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By weighing the pros & cons of the different software architectures you’ll be able to choose the right one for your organization

Microservices, Monoliths, and Self-Contained Systems: Time to Break It Down
By Josh Symonds

Is your application too difficult to manage? Do changes take dozens of developers hundreds of hours to execute, and frequently result in downtime across all your site’s functions? It sounds like you have a monolith! A monolith is one of the three main software architectures that define most applications. Whether you’ve intentionally set out to create a monolith or not, it’s worth at least weighing the pros and cons of the different architectural approaches and deciding which one makes the most sense for your applications. The proper design pattern can save your organization time and money, and can make your engineers a whole lot happier. But how will you know which is right for you? Read on to figure out if a monolith, microservices, or self-contained system makes the most sense for your development team.

Monoliths
Let’s start by discussing monoliths. A monolith is the “default” software architecture. If you didn’t set out with a plan before you started coding, you probably created a monolith. As the name implies, this style of application is one big codebase: All functions and features of your application are together, frequently dependent on each other, and split among dozens or hundreds of different files. Though it’s the oldest architecture, there are clear advantages to monoliths, which is why many very successful organizations stick with them. Unfortunately, there are also a lot of drawbacks.

Pros

  • Initial development is fast
    It’s relatively easy to add new features and functionality to a monolith because there’s no question about where anything should go—the answer is inside the monolith. Easy!
  • There’s less complication around crosscutting concerns
    If you have a workflow that touches every part of your application—like charging user credit cards and generating shipping labels—a monolith makes implementing it extremely simple. All your data is right there and you can act on it immediately. Compare this to complicated message passing, queuing strategies, and trying to find canonical sources of truth, and you can see why monoliths are so enticing.
  • All concerns only need to be addressed once
    Do you need to set up logging, rate limiting, or security features for your application? Luckily for you, with monoliths you only have to do it once. When it’s done the first time, it’s done for good.

Cons

  • It’s difficult to change
    Once the monolith starts to get big, it can be incredibly difficult to alter, and generally the complexity of changing anything is exponential to the size of the application. With so much code and so many paths in the system, reasoning about changes can be very difficult and even a small commitment can have a huge unforeseen impact. This makes the engineers who were originally responsible for the monolith very, very important for maintaining it, which can be a problem organizationally.
  • Scaling is tricky
    When your monolith scales, you can’t just scale parts of it—you scale all of it. If your monolith will only run on very powerful servers, you’re paying for a lot of server time to potentially scale a very small part of your application. This can drain your operations budget very quickly, and yet most of the capacity you’re paying for you won’t even effectively use.

The takeaway: Most developers consider monoliths the way of the past. Some still embrace them, but you’re much more likely to run into teams espousing the value of microservices.

Microservices
By comparison, microservices offer many benefits, but also a few real drawbacks. A microservice is just a single part of your larger application, presented as an application in and of itself. For example, if you run a web store, your inventory tracking, label generator, and credit card charger may all be independent microservices responsible for just one concern—they’ll have their own database and their own API for communicating with other parts of your system. By working together, they provide a seamless experience to the user, but behind the scenes they’re all independent.

Pros

  • It’s easy to maintain and understand
    Each application has one primary purpose. Reasoning about an application’s behavior is usually quite simple if it’s built with a laser-like focus on that purpose. Developers can easily jump in and out of projects, leading to less information siloing. Even better, development tends to be fast; testing suites are comprehensive and quick-to-run; and with the proper tools, zero downtime deployments are easy. Microservices are a joy to code for.
  • Better isolation leads to less downtime
    When an application fails, the other applications around it are unaffected. So even if your order taking system is down, customers can still check the status of their existing orders or possibly even browse the store while being none the wiser. And if you need to scale, you can scale only an overwhelmed system without needing to pay for capacity you won’t use.

Cons

  • It requires lots of infrastructure automation
    Microservices are operationally complex. Instead of just one application, you’re running a dozen, or several dozen, or even hundreds of them. You can’t manage them on just one server, and you can’t deploy them by hand. You need a deployment and development process that automates the complexity away, or else it’ll drown your engineers.
  • Crosscutting concerns are difficult
    Getting data from service to service in a consistent, sensible way can be very difficult. Usually if you find yourself passing a ton of messages from one place to another (say, user objects all over the place) you probably need a new microservice responsible just for the canonical representation of those messages (a user microservice, that could also possibly handle authentication). This is quite a bit harder than the equivalent for monoliths, however, where all the data is “just there.”

The takeaway: Despite their flaws, microservices are generally considered better than monoliths architecturally: They are easy to improve and manage, and operations difficulties can be passed to a DevOps team experienced in handling them. But if you want a middle ground between the two, you’re probably looking for a self-contained service.

Self-Contained System
A self-contained system, the new architectural kid on the block, is partway between a monolith and a microservice. It wraps a number of microservices to appear as one entity, but is still smaller to reason about than a monolith. If you have a number of components that are very tightly coupled—too tightly for a microservice to make sense—then what you want is a self-contained system. Self-contained services are very new. Their differences from microservices and monoliths are a matter of degree, not kind.

