The digital revolution has brought myriad exceptional benefits, but the one I'd like to focus on is the unifying force of shared common services; the idea that anyone, anywhere, with access to the internet can enjoy the same standard of service and, most critically, the same utility of service no matter their means or circumstance.
Whether you're a multimillionaire or working to make ends meet, this standard design is always prevalent - Amazon doesn't look any different and Google doesn't run any faster.
This is especially true for public services that are designed for all different types of people and users, and when you design something for everyone, that service must be robust and perform.
In this blog series, I look to explore and outline how modern delivery teams can build environments that scale to extreme public demand and continue to scale and perform far into the future.
Performance
Let's quickly establish the objective of performance within a digital context:
The objective of web performance is to increase the rate at which information and services are consumed across the web
This is done by reducing latency, process time and variance across all interactions in a user's session to return the system to an interactive or information state in a more consistent manner
To accomplish this, we work to improve the trail of the distribution since that is how we make systems accessible, reliable, and equitable, i.e., make the 99th percentile just as performant as the 50th.
Less is more with performance. The more we can reduce, the more we can provide. It sounds ironic but it isn't. It's surprisingly quite logical.
Performance is about quality just as much as it is about speed. Quality of outcome, quality of experience and, for many companies, quality of conversion i.e., sales.
So how do we scale for large volumes of users, those in the multi-millions, doing ever more complex workloads? Not forgetting some other important questions that we must also ask ourselves:
When is a user, not only a user?
What are the prime examples of why we might need to scale for these kinds of load profiles, is it more than just an ego session on whose cloud is bigger?
What really is the critical path to having a performant environment, and should we really care about how we get there?
First, it's important to understand the idea of when is a user, not only a user'. What exactly do I mean by this? A user that's going to the front page of a website and looking or accessing data from a CDN (Content Delivery Network) has a nominal impact on any service.
A CDN, for those not in the know, is essentially a cache that stores the resource that a user has requested on the closest possible server to them which significantly reduces latency and processing times. Pretty handy when you're dealing with a lot of users making the same request for the same service. Government information services or landing pages are great examples of services that benefit from this type of component.
A user that is streaming video content or entering long-form data content, such as a survey, will have a much larger profile than a user accessing a cached web page, this much is obvious. What's less obvious is what a user leaves behind, especially in an event-driven solution - something swiftly becoming the norm. Some examples of user baggage:
A chain of synchronous and asynchronous calls and processing events - common in event-driven architecture. These can, in many instances, take hours, days or even weeks to process long after a user has completed their web front-end action. Due to process times of data ingress services.
Network Address Translation (NATs) processing NATs are awesome, they allow provisioning of IP addresses from private networks out into the public internet or permit fancy things such as IP masquerading. However, when dealing with high volumes they can quickly become backed up . This doesn't mean the NAT stops working but the data that NAT is consuming does start to take longer to process.
Data and ETL Pipelines have ingestion rates. Especially true when they are scanning or transforming that data. The rate at which data is generated by inputs and processed by data pipelines frequently creates bottlenecks in production environments that can take measurable time to clear down.
Why do we care so much about User Baggage?
Good question. We care because if we plan to support a large volume of users continuously, and those users are going to create backlogs in our solution, we need to be certain those backlogs are going to get processed at a rate proportionate to how quickly they are being produced. We also need to make sure our event chains and data in transit are backed up, secure and robust.
Example projects that feature high volumes and have large user footprints include:
Population Censuses. Most countries carry out population-wide counts and data-gathering exercises every 10 years. These exercises put enormous write loads on a digital service and are also region-locked due to data legislation which (in turn) prevents global distribution on infrastructure. China has over 494.16 million households for example, to build a platform that could - in a relatively short amount of time - consume such a vast amount of personal data would be a huge task and well exceed the capacity of any cloud provider. Because of this, China decided to carry out a mostly physical census. The UK, however, carried out a digital-first census, with remarkable effectiveness, efficiently scaling for the whole population.
Major political change. Think of the UK exiting the EU, this required the resettlement and processing of over 3.5 million EU migrants and the updating of an import and export economy of $610B, all of which needed to be managed by a brand new digital infrastruc
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The digital revolution has brought myriad exceptional benefits, but the one I'd like to focus on is the unifying force of shared common services; the idea that anyone, anywhere, with access to the internet can enjoy the same standard of service and, most critically, the same utility of service no matter their means or circumstance.
