From the Blogosphere
Microservices Unplugged | @DevOpsSummit #IoT #DevOps #CD #Microservices
Newman advises that we should think of microservices as a specific approach for SOA
By: David Sprott
Jan. 30, 2017 02:00 PM
Given my (well-known and enduring) interest in all aspects of services, I have followed Martin Fowler's writing on microservices. But I will admit I always found the original paper more confusing than insightful. And in my client work I have resisted the temptation to use a microservices pattern, for precisely the reason that it would more than likely confuse. So I was interested to see the book Building Microservices by Sam Newman published last month, particularly as Newman is part of the Thoughtworks stable, which presumably means it is authoritative.
Right off the bat, Newman advises that we should "think of microservices as a specific approach for SOA in the same way that XP or Scrum are specific approaches for Agile Software development". These analogies are very interesting because my expectation was that microservices is a pattern. So I might infer that microservices is a set of process techniques as opposed to an architectural approach. Yet in the book, Newman clearly includes some elements of concept model and architecture as well as process and organization.
Probably the biggest weakness of Newman's book is the absence of a coherent reference model. He discusses a series of heuristics such as:
- Microservices are small, autonomous services that work together.
- With high cohesion.
- Gather those things that change for the same reason, and separate those things that change for different reasons.
- Using business boundaries.
- How small is small? Could be written in 2 weeks; small enough and no smaller; can be managed by a small team
- Separate entity. All communications between services are network calls. Decoupled. Minimum dependency.
- We need to think about what our services expose, and what they should allow to be hidden. If there is too much sharing our consuming services become coupled to internal representations.
And these are mostly useful principles, but are most unlikely to guide a consistent approach. Given Martin Fowler's involvement, I would have expected at least some good patterns. But mature SOA needs a defined concept model, like CBDI-SAE, SOA-RM etc.
This lack of clarity is fundamental. Many organizations treat operations as services, and they typically end up with thousands of services. They will be confused by the very term microservice because they already have what they perceive as small services. Perhaps the term microservice has been chosen because of the ubiquitous use of the ITIL service, which undoubtedly means monolith. Most mature SOA organizations define services and operations as a primary technique to establish cohesion guided by reference models such as SOA-RM and CBDI-SAE. Just as important is the clarity and precision around specifications or contracts and what is exposed to consumers (APIs) and providers. Yet the book contains nothing on the subject of rich service specification or contract as the primary means of achieving implementation independence and business alignment. Organizations adopting microservices will need a defined reference model. Without that there will be architecture governance by personal opinion. I wonder how Thoughtworks advise their clients in this area?
The book contains some quite general advice on business capability based decomposition - which is a tried and tested method of defining services. However there is little or no advice on what a well-formed business capability is, it's characteristics and governance considerations. In my experience this is an area for considerable confusion; the business capability concept is so well known, but little understood, it's an accident waiting to happen. And as for the relationship between capability and service, there's no model provided, and more importantly, the granularity of a business capability service is likely to be non-trivial.
Similarly there's no guidance on types of service. Do all services contain a mix of channel, process, business and data behaviors? Which you might expect given the explicit advice to gather those things that change for the same reason, and separate those things that change for different reasons.
The one area that might be helpful is the concept that microservices are highly autonomous, and a capability cluster of services would be a unit of deployment. But sadly for Newman, this is an idea that I and my colleagues worked on and popularized nearly 20 years ago. We called it Component Based Development, and the concept was closely allied to Rich Service Specifications which enforced the component boundaries, a concept that seems to have escaped him.
Once upon a time I had expected there to be a microservice pattern. But having read the book, all I see is a set of established ideas being rehashed in a very superficial manner, under a new name; with many key concepts missing or misunderstood. Apparently there is a lack of consensus on how to do SOA well. That failure of SOA is caused by vendors’ products, issues with granularity or picking wrong places to split a system. These assessments of the problem illustrate the lack of understanding of the author and his colleagues. Yes, there have been SOA failures, but mostly they have arisen through a) a focus on integration technology not business, or b) lack of reference model, reference architecture and governance. As an aside, in mature SOA we don’t consider “places to split a system”; we define the scope of a service using well defined heuristics and techniques that vary by type of service. To claim therefore that microservices is the answer to problems with SOA is downright disingenuous. And given the amount of hype I see about the topic generated by supposedly responsible organizations such as Thoughtworks and Gartner, that’s downright irresponsible. Disappointing.
