Click here to close now.


Microservices Expo Authors: Chris Witeck , Deep Bhattacharjee, Elizabeth White, Greg O'Connor, PagerDuty Blog

Related Topics: Microservices Expo

Microservices Expo: Article

ESB Myth Busters: 10 Enterprise Service Bus Myths Debunked

Clarity of Definition for a Growing Phenomenon

Myth #2: Microsoft is building an ESB with their "Indigo" project.
Microsoft's Indigo combines Microsoft's Messaging Queuing, its Component Object Model COM+, .NET, and Web services. What they are building is a message bus with Web services extensions. This is very different from an enterprise bus. A messaging bus exposes the details of lower-level messaging techniques and requires the writing of code to define the relationships between applications and services. The mantra of the ESB is configuration rather than coding, which removes the necessity of hardwiring relationships between interconnected applications. An ESB facilitates and promotes the use of loose coupling between applications, which are exposed through the bus as event-driven services. The good news here is that applications built on Indigo will at least be message based and therefore easier to integrate through an ESB.

That said, there are elements of the BizTalk Server that, correctly combined with Indigo, could start to look like an ESB. However, there is one missing element in the formula, in that BizTalk is still a hub-and-spoke integration broker and is subject to all of the caveats mentioned in the ESB versus EAI discussion. You can't split out the XML transformation engine from the rest of the BizTalk Server and expect to run it as a load-balanced service across multiple machines without incurring the cost and overhead of the entire Biztalk Server (see the previous discussion on EAI vs. ESB).

Myth #3: The adoption of WS-* specifications, such as WS-Reliability and WS-Reliable Messaging, obviate the need for an ESB.
An ESB should be designed to accommodate these evolving specifications as they become mature and achieve commercial viability. Evolving WS-* specifications will help make application endpoints more interoperable through an ESB.

As part of the evolving standards process of Web services specifications, there exists much uncertainty due to the many overlapping efforts underway. As these specifications mature and achieve widespread adoption, they will still require an infrastructure to support them. An ESB can provide a consistent model for building, orchestrating, and managing SOAs, while insulating the IT organization from changes in underlying interoperability standards.

A WS-Reliability implementation requires that there be an industry-proven reliable message persistence and store-and-forward processor to support it. A foundational component of an ESB is an enterprise messaging layer that provides quality of service of message delivery through messaging conventions such as message persistence, store- and-forward delivery, message acknowledgements, and interfaces with external XA-compliant transaction managers. The ESB implementation may also provide transparent routing of messages across sophisticated network topologies, and continuous availability of the messaging infrastructure through a fault-tolerant messaging server architecture. The science of making all of this work together to ensure reliability under high-stress enterprise environments requires many person-years of effort to get right.

That being said, ESBs that are implemented today using a proprietary messaging layer should also adopt one or more of the WS-Rel* as additional protocols or "on-ramps" for getting on and off the bus. However, it is not a one-size-fits-all solution and many combinations of messaging and protocol support are necessary.

More Stories By Dave Chappell

David Chappell is vice president and chief technologist for SOA at Oracle Corporation, and is driving the vision for Oracle’s SOA on App Grid initiative.

Comments (8) View Comments

Share your thoughts on this story.

Add your comment
You must be signed in to add a comment. Sign-in | Register

In accordance with our Comment Policy, we encourage comments that are on topic, relevant and to-the-point. We will remove comments that include profanity, personal attacks, racial slurs, threats of violence, or other inappropriate material that violates our Terms and Conditions, and will block users who make repeated violations. We ask all readers to expect diversity of opinion and to treat one another with dignity and respect.

Most Recent Comments
Charlesy 07/03/13 07:28:00 AM EDT

An old post, but worth a small correction. Comparison with competitor products is always dangerous. You need to be very sure of your territory, and unfortunately, although David's description of BizTalk Server has some validity, it isn't 100% accurate. For example, the transformation services absolutely can be invoked separately to the rest of BTS via lightweight services, and load balanced across different boxes. More recent versions of BTS provide pre-built generic WCF and ASMX transformation web services as a courtesy to developers (reduces the need to build custom transformation services). You can use Windows Server AppFabric tools to create BizTalk maps in non-BizTalk projects - e.g., projects that define lightweight transformation services.