Pros

  • You get the best of both worlds
    With a self-contained system, you gain the benefits of monolithic simplicity: Crosscutting concerns are easy to handle, and you also get the ease of coding and deploying that microservices enjoy. You don’t need to worry about message passing or canonical data representations, since all data the app cares about is internal. What could be easier?

Cons

  • It’s architecturally difficult to define
    The line between a microservice and a self-contained system is muddy, if it even exists. Many services you may want to include inside a self-contained system actually fit better outside of it. Then you’ll be forced to do a painful separation process to break out your service. And there are precious few resources to tell you if a feature should be inside or outside of your self-contained system.

The takeaway: Ultimately, because self-contained systems are so new and so little guidance exists, microservices are a better choice for development teams—at least for right now. That said, self-contained systems are perfect for people looking toward microservices. Breaking up a monolith along sensible seams and creating self-contained systems is a great first step to the eventual adoption of microservices across your organization.

Conclusion
Though self-contained systems are hot and new, and microservices are popular and cool, it’s impossible to definitively say which architecture is the right one for your application. Many of the most popular applications on the internet are monoliths, and are still extremely successful; there’s something to be said for reliability and simplicity. Only by weighing the pros and cons of the different software architectures will you be able to choose the right one for your organization. Whichever you choose, embrace it intentionally and learn everything about your choice, and you’ll be able to support it and enhance it moving forward.

The post Microservices, Monoliths, and Self-Contained Systems: Time to Break it Down appeared first on Application Performance Monitoring Blog | AppDynamics.

@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 
(June 6-8, 2017, Javits Center, Manhattan)

DevOps at Cloud Expo / @ThingsExpo 2017 Silicon Valley
(October 31 - November 2, 2017, Santa Clara Convention Center, CA)

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:

  • Featured on-site presentation and ongoing on-demand webcast exposure to a captive audience of industry decision-makers.
  • Showcase exhibition during our new extended dedicated expo hours
  • Breakout Session Priority scheduling for Sponsors that have been guaranteed a 35-minute technical session
  • Online advertising in SYS-CON's i-Technology Publications
  • Capitalize on our Comprehensive Marketing efforts leading up to the show with print mailings, e-newsletters and extensive online media coverage.
  • Unprecedented PR Coverage: Editorial Coverage on DevOps Journal
  • Tweetup to over 75,000 plus followers
  • Press releases sent on major wire services to over 500 industry analysts.

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 
(June 6-8, 2017, Javits Center, Manhattan)

@CloudExpo / @ThingsExpo 2017 Silicon Valley
(Oct. 31 - Nov. 2, 2017, Santa Clara Convention Center, CA)

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

Sponsorship Opportunities

Sponsors of Cloud Expo @ThingsExpo will benefit from unmatched branding, profile building and lead generation opportunities through:

  • Featured on-site presentation and ongoing on-demand webcast exposure to a captive audience of industry decision-makers
  • Showcase exhibition during our new extended dedicated expo hours
  • Breakout Session Priority scheduling for Sponsors that have been guaranteed a 35 minute technical session
  • Online targeted advertising in SYS-CON's i-Technology Publications
  • Capitalize on our Comprehensive Marketing efforts leading up to the show with print mailings, e-newsletters and extensive online media coverage
  • Unprecedented Marketing Coverage: Editorial Coverage on ITweetup to over 100,000 plus followers, press releases sent on major wire services to over 500 industry analysts

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.

Secrets of Sponsors and Exhibitors ▸ Here
Secrets of Cloud Expo Speakers ▸ Here

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
Track 2. Enterprise Cloud | Digital Transformation
Track 3. DevOps, Containers & Microservices 
Track 4. Big Data | Analytics
Track 5. Industrial IoT
Track 6. IoT Dev & Deploy | Mobility
Track 7. APIs | Cloud Security
Track 8. AI | ML | DL | Cognitive Computing

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.

@CloudExpo is accepting submissions for this new track, so please visit www.CloudComputingExpo.com for the latest information.

Speaking Opportunities

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
SYS-CON Media (www.sys-con.com) has since 1994 been connecting technology companies and customers through a comprehensive content stream - featuring over forty focused subject areas, from Cloud Computing to Web Security - interwoven with market-leading full-scale conferences produced by SYS-CON Events. The company's internationally recognized brands include among others Cloud Expo® (@CloudExpo), Big Data Expo® (@BigDataExpo), DevOps Summit (@DevOpsSummit), @ThingsExpo® (@ThingsExpo), Containers Expo (@ContainersExpo) and Microservices Expo (@MicroservicesE).

Cloud Expo®, Big Data Expo® and @ThingsExpo® are registered trademarks of Cloud Expo, Inc., a SYS-CON Events company.

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In high-production environments where release cycles are measured in hours or minutes — not days or weeks — there's little room for mistakes and no room for confusion. Everyone has to understand what's happening, in real time, and have the means to do whatever is necessary to keep applications up and running optimally.

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