Public Domain information on Mature SOA architecture and delivery practices
Book reference: Building Microservices by Sam Newman
@DevOpsSummit at Cloud Expo taking place June 6-8, 2017, at Javits Center, New York City, and is co-located with the 20th International Cloud Expo and will feature technical sessions from a rock star conference faculty and the leading industry players in the world.
DevOps at Cloud Expo / @ThingsExpo 2017 New York
DevOps at Cloud Expo / @ThingsExpo 2017 Silicon Valley
Download Show Prospectus ▸ Here
The widespread success of cloud computing is driving the DevOps revolution in enterprise IT. Now as never before, development teams must communicate and collaborate in a dynamic, 24/7/365 environment. There is no time to wait for long development cycles that produce software that is obsolete at launch. DevOps may be disruptive, but it is essential.
@DevOpsSummit will expand the DevOps community, enable a wide sharing of knowledge, and educate delegates and technology providers alike. Recent research has shown that DevOps dramatically reduces development time, the amount of enterprise IT professionals put out fires, and support time generally. Time spent on infrastructure development is significantly increased, and DevOps practitioners report more software releases and higher quality. Sponsors of @DevOpsSummit will benefit from unmatched branding, profile building and lead generation opportunities through:
For more information on sponsorship, exhibit, and keynote opportunities, contact Carmen Gonzalez by email at events (at) sys-con.com, or by phone 201 802-3021.
The World's Largest "Cloud Digital Transformation" Event
@CloudExpo / @ThingsExpo 2017 New York
@CloudExpo / @ThingsExpo 2017 Silicon Valley
Full Conference Registration Gold Pass and Exhibit Hall ▸ Here
Register For @CloudExpo ▸ Here via EventBrite
Register For @ThingsExpo ▸ Here via EventBrite
Register For @DevOpsSummit ▸ Here via EventBrite
Sponsors of Cloud Expo / @ThingsExpo will benefit from unmatched branding, profile building and lead generation opportunities through:
For more information on sponsorship, exhibit, and keynote opportunities, contact Carmen Gonzalez (@GonzalezCarmen) today by email at events (at) sys-con.com, or by phone 201 802-3021.
All major researchers estimate there will be tens of billions devices - computers, smartphones, tablets, and sensors - connected to the Internet by 2020. This number will continue to grow at a rapid pace for the next several decades.
With major technology companies and startups seriously embracing Cloud strategies, now is the perfect time to attend @CloudExpo | @ThingsExpo, June 6-8, 2017, at the Javits Center in New York City, NY and October 31 - November 2, 2017, Santa Clara Convention Center, CA. Learn what is going on, contribute to the discussions, and ensure that your enterprise is on the right path to Digital Transformation.
Track 1. FinTech
Delegates to Cloud Expo / @ThingsExpo will be able to attend 8 simultaneous, information-packed education tracks.
There are over 120 breakout sessions in all, with Keynotes, General Sessions, and Power Panels adding to three days of incredibly rich presentations and content.
Join Cloud Expo / @ThingsExpo conference chair Roger Strukhoff (@IoT2040), June 6-8, 2017, at the Javits Center in New York City, NY and October 31 - November 2, 2017, Santa Clara Convention Center, CA for three days of intense Enterprise Cloud and 'Digital Transformation' discussion and focus, including Big Data's indispensable role in IoT, Smart Grids and (IIoT) Industrial Internet of Things, Wearables and Consumer IoT, as well as (new) Digital Transformation in Vertical Markets.
Financial Technology - or FinTech - Is Now Part of the @CloudExpo Program!
Accordingly, attendees at the upcoming 20th Cloud Expo / @ThingsExpo June 6-8, 2017, at the Javits Center in New York City, NY and October 31 - November 2, 2017, Santa Clara Convention Center, CA will find fresh new content in a new track called FinTech, which will incorporate machine learning, artificial intelligence, deep learning, and blockchain into one track.