David doesn't clearly spell out what he means by 'cost...of the entire BizTalk Server'. If he means licencing cost, then he hits the mark, somewhat. BTS is certainly licensed in a fashion that encourages distribution and load balancing over a small farm of centralized servers, in contrast to the highly distributed approach advocated by Sonic. You can only invoke BTS transformation services on licensed boxes, so from that perspective, he is correct. However, invoking the transformation services does not require loading additional irrelevant BTS plumbing into memory. There is no heavy-weight performance cost imposed by code bloat, or anything like that!

BizTalk maps are emitted as code components containing an executable XSLT resource. You can distribute maps as freely as you wish and invoke the tranforms via code. Obviously, direct invocation in this case assumes the use of either .NET or Mono, although Java/.NET bridges could be used. If you use BizTalk Server's mapping tools to create maps, you may end up with a dependency on BizTalk-specific scripted components invoked in the XSLT, which ties you to licensed BizTalk Boxes. However, it is pretty easy to avoid this if you wish.

One thing Sonic has which BizTalk really does not is dynamic management of code deployment into the run-time environment. BizTalk Server has an built-in code repository, but this is simply a mechanism for managing and storing compiled artifacts and resources for the purpose of exporting installation packages. You still have to manually install those packages or deploy them via additional script. Frankly, though, this is rarely a significant drawback. The types of solution built using BizTalk Server tend to warrant close attention to managing dynamic deployment across a distributed environment using other frameworks and tools, and BizTalk Server plays well with the relevant frameworks. There is even a community-built deployment framework specifically designed for BizTalk Server.

yt67 03/03/05 07:09:34 AM EST

Myth-busting: always entertaining.

Jason 03/02/05 09:16:29 AM EST

A good read!

Javier Camara 02/10/05 04:19:02 AM EST

(This same feedback also posted to another WSJ article about ESBs)

I agree in that the ESB concept is over-hyped. For me, a SOA makes sense if it is viewed as a constellation of web services interacting among them. For this, something like a UDDI server is required for each service locating each other.

For me, all this (i.e. services + directory) is just enough if only synchronous communications are used. If asynchronous communications are needed, then you need also publish/subscribe and store-and-forward, i.e. roughly what a MOM does. You can call it an ESB if you want, although I think this concept in the market encompasses several roles:
1. Publish/subscribe to messages
2. Store-and-forward messages
3. Route messages
4. Transform messages

An interesting thing to note is to implement points 1. and 2. you do *not* need business logic, while to implement 3. and 4. you do.

As I said, I see roles 1 and 2 required in SOAs with asynchronous interactions.

Roles 3 and 4 are also needed in many cases, mainly for integrating disparate systems. However, my main point against an ESB is that, in order to perform these roles, you do *NOT* need of a new, special concept like the ESB. *Any* service in the constellation of services can perform both routing and transformation. It can range from being a single component like an ESB (which I think is a bad idea), or it can just be a set of services (e.g. a different service performing specific adaptation for a system being integrated).

For me, using a single ESB for 3. and 4. breaks the beauty of the SOA idea. You are supposed to made all your data and business logic of your organization available as services in order to be reused, and suddenly you put on top an ESB in which you put *more* business logic (routing and transformation). So my point is that this should be implemented just by means of regular services, and not by specific, central-piece new components called ESBs.

Now, if for implementing routing and transformation you want to use Tibco, WebSphere or whatever, fine - however, the logic created by these products should be at the same level as the other services in the SOA, and not above.

So I am not saying that orchestrating tools are not useful. They are. Only, they are not *imprescindible*; and at any rate they should be viewed just as more services in the SOA. However, this does not fit the marketing strategy of ESB vendors which show its ESB as an *enabler* of a SOA, instead of just one more *component* of it.

Dave Chappell 02/03/05 09:54:43 PM EST

We (Sonic Software) didn't re-lable our product to support the ESB wave, we actually invented the concept. We then worked with the analyst and journalist community to help create industry awareness of the new concepts that are introduced by ESB, which has resulted in a whole new product category.

