Beyond Continuous Deployment: Feedback
Paul Duvall believes the principle behind all modern approaches to development can all be boiled down to a single word: feedback.
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If I were to whittle the principle behind all modern software development approaches into one word, that word would be feedback. By “modern approaches,” I’m referring to DevOps, Continuous Integration (CI), Continuous Delivery (CD), Continuous Deployment, Microservices, and so on. For definitions of these terms, see the Stelligent Glossary.
It’s not just feedback: it’s fast and effective feedback. It’s incorporating that feedback into subsequent behavior. It’s amplifying this feedback back into the development process to affect future work as soon as possible.
In this post, I describe how we can move beyond continuous deployment by focusing on the principle of feedback.
I think it’s important to define all of this as one word and one principle because it’s so easy to get lost in the weeds of tools, processes, patterns, and practices. When I’m presented with a new concept, a problem, or an approach in my work, I often ask myself, “How will this affect feedback? Will it increase fast, effective feedback or decrease it?” These questions often help guide my decision making.
Amazon Web Services (AWS) has a great talk on how Amazon embraced DevOps in their organization (well before it was called “DevOps”). As part of the talk, they show an illustration similar to the one you see below in which they describe the feedback loop between developers and customers.
Deployment Pipeline Feedback Loop (Based on: https://aws.amazon.com/devops/what-is-devops/)
They go on to describe two key points with this feedback loop:
- The faster you’re able to get through the feedback loop determines your customer responsiveness and your ability to innovate.
- In the eyes of your customers, you’re only delivering value when you’re spending time on the left side—developing new features.
The key, as AWS describes, is that any time you spend on building the pipeline itself or hand-holding changes through this pipeline is not delivering value—at least in the eyes of your customer. So, you want to maximize the time you’re spending on the left side (developing new features) and minimize the time you’re spending in the middle—while delivering high-quality software that meets the needs of your customers.
They go on to describe DevOps as anything that helps increase these feedback loops, which might include changes to the organization, process, tooling, or culture.
There’s a vision on feedback that I’ve discussed with a few people and only recently realized that I hadn’t shared with the wider software community. In many ways, I still feel like it’s “Day 1” when it comes to software delivery. As mentioned, there’s been the introduction of some awesome tools, approaches, and practices in the past few years like Cloud, Continuous Delivery, Microservices, and Serverless but we’ll be considering all of this ancient times several years from now.
Martin Fowler is fond of saying that software integration should be a “non event”. I wholeheartedly agree but the reality is that even in the best CI/CD environments, there are still lots of events in the form of interruptions and wait-time associated with the less creative side of software development (i.e. the delivery of the software to users).
The vision I describe below is inspired by an event on Continuous Integration that I attended in 2008 that Andy Glover describes on The Disco Blog. I’m still working on the precise language of this vision, but by focusing on fast and effective feedback, it led me to what I describe here:
Beyond Continuous Deployment
Using smart algorithms, code is automatically integrated and pushed to production in nanoseconds as a developer continues to work as long as it passes myriad validation and verification checks in the deployment pipeline. The developer is notified of success or failure in nanoseconds passively through their work environment.
I’m sure there are some physics majors who might not share my “nanoseconds” view on this, but sometimes approaching problems devoid of present-day limitations can lead to better future outcomes. Of course, I don’t think people will complain if it’s “seconds” instead of “nanoseconds” as it moves closer toward the vision.
This vision goes well beyond the idea of today’s notion of “Continuous Deployment” which relies on developers to commit code to a version control repository according to the individual developer’s idiosyncrasies and schedule. In this case, smart algorithms would determine when and how often code is “committed” to a version-control repository and, moreover, these same algorithms are responsible for orchestrating it into the pipeline on its way to production.
These smart algorithms could be applied when a code block is complete or some other logical heuristic. It’d likely use some type of machine learning algorithm to determine these logical intervals, but it might equate to hundreds of what we call “commits” per developer, per day. As a developer, you’d continue writing code as these smart algorithms automatically determine the best time to integrate your changes with the rest of the code base. In your work environment, you might see some passive indicators of success or failure as you continue writing code (e.g. color changes and/or other passive notifiers). The difference is that your work environment is informing you not just based on some simple compilation, but based upon the full creation and verification of the system as part of a pipeline—resulting in an ultra fast feedback cycle.
The “developer’s work environment” that I describe in the vision could be anything from what we think of as an Integrated Development Environment (IDE) to a code editor, to a developer’s environment managed in the cloud. It doesn’t really matter because the pipeline runs based on the canonical source repository as defined and integrated through the smart algorithms and orchestrated through a canonical pipeline.
Some deployment pipelines today effectively use parallel actions to increase the throughput of the system change. But, even in the most effective pipelines, there’s still a somewhat linear process in which some set of actions relies upon preceding actions to succeed in order to initiate its downstream action(s). The pipelines that would enable this vision would need to rethink the approach to parallelization in order to provide feedback as fast I’m suggesting.
This approach will also likely require more granular microservices architectures as a means of decreasing the time it takes to provide fast and effective feedback.
In this vision, you’d continue to separate releases from deployments whereas deployments will regularly occur in this cycle, but releases would be associated with more business-related concerns. For example, you might have thousands of deployments for a single application/service in a week, but maybe only a single release during that same time.
If a deployment were to fail, it wouldn’t deploy the failure to production. It only deploys to production if it passes all of the defined checks that are partially built from machine learning and other autonomic system techniques.
By focusing on the principle of feedback, you can eliminate a lot of the “noise” when it comes to making effective decisions on behalf of your customers and your teams. Your teams need fast and effective feedback to be more responsive to customers. I shared how you can often arise at better decisions by focusing on principles over practices. Finally, this vision goes well beyond today’s notion of Continuous Deployment to enable even more effective engineer and customer responsiveness.
Published at DZone with permission of Paul Duvall, DZone MVB. See the original article here.
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