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Grid Computing with the Java Parallel Processing Framework

| by Jason Lai  Followers on Jul 18, 2006. Estimated reading time: 1 minute |

The Java Parallel Processing Framework (JPPF) has been making frequent point releases recently. Currently at version 0.22, it is designed to distribute application tasks over a cluster of computers and coordinate their execution in parallel.   JPPF is made up of a client layer in which client apps request task executions, a service layer/JPPF Driver that queues execution requests from the client layer which will be taken by available nodes to process asynchronously, along with load balancing and recovery capabilities, and an execution layer on each node of the computation grid responsible for executing atomic tasks in parallel whose code is dynamically loaded from the JPPF driver. 

Defining a task is straight forward:

public class MyTask extends JPPFTask
{
public void run()
{
 ... my code ...

setResult(theComputationResult);
}
}

Then, submitting a task for execution from client code looks like this:

public class MyTaskSubmitter
{
 //Submit the tasks and wait for their execution.
 public void submit() throws Exception
 {
JPPFClient jppfClient = new JPPFClient();
List taskList = new ArrayList();
taskList.add(new MyTask());

jppfClient.submit(taskList, null);
 }
}


The key features of JPPF include:

  • An API to delegate the processing of parallelized tasks to local and remote execution services
  • API and UI support for server administration and monitoring
  • Asynchronous communication model to support a high level of concurrency
  • Scalability up to an arbitrary number of processing nodes
  • Built-in failover and recovery for all components of the framework (clients, server and nodes)
  • The framework is deployment-free: no need to install your application/task code on a server, just connect to the server and any new code is automatically taken into account

Licensed under the terms of LGPL, JPPF is aimed to be an open source alternative to the grid computing solution, in addition to the existing ones such as Globus, Sun's Grid Engine and Teragrid.

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Why Not using JavaSpaces? by Shay Hassidim

JavaSpaces seems as a better fit here.
See GigaSpaces with advanced master/worker framework , HA , GUI and CLI tools etc.
Shay

Re: Why Not using JavaSpaces? by Cameron Purdy

JavaSpaces is not an easy API to use to build applications with.

The best api for work management might just be a WorkManager API ;-) .. you guys should check out both the IBM/BEA "commonj" APIs as well as the JSR 236/237 work that is a derivative of it. We've supported a grid implementation of WorkManager for a while now, and the feedback (ease of use, etc.) has been very positive.

Peace,

Cameron Purdy
Tangosol Coherence: The Java Data Grid

Re: Why Not using JavaSpaces? by ARI ZILKA

JavaSpaces is not an easy API to use to build applications with.

The best api for work management might just be a WorkManager API ;-) .. you guys should check out both the IBM/BEA "commonj" APIs as well as the JSR 236/237 work that is a derivative of it.


Very kewl suggestion Cameron. I love the Workmanager pattern, generally speaking. How do I get access to your grid implementation to play around with it?

Re: Why Not using JavaSpaces? by Guy Nirpaz

There are several legitimate APIs out there. One should distinguish API from implementation. The implementation is what provides effective parallelism; the API has to be flexible and useable.

Many people believe that a master/worker pattern based on Space semantics is adequate. For those who prefer a higher -level API, we offer Spring Remoting of the Space Based Architecture stack.

Guy Nirpaz
GigaSpaces: Write Once Scale Anywhere

Need to look more closely by ARI ZILKA

There are quite a few assumptions in this framework around how best to cluster. I am now concerned it might be a tad "too large." I will have to look into it more closely. Then again, my view of truly "simple" is--by now sounding like a broken record--true POJOs with nothing but the JDK or the JDK and Spring. I think Jonas Bonér offered up a very clean solution here:
www.theserverside.com/news/thread.tss?thread_id...

Re: Need to look more closely by mohd yaqub

I hope Terracotta solves this problem in a much simpler and cleaner way .

Re: Why Not using JavaSpaces? by Alexandre Verri

GigaSpaces is cool, but too expensive.

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