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Reference Architecture for #Microservices | @CloudExpo #Serverless #DevOps
The goal of microservices is to improve software delivery speed and increase system safety as scale increases

The goal of Microservices is to improve software delivery speed and increase system safety as scale increases. Microservices being modular these are faster to change and enables an evolutionary architecture where systems can change, as the business needs change. Microservices can scale elastically and by being service oriented can enable APIs natively. Microservices also reduce implementation and release cycle time and enables continuous delivery. This paper provides a logical overview of the Microservices Reference Architecture that highlights various sub systems needed to support Microservices deployment and execution.

Introduction
Switch over to Microservices is an hour of need in web application development and delivery and is crucial for the success of Enterprises today.

Of late, enterprises are adopting technologies like analytics, mobility, social media, IoT and smart embedded devices to change customer relationships, internal processes and value propositions. Microservices acts like a bridge between these technologies and provides the building blocks for developing modern distributed enterprise systems to become one of the enablers in the digital transformation journey of the enterprise.

Adoption of Microservices provides the agility, reliability, maintainability, scalability and deploy ability to the enterprises as part of digital transformation process.

There exists many different architecture definition approaches for implementing Microservices across Industry. Many of them are unique and specific to the needs of individual development teams. Many enterprises, without understanding or highlighting the name, have been using an approach towards leveraging APIs that classified as Microservices. This demands a need for designing Reference Architecture to develop and deliver Microservices‑based applications that consumed across the Enterprises.

There exists, numerous articles and blogs on Microservices reference architecture, architecture principles and best practices. This paper summarizes the purpose of Microservices Reference Architecture, drivers for adopting Microservices, Microservices architecture principles and logical view of Microservices Reference Architecture.

Drivers for Microservice Reference Architecture
Microservices are smaller in scope, determined by a focus on domain boundaries and consistent domain modelling, and require less code. In addition, in Monolithic applications, the application components communicate in memory. In the case of Microservices based applications, the communication happens over the network. This leads to software development and deployment becomes more reliable and faster.

With Microservices, each service can scale independently to meet temporary traffic, complete batch processing and other business needs. Improved fault isolation restricts service issues, such as memory leaks or open database connections. The scalability of Microservices complements the flexibility of cloud services improves service and handle more customers simultaneously without interrupting service.

The following diagram represents few key drivers for Enterprises adopting Microservices.

Microservices Architecture Principles
Below are few key architectural principles for Microservices:

Single Responsibility Principle: Each microservice must be responsible for a specific feature or a business functionality or aggregation of cohesive functionality completely.

Granular: Microservice granularity is contained within the intersection of a single functional domain, a single data domain and its immediate dependencies, a self-sufficient packaging and a technology domain.

Domain Driven Design: Domain driven design is an architectural principle in-line with object-oriented approach. It considers the business domain, elements and behaviors and interactions between business domains.

Encapsulation: Each Microservice encapsulates the internal implementation details, so that the external system utilizes the services need not worry about the internals. Encapsulation reduces the complexity and enhances the flexibility of the system.

Loose Coupling: There must be zero coordination necessary for the deployment with other Microservices. The changes in one microsystem should have zero or minimum impact on other services in the eco-system.  

Separation of Concerns: Develop the microservices based on distinct features with zero overlap with other functions. The main objective is to reduce the interaction between services so that they are highly cohesive and loosely coupled. If we separate, the functionality across wrong boundaries will lead tight coupling and increased complexity between services.

Language Neutral: Microservices are composed together to form a complex application, and they do not need to be written using the same programming language. For example, Java might be the correct language for one application, and in others, it might be Python etc.

Hexagonal Architecture: Microservice exposes RESTful APIs for external communication, message broker interface for event notification and database adapters for persistence. This makes hexagonal architecture as a most suitable style for Microservice development.

Sizing of Microservices
It is important that, while designing a Microservice, there is a need to decide on the number and size of individual Microservices. There is no strict rule regarding the optimal size of the Microservice and it depends on the partitioning of the problem space if it is a new development application or splitting the existing monolithic application into individual Microservices.

Also, Microservices cannot be too large or too small. Large services are hard to work with, hard to deploy, and take longer to start and stop. On the other side, when Microservices are too small, the resource cost of deploying and operating such a service overshadows its utility.

Microservice granularity can also be determined based on business needs. Making services too granular, or requiring too many dependencies on other Microservices, can introduce latency.

Microservices allow teams to plan, develop, and deploy features of a system in the cloud without tight coordination. It is therefore, Microservice number and size be dictated by business and technical principles.