I would agree with you that there is a great deal of hype right now due to lack of understanding of what ESB is, which is compounded by the number of traditional middleware and EAI vendors who have clamoured to get ESB in their marketing literature without having a full understanding of what it means to have an ESB. Your comment about middleware with new clothes is well taken. You might get that impression depending on where you learned about what an ESB is. That is exactly what I am trying to point out with myth #1 in this article.

A certain amount of hype is expected when a technology category begins to take hold and gain traction within serious IT projects. This can be disruptive to the industry as a whole. This is also the primary reason why I wrote the OReilly book on the subject of ESB--to act as the definitive guide to help educate and provide clarity on what makes up an ESB. Please don't shoot the concept of ESB down until you have had a chance to understand it.

Larry 02/03/05 04:15:19 AM EST

Not surprising that the representative of a company who over-hyped ESB in the first place, and relabeled their own product ESB to catch the service wave, should now try to claim that anyone who saw through the hype is guilty of spreading myths.
ESB is just the middleware emporor's new clothes.

@MicroservicesExpo Stories
I recently attended and was a speaker at the 4th International Internet of @ThingsExpo at the Santa Clara Convention Center. I also had the opportunity to attend this event last year and I wrote a blog from that show talking about how the “Enterprise Impact of IoT” was a key theme of last year’s show. I was curious to see if the same theme would still resonate 365 days later and what, if any, changes I would see in the content presented.
You may have heard about the pets vs. cattle discussion – a reference to the way application servers are deployed in the cloud native world. If an application server goes down it can simply be dropped from the mix and a new server added in its place. The practice so far has mostly been applied to application deployments. Management software on the other hand is treated in a very special manner. Dedicated resources are set aside to run the management software components and several alerting syst...
Culture is the most important ingredient of DevOps. The challenge for most organizations is defining and communicating a vision of beneficial DevOps culture for their organizations, and then facilitating the changes needed to achieve that. Often this comes down to an ability to provide true leadership. As a CIO, are your direct reports IT managers or are they IT leaders? The hard truth is that many IT managers have risen through the ranks based on their technical skills, not their leadership ab...
It's been a busy time for tech's ongoing infatuation with containers. Amazon just announced EC2 Container Registry to simply container management. The new Azure container service taps into Microsoft's partnership with Docker and Mesosphere. You know when there's a standard for containers on the table there's money on the table, too. Everyone is talking containers because they reduce a ton of development-related challenges and make it much easier to move across production and testing environm...
Hiring the wrong candidate can cost a company hundreds of thousands of dollars, and result in lost profit and productivity during the search for a replacement. In fact, the Harvard Business Review has found that as much as 80 percent of turnover is caused by bad hiring decisions. But when your organization has implemented DevOps, the job is about more than just technical chops. It’s also about core behaviors: how they work with others, how they make decisions, and how those decisions translate t...
In his General Session at DevOps Summit, Asaf Yigal, Co-Founder & VP of Product at, explored the value of Kibana 4 for log analysis and provided a hands-on tutorial on how to set up Kibana 4 and get the most out of Apache log files. He examined three use cases: IT operations, business intelligence, and security and compliance. Asaf Yigal is co-founder and VP of Product at log analytics software company In the past, he was co-founder of social-trading platform Currensee, which...
People want to get going with DevOps or Continuous Delivery, but need a place to start. Others are already on their way, but need some validation of their choices. A few months ago, I published the first volume of DevOps and Continuous Delivery reference architectures which has now been viewed over 50,000 times on SlideShare (it's free to registration required). Three things helped people in the deck: (1) the reference architectures, (2) links to the sources for each architectur...
The Internet of Things (IoT) is growing rapidly by extending current technologies, products and networks. By 2020, Cisco estimates there will be 50 billion connected devices. Gartner has forecast revenues of over $300 billion, just to IoT suppliers. Now is the time to figure out how you’ll make money – not just create innovative products. With hundreds of new products and companies jumping into the IoT fray every month, there’s no shortage of innovation. Despite this, McKinsey/VisionMobile data...
Just over a week ago I received a long and loud sustained applause for a presentation I delivered at this year’s Cloud Expo in Santa Clara. I was extremely pleased with the turnout and had some very good conversations with many of the attendees. Over the next few days I had many more meaningful conversations and was not only happy with the results but also learned a few new things. Here is everything I learned in those three days distilled into three short points.
