A case study: Benchmarking PetStore in Java

Paint Data Matrix in Java A case study: Benchmarking PetStore

1.3 A case study: Benchmarking PetStore
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In 2002, the J2EE community found itself in the most tenuous position in its short history. As the founder of Java, Sun was no longer the unassailable giant. The company was under real attack from an increasingly competitive server marketplace, and the software strategy and execution, outside Java, had met with mixed results. Microsoft was also eager to cut into the J2EE marketplace, and in late 2002, that company managed a marketing coup.
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PetStore is a sample application written to show people how to use EJB . Designed to promote reuse over performance, PetStore offers none of the performance optimizations required for a typical benchmark. It s been updated several times, but still lacks fundamental techniques for achieving high performance, like a uniform caching strategy. And, as a sample available for most commercial and Open Source J2EE servers, PetStore is probably the most visible J2EE application. These factors made it an ideal target for a Microsoft benchmarking effort. Just as a hunting lion will separate the weakest and youngest antelope from the herd, Microsoft identified PetStore as a perfect candidate for a benchmarking contest. Microsoft asked the Middleware Company to step forward as the J2EE champion and to manage the J2EE implementation. The Middleware Company started with the original PetStore design, with JSP user interfaces accessing BMP entity beans through a session fa ade, and tuned the design to achieve a 17-fold increase in performance (figure 1.1). Still the Microsoft benchmark was nearly twice as fast. This benchmark was stacked in Microsoft s favor from the beginning for many reasons:
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The benchmark pitted old J2EE technology against recent Microsoft technology. At the time Microsoft performed its benchmark, one of the industry s leading J2EE engines did not support the latest J2EE performance and design enhancements. (The vendor names were never released, but many assume the non-supporting vendor was IBM.) Though the most popular application server used a much more recent version of J2EE, the benchmark used two-year-old technology, with few of the performance optimizations supported by EJB 2.0. The Microsoft design optimized performance, but the PetStore design was modular and loosely coupled, optimizing ease of maintenance over
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Figure 1.1 The original PetStore design adopted by the Middleware Company uses an ASP user interface to access Bean Managed Persistence entity beans through a session fa ade. Accessing the database directly from the fa ade would have been faster, but tougher to maintain.
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A case study: Benchmarking PetStore
performance. In particular, it used a full-service persistence layer. This decision was questionable, because the persistence was hand-coded as bean-managed persistence. Therefore, the benefits of using a persistence layer at all are unclear.
PetStore s original code base does not take advantage of many best practices that EJB developers have come to understand. As such, it may have been better to design the application from scratch, instead of starting from such a loose foundation.
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While the Middleware Company was tuning the original poor PetStore application, Microsoft Combined model wrote a version of PetStore from scratch, withand data access BMP entity beans layer out consideration of a multitiered approach. Microsoft did little to separate the data access layer from its business logic. It even cached full tables in memory! The code was tightly coupled and difficult to maintain, but brutally simple and effective. Without the overhead of a full-service persistence layer and with unrealistically Database aggressive caching, Microsoft s version of PetStore outperformed J2EE s PetStore by a factor of two (figure 1.2). It should have it was doing Figure 1.2 less than half of the work. By contrast, the Microsoft design accessed the database directly T h e in c e n di a r y r e sp o n s e s f r o m b o t h from the model logic. This design Microsoft and J2EE camps made immediate effectively tightly couples the claims and counter claims. Microsoft shouted business logic to the database. Removing one layer improves the Victory and immediately equipped their sales performance significantly, but staff with a PowerPoint presentation and report would make the application to take maximum advantage of the benchmark maintenance more difficult. results. On the other side, more than 30 critiques from major J2EE news services and independent consultants published scathing reviews of the Middleware Company s PetStore application. Microsoft representatives continued to use the report to full advantage while confusion reigned. So what should we make of the PetStore fiasco Obviously, the preponderance of evidence strongly suggests that the comparison between the original PetStore and Microsoft s redesign was not an equitable one. The Middleware Company has
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