Re: what is its relationship to clustering (e.g. Hello Jamie, Thank you for your comments and question. Indeed, JPPF is not a cluster, but rather a computational grid framework. The generally agreed upon difference between clusters and grids is that clusters are made of a set of tightly coupled, homogeneous systems (hardware/OS/software) in a single location or complex, whereas grids are loosely coupled, heterogeneous and widely distributed in nature. In a larger definition, a grid provides access to computational and storage resources across organizational boundaries.
In effect, it virtualizes these resources from the user's perspective, as the user doesn't need to know what these resources are made of or where they are located to use them. A J2EE application server such as JBoss provides clustering capabilities. Its main goal is to serve a large number of relatively short-lived interactions (or transactions) with a large number of users. On the other hand, a computational grid will serve requests for long-lived intensive computations that can take hours or days or even longer to complete.
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