One of the most important tenets of digital transformation is that it’s customer-driven. In fact, the only reason technology is involved at all is because today’s customers demand technology-based interactions with the companies they do business with. It’s no surprise, therefore, that we at Intellyx agree with Patrick Maes, CTO, ANZ Bank, when he said, “the fundamental element in digital transformation is extreme customer centricity.” So true – but note the insightful twist that Maes adde...
DevOps is about increasing efficiency, but nothing is more inefficient than building the same application twice. However, this is a routine occurrence with enterprise applications that need both a rich desktop web interface and strong mobile support. With recent technological advances from Isomorphic Software and others, rich desktop and tuned mobile experiences can now be created with a single codebase – without compromising functionality, performance or usability. In his session at DevOps Su...
As organizations realize the scope of the Internet of Things, gaining key insights from Big Data, through the use of advanced analytics, becomes crucial. However, IoT also creates the need for petabyte scale storage of data from millions of devices. A new type of Storage is required which seamlessly integrates robust data analytics with massive scale. These storage systems will act as “smart systems” provide in-place analytics that speed discovery and enable businesses to quickly derive meaningf...
Using any programming framework to the fullest extent possible first requires an understanding of advanced software architecture concepts. While writing a little client-side JavaScript does not necessarily require as much consideration when designing a scalable software architecture, the evolution of tools like Node.js means that you could be facing large code bases that must be easy to maintain.
Continuous processes around the development and deployment of applications are both impacted by -- and a benefit to -- the Internet of Things trend. To help better understand the relationship between DevOps and a plethora of new end-devices and data please welcome Gary Gruver, consultant, author and a former IT executive who has led many large-scale IT transformation projects, and John Jeremiah, Technology Evangelist at Hewlett Packard Enterprise (HPE), on Twitter at @j_jeremiah. The discussion...
Discussions of cloud computing have evolved in recent years from a focus on specific types of cloud, to a world of hybrid cloud, and to a world dominated by the APIs that make today's multi-cloud environments and hybrid clouds possible. In this Power Panel at 17th Cloud Expo, moderated by Conference Chair Roger Strukhoff, panelists addressed the importance of customers being able to use the specific technologies they need, through environments and ecosystems that expose their APIs to make true ...
Microservices are a very exciting architectural approach that many organizations are looking to as a way to accelerate innovation. Microservices promise to allow teams to move away from monolithic "ball of mud" systems, but the reality is that, in the vast majority of organizations, different projects and technologies will continue to be developed at different speeds. How to handle the dependencies between these disparate systems with different iteration cycles? Consider the "canoncial problem"...
The Internet of Things is clearly many things: data collection and analytics, wearables, Smart Grids and Smart Cities, the Industrial Internet, and more. Cool platforms like Arduino, Raspberry Pi, Intel's Galileo and Edison, and a diverse world of sensors are making the IoT a great toy box for developers in all these areas. In this Power Panel at @ThingsExpo, moderated by Conference Chair Roger Strukhoff, panelists discussed what things are the most important, which will have the most profound...
PubNub has announced the release of BLOCKS, a set of customizable microservices that give developers a simple way to add code and deploy features for realtime apps.PubNub BLOCKS executes business logic directly on the data streaming through PubNub’s network without splitting it off to an intermediary server controlled by the customer. This revolutionary approach streamlines app development, reduces endpoint-to-endpoint latency, and allows apps to better leverage the enormous scalability of PubNu...
Growth hacking is common for startups to make unheard-of progress in building their business. Career Hacks can help Geek Girls and those who support them (yes, that's you too, Dad!) to excel in this typically male-dominated world. Get ready to learn the facts: Is there a bias against women in the tech / developer communities? Why are women 50% of the workforce, but hold only 24% of the STEM or IT positions? Some beginnings of what to do about it! In her Day 2 Keynote at 17th Cloud Expo, San...
In today's enterprise, digital transformation represents organizational change even more so than technology change, as customer preferences and behavior drive end-to-end transformation across lines of business as well as IT. To capitalize on the ubiquitous disruption driving this transformation, companies must be able to innovate at an increasingly rapid pace. Traditional approaches for driving innovation are now woefully inadequate for keeping up with the breadth of disruption and change facin...