Microservices Reference Architecture
Microservices is an architecture style, in which software systems or applications are composed of one or more independent and self-contained services. It is not a product, framework, or platform. It is a strategy for building large distributed systems and are loosely coupled and deployed independently of one another.

The following guidelines to be adapted while designing the services of Microservices Reference Architecture.

  • Lightweight: To facilitate smaller memory footprints and faster start up times
  • Reactive: Applicable for services with concurrent loads or longer response times
  • Stateless: Services scale better and start faster as there is no state to be passivated on shutdown or activated on start up
  • Atomic: helps to do the smallest business unit of work that can be done independently
  • Externalized Configuration: externalize the configurations in the config server, so that it can be maintained in hierarchical structure per environment
  • Consistent: Services should be written in a consistent style as per the coding standards and naming convention guidelines
  • Resilient: Service should handle exceptions arising from technical reasons (connectivity, runtime), and business reasons (invalid inputs) and not crash
  • Reporting: Usage statistics, number of times accessed, average response time, etc. via JMX API
  • Versioned: Support multiple versions for different clients, till all clients migrate to higher versions

Below is the logical view of the Microservices reference architecture.

Fig 2: Microservices Reference Architecture - Logical View

Various components of the reference architecture are described below:

Channels: Channels represents various client side or consumer applications, which will interact with Microservices.

Edge Server: API services or edge services reside on edge server or the API Gateway. Channels interact with the edge services, which decouples the microservices, and keep them channel agnostic.

API gateway is the single entry point for all clients. API Gateway is responsible for aggregating data or, in some cases, acting as a simple routing layer for appropriate services. The API gateway act as a single point of failure. For the coordination between cloud and on premise communication, an API Gateway is used.

The following diagram shows the API gateway interaction patterns

Load Balancer
It is a software based load balancer used for communication between Microservices. Configured for each service for availability, scalability and reliability.

Below diagram show load-balancing scheme.

Decentralized load balancing is the appropriate mechanism for distributing requests between available Microservice instances. Each Microservice can have its own load balancer handling only requests for that Microservice. Client is directly responsible for routing requests to an available Microservice.

API Service: API services need to be exposed either on the edge server or on API Gateway. The Service expose client specific API and can also act as coarse-grained services to orchestrate across multiple Microservices within or across bounded contexts. These services can interact with composite Microservices or directly with core Micro services.

API services can also communicate with the Enterprise Integration Infrastructure (typically ESB/MOM) to access any on premise Enterprise Applications

Composite Service: Composite services orchestrate across multiple core services. These services shall be communicating with the other services using the event-sourcing model or orchestration.

Core services: These services are the basic building blocks for Microservices architecture. These services encapsulate an entity or an aggregate (fine grained) within a given bounded context. Best practice is that, the granularity of the Microservices are always fine grained.

Circuit Breaker: Fault tolerance will ensure that when there is failure, the failed services does not adversely affect the entire system. Without proper mechanisms in place, errors, latencies will trickle up to the calling clients where they will potentially exhaust limited resources. When cascading failures occur, the overall system availability is significantly affected.

The three states of the Circuit Breaker is depicted below,

Closed State
When the service dependency is healthy and no issues detected, the Circuit Breaker is in state of closed. All invocations can pass through the service.

Open State
Circuit Breaker considers the following invocations as failed and factors them in deciding circuit open:

  • Request to the remote service time out
  • Thread pool and bounded task queue used to interact with Service dependency are at 100% capacity
  • Client library used to interact with a service dependency throws an exception

In open state, the circuit breaker reject invocations by either

  • Throwing an exception
  • Returning a fallback output

Half Open State
When the circuit breaker is in Open state, it periodically leaves through one invocation at a configurable interval. If the invocation succeeds, the circuit is closed again.

Cloud Config: It is a single source of configuration data for all other services in a Microservice-based application. Each service can have its configuration in a repository, which centralizes the configuration across all environments. It decouples the configuration from the implementation, which helps to update the configuration without affecting any of the services. Every update on the configuration files in the repository are automatically propagated to the running instances.

Service Discovery: In Microservices application, the dynamic assignment of service instances network locations happens automatically. In addition, the set of service instances changes dynamically because of auto-scaling, failures and upgrades. Consequently, the client code needs to use a service discovery mechanism.

There are two main service discovery patterns: Client-side discovery and Server-side discovery.