Financial enterprises in New York City, London, Singapore, and other world financial capitals are embracing a new generation of smart, automated FinTech that eliminates many cumbersome, slow, and expensive intermediate processes from their businesses.
FinTech brings efficiency as well as the ability to deliver new services and a much improved customer experience throughout the global financial services industry. FinTech is a natural fit with cloud computing, as new services are quickly developed, deployed, and scaled on public, private, and hybrid clouds.
More than US$20 billion in venture capital is being invested in FinTech this year. @CloudExpo is pleased to bring you the latest FinTech developments as an integral part of our program, starting at the 20th International Cloud Expo June 6-8, 2017 in New York City and October 31 - November 2, 2017 in Silicon Valley.
The upcoming 20th International @CloudExpo | @ThingsExpo, June 6-8, 2017, at the Javits Center in New York City, NY and October 31 - November 2, 2017, Santa Clara Convention Center, CA announces that its Call For Papers for speaking opportunities is open.
Submit your speaking proposal today! ▸ Here
Our Top 100 Sponsors and the Leading "Digital Transformation" Companies
(ISC)2, 24Notion (Bronze Sponsor), 910Telecom, Accelertite (Gold Sponsor), Addteq, Adobe (Bronze Sponsor), Aeroybyte, Alert Logic, Anexia, AppNeta, Avere Systems, BMC Software (Silver Sponsor), Bsquare Corporation (Silver Sponsor), BZ Media (Media Sponsor), Catchpoint Systems (Silver Sponsor), CDS Global Cloud, Cemware, Chetu Inc., China Unicom, Cloud Raxak, CloudBerry (Media Sponsor), Cloudbric, Coalfire Systems, CollabNet, Inc. (Silver Sponsor), Column Technologies, Commvault (Bronze Sponsor), Connect2.me, ContentMX (Bronze Sponsor), CrowdReviews (Media Sponsor) CyberTrend (Media Sponsor), DataCenterDynamics (Media Sponsor), Delaplex, DICE (Bronze Sponsor), EastBanc Technologies, eCube Systems, Embotics, Enzu Inc., Ericsson (Gold Sponsor), FalconStor, Formation Data Systems, Fusion, Hanu Software, HGST, Inc. (Bronze Sponsor), Hitrons Solutions, IBM BlueBox, IBM Bluemix, IBM Cloud (Platinum Sponsor), IBM Cloud Data Services/Cloudant (Platinum Sponsor), IBM DevOps (Platinum Sponsor), iDevices, Industrial Internet of Things Consortium (Association Sponsor), Impinger Technologies, Interface Masters, Intel (Keynote Sponsor), Interoute (Bronze Sponsor), IQP Corporation, Isomorphic Software, Japan IoT Consortium, Kintone Corporation (Bronze Sponsor), LeaseWeb USA, LinearHub, MangoApps, MathFreeOn, Men & Mice, MobiDev, New Relic, Inc. (Bronze Sponsor), New York Times, Niagara Networks, Numerex, NVIDIA Corporation (AI Session Sponsor), Object Management Group (Association Sponsor), On The Avenue Marketing, Oracle MySQL, Peak10, Inc., Penta Security, Plasma Corporation, Pulzze Systems, Pythian (Bronze Sponsor), Cosmos, RackN, ReadyTalk (Silver Sponsor), Roma Software, Roundee.io, Secure Channels Inc., SD Times (Media Sponsor), SoftLayer (Platinum Sponsor), SoftNet Solutions, Solinea Inc., SpeedyCloud, SSLGURU LLC, StarNet, Stratoscale, Streamliner, SuperAdmins, TechTarget (Media Sponsor), TelecomReseller (Media Sponsor), Tintri (Welcome Reception Sponsor), TMCnet (Media Sponsor), Transparent Cloud Computing Consortium, Veeam, Venafi, Violin Memory, VAI Software, Zerto
About SYS-CON Media & Events
Cloud Expo®, Big Data Expo® and @ThingsExpo® are registered trademarks of Cloud Expo, Inc., a SYS-CON Events company.
SOA World Latest Stories
Subscribe to the World's Most Powerful Newsletters
Subscribe to Our Rss Feeds & Get Your SYS-CON News Live!
SYS-CON Featured Whitepapers
Most Read This Week