application delivery, given the trends that impact both architectures (cloud, microservices, and APIs) and processes (DevOps, agile, and continuous delivery)? This is where continuous testing comes in. D
"Evatronix provides design services to companies that need to integrate the IoT technology in their products but they don't necessarily have the expertise, knowledge and design team to do so," explained Adam Morawiec, VP of Business Development at Evatronix, in this SYS-CON.tv interview at @ThingsExpo, held Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA.
"WineSOFT is a software company making proxy server software, which is widely used in the telecommunication industry or the content delivery networks or e-commerce," explained Jonathan Ahn, COO of WineSOFT, in this SYS-CON.tv interview at 21st Cloud Expo, held Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA.
Smart cities have the potential to change our lives at so many levels for citizens: less pollution, reduced parking obstacles, better health, education and more energy savings. Real-time data streaming and the Internet of Things (IoT) possess the power to turn this vision into a reality. However, most organizations today are building their data infrastructure to focus solely on addressing immediate business needs vs. a platform capable of quickly adapting emerging technologies to address future ...
Mobile device usage has increased exponentially during the past several years, as consumers rely on handhelds for everything from news and weather to banking and purchases. What can we expect in the next few years? The way in which we interact with our devices will fundamentally change, as businesses leverage Artificial Intelligence. We already see this taking shape as businesses leverage AI for cost savings and customer responsiveness. This trend will continue, as AI is used for more sophistica...
There is a huge demand for responsive, real-time mobile and web experiences, but current architectural patterns do not easily accommodate applications that respond to events in real time. Common solutions using message queues or HTTP long-polling quickly lead to resiliency, scalability and development velocity challenges. In his session at 21st Cloud Expo, Ryland Degnan, a Senior Software Engineer on the Netflix Edge Platform team, will discuss how by leveraging a reactive stream-based protocol,...
In his Opening Keynote at 21st Cloud Expo, John Considine, General Manager of IBM Cloud Infrastructure, led attendees through the exciting evolution of the cloud. He looked at this major disruption from the perspective of technology, business models, and what this means for enterprises of all sizes. John Considine is General Manager of Cloud Infrastructure Services at IBM. In that role he is responsible for leading IBM’s public cloud infrastructure including strategy, development, and offering m...
Sanjeev Sharma Joins June 5-7, 2018 @DevOpsSummit at @Cloud Expo New York Faculty. Sanjeev Sharma is an internationally known DevOps and Cloud Transformation thought leader, technology executive, and author. Sanjeev's industry experience includes tenures as CTO, Technical Sales leader, and Cloud Architect leader. As an IBM Distinguished Engineer, Sanjeev is recognized at the highest levels of IBM's core of technical leaders.
Product connectivity goes hand and hand these days with increased use of personal data. New IoT devices are becoming more personalized than ever before. In his session at 22nd Cloud Expo | DXWorld Expo, Nicolas Fierro, CEO of MIMIR Blockchain Solutions, will discuss how in order to protect your data and privacy, IoT applications need to embrace Blockchain technology for a new level of product security never before seen - or needed.
The 22nd International Cloud Expo | 1st DXWorld Expo has announced that its Call for Papers is open. Cloud Expo | DXWorld Expo, to be held June 5-7, 2018, at the Javits Center in New York, NY, brings together Cloud Computing, Digital Transformation, Big Data, Internet of Things, DevOps, Machine Learning and WebRTC to one location. With cloud computing driving a higher percentage of enterprise IT budgets every year, it becomes increasingly important to plant your flag in this fast-expanding busin...
Digital transformation is about embracing digital technologies into a company's culture to better connect with its customers, automate processes, create better tools, enter new markets, etc. Such a transformation requires continuous orchestration across teams and an environment based on open collaboration and daily experiments. In his session at 21st Cloud Expo, Alex Casalboni, Technical (Cloud) Evangelist at Cloud Academy, explored and discussed the most urgent unsolved challenges to achieve f...
SYS-CON Events announced today that Synametrics Technologies will exhibit at SYS-CON's 22nd International Cloud Expo®, which will take place on June 5-7, 2018, at the Javits Center in New York, NY. Synametrics Technologies is a privately held company based in Plainsboro, New Jersey that has been providing solutions for the developer community since 1997. Based on the success of its initial product offerings such as WinSQL, Xeams, SynaMan and Syncrify, Synametrics continues to create and hone inn...
Digital Transformation (DX) is not a "one-size-fits all" strategy. Each organization needs to develop its own unique, long-term DX plan. It must do so by realizing that we now live in a data-driven age, and that technologies such as Cloud Computing, Big Data, the IoT, Cognitive Computing, and Blockchain are only tools. In her general session at 21st Cloud Expo, Rebecca Wanta explained how the strategy must focus on DX and include a commitment from top management to create great IT jobs, monitor ...
In a recent survey, Sumo Logic surveyed 1,500 customers who employ cloud services such as Amazon Web Services (AWS), Microsoft Azure, and Google Cloud Platform (GCP). According to the survey, a quarter of the respondents have already deployed Docker containers and nearly as many (23 percent) are employing the AWS Lambda serverless computing framework. It’s clear: serverless is here to stay. The adoption does come with some needed changes, within both application development and operations. Tha...