  • Client-Side Discovery Pattern: Client is responsible for determining the network locations of available service instances and load balancing requests across them. The client queries a service registry, which is a database of available service instances. The client then uses a load-balancing algorithm to select one of the available service instances and makes a request.
  • Server-Side Discovery Pattern: Client makes the request to a service via a load balancer. The load balancer queries the service registry and routes each request to an available service instance.
  • Service Registry: Service registry is a key part of service discovery. It is a database containing the network locations of service instances. A service registry needs to be highly available and up to date. Clients can cache network locations obtained from the service registry. However, that information eventually becomes out of date and clients become unable to discover service instances.
  • Self-Registration Pattern: Service instance is responsible for registering and deregistering itself with the service registry. In addition, a service instance sends heartbeat requests to prevent its registration from expiring.
  • Third-Party Registration Pattern: In this case, another system component known as the service registrar handles the registration. The service registrar tracks changes to the set of running instances by either polling the deployment environment or subscribing to events. It registers and deregisters the service instances.

Messaging & Events Stream: Lightweight messaging platforms like AMQP shall be used for exchange of messages between microservice within or across bounded contexts or in case of event sourcing used as part of the choreography.

Monitoring: As microservices are distributed and heterogeneous in nature, it is critical to monitor and visualize making sure that software is reliable, available, and performs as expected. Monitoring typically involves collecting metrics from all the applicable systems involved and analyzing/visualizing call graphs. These gets complex as the application complexity (again depends on number microservices and their interactions in a call graph) grows. There are many commercial and open source tools for monitoring microservices.

Distributed Tracing: Distributed tracing helps in how a request traverse through the application, especially when you may not have any insight into the implementation of the microservice you are calling. Tracing tools introduces unique IDs for logging which are consistent between Microservice calls which makes possible to find how a single request travels from one Microservice to the next.

Security: With microservices, security becomes a challenge primarily because no middleware component handles security-based functionality. Instead, each service must handle security on its own, or in some cases, the API layer be made more intelligent to handle the security aspects of the application. Security Frameworks like oAuth2 address the security concern. There are multiple ways of configuring security for microservices; by making API Gateway behave like reverse proxy or by securing each microservice using the security service (backing service like IAM) provided by the PaaS provider.

Backing Services: A PaaS provides services grouped into various categories like database, analytics, security, Data warehouse etc. used by the cloud application. These services expose lightweight protocols (like REST) and consumed by the cloud application by binding. PaaS providers provide consoles (UI based) to manage backing services.

On Premise Integration: API Gateway helps to mediate the communication between cloud and on premise applications. API Services will be used to orchestrate calls that span cloud and on premise by calling the enterprise integration infrastructure for calling any applications on premise.

Infrastructure: Infrastructure has two components; PaaS and IaaS. IaaS is the abstraction onto the hardware and provides on demand resource provisioning. Resources can be scaled out or in based on usage pattern. PaaS is cloud platform residing on top of IaaS. This layer provide the required support for the cloud applications to deploy and run. PaaS provides various runtimes and many backing services required for a cloud application.

Conclusions
Microservices is not a product, framework, or platform. It is a strategy for building large enterprise distributed systems. One of the characteristic of microservice is of loosely coupled and deployed independently of one another. Microservices architecture can offer enterprises many advantages, from independent scalability of diverse application components to faster, easier software development and maintenance. Sizing of the Microservices is very critical for the design of the better services. Open source technology solutions and organizational methods are leading the Microservices market. As a result, Microservices reduce vendor lock-in and eliminate long-term technology commitment, helps to choose the tools need to meet IT and business goals.

In addition, Microservices Reference Architecture need to be developed based on industry‑standard components like Docker containers, and a wide range of languages - Java, PHP, Python, Node.js/JavaScript and Ruby etc. Developed Microservice must expose JavaScript Object Notation (JSON) or Extensible Mark up Language (XML) over the HTTP to provide a REST API. These standards would provide guidelines about how to describe, maintain, and retire Microservices.

Finally, Microservices based System Design is an ongoing story. It is not something that has to done once, and immediately. With the right people, processes, and tools, Microservices can deliver faster development and deployment, easier maintenance, improved scalability, and freedom from long-term technology commitment.

References

  1. "Microservices". martinfowler.com. Retrieved 2017-02-06
  2. S. Newman, Building Microservices - Designing Fine-Grained Systems, O'Reilly, 2015
  3. E. Wolff, Microservices: Flexible Software Architecture, Addison-Wesley, 2016

Acknowledgements

The authors would like to thank Hari Kishan Burle, Raju Alluri of Global Enterprise Architecture

Group of Wipro Technologies for giving the required time and support in many ways in bringing

Up the article as part of Global Enterprise Architecture Practice efforts.

Authors

Dr. Gopala Krishna Behara is a Lead Enterprise Architect in the SCA Practice division of Wipro. He has a total of 21 years of IT experience. Reached at [email protected]

Tirumala Khandrika is a Senior Architect in the SCA Practice division of Wipro. He has a total of 16 years of IT experience. Reached at [email protected]

Sridhar Chalasani is an Architect in the SCA Practice division of Wipro. He has a total of 12 years of IT experience. Reached at [email protected]

Disclaimer

The views expressed in this article/presentation are that of authors and Wipro does not subscribe to the substance, veracity or truthfulness of the said opinion.


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About Gopala Krishna Behara
Dr. Gopala Krishna Behara is a Senior Enterprise Architect in the Enterprise Architecture & Solutions division of Wipro. He has a total of 16 years of IT experience. He can be reached at [email protected]

About Sridhar Chalasani
Sridhar Chalasani is an Architect in the Global Enterprise Architecture Practice division of Wipro. He has a total of 12 years of IT experience. He can be reached at [email protected]

About Tirumala Khandrika
Tirumala Khandrika is a Senior Architect in the Global Enterprise Architecture Practice division of Wipro. He has a total of 16 years of IT experience. He can be reached at tir[email protected]

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Despite being the market leader, we recognized the need to transform and reinvent our business at Dynatrace, before someone else disrupted the market. Over the course of three years, we changed everything - our technology, our culture and our brand image. In this session we'll discuss how we navigated through our own innovator's dilemma, and share takeaways from our experience that you can apply to your own organization.
Best Recent Articles on Cloud Computing & Big Data Topics
As we enter a new year, it is time to look back over the past year and resolve to improve upon it. In 2014, we will see more service providers resolve to add more personalization in enterprise technology. Below are seven predictions about what will drive this trend toward personalization.
IT organizations face a growing demand for faster innovation and new applications to support emerging opportunities in social, mobile, growth markets, Big Data analytics, mergers and acquisitions, strategic partnerships, and more. This is great news because it shows that IT continues to be a key stakeholder in delivering business service innovation. However, it also means that IT must deliver new innovation despite flat budgets, while maintaining existing services that grow more complex every day.
Cloud computing is transforming the way businesses think about and leverage technology. As a result, the general understanding of cloud computing has come a long way in a short time. However, there are still many misconceptions about what cloud computing is and what it can do for businesses that adopt this game-changing computing model. In this exclusive Q&A with Cloud Expo Conference Chair Jeremy Geelan, Rex Wang, Vice President of Product Marketing at Oracle, discusses and dispels some of the common myths about cloud computing that still exist today.
Despite the economy, cloud computing is doing well. Gartner estimates the cloud market will double by 2016 to $206 billion. The time for dabbling in the cloud is over! The 14th International Cloud Expo, co-located with 5th International Big Data Expo and 3rd International SDN Expo, to be held June 10-12, 2014, at the Javits Center in New York City, N.Y. announces that its Call for Papers is now open. Topics include all aspects of providing or using massively scalable IT-related capabilities as a service using Internet technologies (see suggested topics below). Cloud computing helps IT cut infrastructure costs while adding new features and services to grow core businesses. Clouds can help grow margins as costs are cut back but service offerings are expanded. Help plant your flag in the fast-expanding business opportunity that is The Cloud, Big Data and Software-Defined Networking: submit your speaking proposal today!
What do you get when you combine Big Data technologies….like Pig and Hive? A flying pig? No, you get a “Logical Data Warehouse.” In 2012, Infochimps (now CSC) leveraged its early use of stream processing, NoSQLs, and Hadoop to create a design pattern which combined real-time, ad-hoc, and batch analytics. This concept of combining the best-in-breed Big Data technologies will continue to advance across the industry until the entire legacy (and proprietary) data infrastructure stack will be replaced with a new (and open) one.
While unprecedented technological advances have been made in healthcare in areas such as genomics, digital imaging and Health Information Systems, access to this information has been not been easy for both the healthcare provider and the patient themselves. Regulatory compliance and controls, information lock-in in proprietary Electronic Health Record systems and security concerns have made it difficult to share data across health care providers.
Cloud Expo, Inc. has announced today that Vanessa Alvarez has been named conference chair of Cloud Expo® 2014. 14th International Cloud Expo will take place on June 10-12, 2014, at the Javits Center in New York City, New York, and 15th International Cloud Expo® will take place on November 4-6, 2014, at the Santa Clara Convention Center in Santa Clara, CA.
12th International Cloud Expo, held on June 10–13, 2013 at the Javits Center in New York City, featured four content-packed days with a rich array of sessions about the business and technical value of cloud computing led by exceptional speakers from every sector of the cloud computing ecosystem. The Cloud Expo series is the fastest-growing Enterprise IT event in the past 10 years, devoted to every aspect of delivering massively scalable enterprise IT as a service.
Ulitzer.com announced "the World's 30 most influential Cloud bloggers," who collectively generated more than 24 million Ulitzer page views. Ulitzer's annual "most influential Cloud bloggers" list was announced at Cloud Expo, which drew more delegates than all other Cloud-related events put together worldwide. "The world's 50 most influential Cloud bloggers 2010" list will be announced at the Cloud Expo 2010 East, which will take place April 19-21, 2010, at the Jacob Javitz Convention Center, in New York City, with more than 5,000 expected to attend.
It's a simple fact that the better sales reps understand their prospects' intentions, preferences and pain points during calls, the more business they'll close. Each day, as your prospects interact with websites and social media platforms, their behavioral data profile is expanding. It's now possible to gain unprecedented insight into prospects' content preferences, product needs and budget. We hear a lot about how valuable Big Data is to sales and marketing teams. But data itself is only valuable when it's part of a bigger story, made visible in the right context.
Cloud Expo, Inc. has announced today that Larry Carvalho has been named Tech Chair of Cloud Expo® 2014. 14th International Cloud Expo will take place on June 10-12, 2014, at the Javits Center in New York City, New York, and 15th International Cloud Expo® will take place on November 4-6, 2014, at the Santa Clara Convention Center in Santa Clara, CA.
Everyone talks about a cloud-first or mobile-first strategy. It's the trend du jour, and for good reason as these innovative technologies have revolutionized an industry and made savvy companies a lot of money. But consider for a minute what's emerging with the Age of Context and the Internet of Things. Devices, interfaces, everyday objects are becoming endowed with computing smarts. This is creating an unprecedented focus on the Application Programming Interface (API) as developers seek to connect these devices and interfaces to create new supporting services and hybrids. I call this trend the move toward an API-first business model and strategy.
We live in a world that requires us to compete on our differential use of time and information, yet only a fraction of information workers today have access to the analytical capabilities they need to make better decisions. Now, with the advent of a new generation of embedded business intelligence (BI) platforms, cloud developers are disrupting the world of analytics. They are using these new BI platforms to inject more intelligence into the applications business people use every day. As a result, data-driven decision-making is finally on track to become the rule, not the exception.
Testimonials
This week I had the pleasure of delivering the opening keynote at Cloud Expo New York. It was amazing to be back in the great city of New York with thousands of cloud enthusiasts eager to learn about the next step on their journey to embracing a cloud-first worldl."
@SteveMar_Msft
 
How does Cloud Expo do it every year? Another INCREDIBLE show - our heads are spinning - so fun and informative."
@SOASoftwareInc
 
Thank you @ThingsExpo for such a great event. All of the people we met over the past three days makes us confident IoT has a bright future."
@Cnnct2me
 
One of the best conferences we have attended in a while. Great job, Cloud Expo team! Keep it going."

@Flexential


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Digital Transformation Blogs
Digital Transformation (DX) is a major focus with the introduction of DXWorldEXPO within the program. Successful transformation requires a laser focus on being data-driven and on using all the tools available that enable transformation if they plan to survive over the long term. A total of 88% of Fortune 500 companies from a generation ago are now out of business. Only 12% still survive. Similar percentages are found throughout enterprises of all sizes. We are offering early bird savings on all ticket types where you can save significant amount of money by purchasing your conference ti...
SAP is the world leader in enterprise applications in terms of software and software-related service revenue. Based on market capitalization, we are the world's third largest independent software manufacturer. Harness the power of your data and accelerate trusted outcome-driven innovation by developing intelligent and live solutions for real-time decisions and actions on a single data copy. Support next-generation transactional and analytical processing with a broad set of advanced analytics - run securely across hybrid and multicloud environments.
Cloud-enabled transformation has evolved from cost saving measure to business innovation strategy -- one that combines the cloud with cognitive capabilities to drive market disruption. Learn how you can achieve the insight and agility you need to gain a competitive advantage. Industry-acclaimed CTO and cloud expert, Shankar Kalyana presents. Only the most exceptional IBMers are appointed with the rare distinction of IBM Fellow, the highest technical honor in the company. Shankar has also received the prestigious Outstanding Technical Achievement Award three times - an accomplishment befitting ...