What exactly defines production?

Question

Like almost anyone who's been programming for a while, I'm familiar with the term "production code" and have a vague sense of what it means. However, can someone offer a semi-rigorous definition, since it seems Wikipedia and Google can't? It seems like there are a lot of gray areas in what counts as production, such as internal tools that are used by a small group of people and therefore not "formalized" in terms of UI, documentation, etc. and open source apps that are feature complete, reasonably bug free and working, but lack polish, UI and extensive testing.

Answer 1

When your code runs on a production system, that means it is being used by the intended audience in a real-world situation.

Production code, however, does not necessarily mean robust, reliable, or stable code. The Daily WTF provides plenty of evidence in this regard.

Answer 2

Production means anything that you need to work reliably, and consistently.

Whether is a build script, or a public facing web server.

When others rely on your code, particularly folks who may not understand it (i.e. even "smart" developers but perhaps not in your group, but using a library you wrote), that code is production code.

It's production because "work stops" and "money is lost" when the production code fails.

Answer 3

The definition as I understand it is that production code is any code that is installed or in use on a live, non-test-bed system. A server used internally to a company is a production system if it is the live system used by the employees of the company. The point here is that code running on a server internal to the company writing the code can be production code.

Usually, a good distinction when looking at internal code is whether or not the group maintaining the code is separate from the group using the code. If the groups are separate, odds are that the code is production code. If running the business depends on the code, then it is certainly production code, even if it is developed and maintained in-house.

Answer 4

EDIT: The short answer: If you are "betting the farm on it", it is "production".

This is a great question--an absolutely critical distinction that routinely gets everyone in trouble due to misunderstandings. The question of what is "production" is a subset of the related question of what is an "environment".

So part of the answer is that "production" is THE "environment" that is most important and is most trusted as THE "real" thing.

So now we must define "environment" (and then revisit "production"). We are still far from a satisfactory answer.

We programmers use the term "environment" constantly to refer to computer systems consisting of hardware that is executing software. That software is the code that we wrote plus software that it depends upon, which was written by others. We write our code and integrate it with the other software, then we typically run the integrated software through an escalating series of tests (unit tests, integration tests, functional tests, acceptance tests, regression tests, etc.), until we finally run the integrated software in the full manner in which it was intended.

Of course, not everything is fully automated. There are usually numerous people involved, and they have manual processes to perform. We programmers look for ways to automate as many of these processes as possible, but there is always a "man/machine boundary" in the systems we work on. Often, there are many such boundaries in any particular case.

On the other hand, there may not be any significant automation at all. For example, we spoke of "production" way back when we had a room full of people performing manual labor which produced a product. So, there doesn't have to be any automation present in our "production" "environment". There is also a middle ground, where the automation involved does not include software, such as in the case of a person running a loom to weave cloth.

Also, there may not be a product, since we have adapted our language of "production" "environment" to include product-less service providers.

Likewise, the testing may not involve software, since we may be testing a non-software-driven machine (e.g., the loom) or even the people (training and evaluation).

Now we have touched on all the crucial elements of an "environment":

• there is a purpose, an intent, being pursued
• an intent requires an intender, so there must be a sponsor (a person or group, but not a machine) that specifies the intent
• that intent is pursued through various processes that are performed by various actors
• those actors may be people, they may be software executing on hardware, or they may be non-software-driven machines, so there may or may not be automation present

Now we can properly and fully define our original terms.

An environment consists of all the processes and their actors that collaborate to pursue a particular intent on behalf of its sponsor. That means software executing on hardware, that means non-software-driven machines, and that means people performing their various duties. It is the intent that primarily defines an environment, not its processes or its actors.

Furthermore...

If the intent being pursued in a particular environment is the sponsor's ultimate goal, which usually involves producing a product or providing a service in exchange for money, then we refer to that environment as production.

Now we can go a bit further.

If the intent being pursued in an environment is the verification of processes and their actors in preparation for production, we call that a test environment.

We further call it an integration environment if that testing involves the initial joining together of significant individuals or groups of processes and their actors.

If that preparation involves the "programming" of human actors to perform new processes, or the subsequent verification (evaluation), then we call that a training environment.

Armed with these distinctions and definitions, we can now understand several common scenarios.

An environment can be mislabeled with a name that does not match its intent, such as when a training environment is used as test.

An environment can be grossly misused, such as when integration or training is done in production.

An environment can be misrepresented, such as when key processes or actors are left unidentified (e.g., manual reconciliations, or even by ignoring the people altogether).

An environment can be retasked, by repurposing its processes and actors to a new intent. A very successful technique for some organizations is to routinely "flip" several sets of actors (servers hosting software) between production, test, training, and integration upon each release.

In most cases, a single actor (person or hardware) can execute multiple processes which can participate in multiple environments. For example, a single computer server can host software that performs production transactions while also hosting other software that performs test or training functions.

Normally, a single instance of an actor should participate in only one environment at a time. On very rare occasion, a single actor can be shared across environments if the intents are mutually compatible. Most of the time, it is very unwise to attempt such sharing because the intents are not really compatible. A perfect example is running a test process on a server that also supports production processes, resulting in downtime because the test caused the entire server to fail.

Therefore, the intent of an environment must be construed with very wide latitude, to include concepts such as availability, reliability, performance, disaster recovery, accuracy, precision, repeatability, longevity, etc. This means that the actors and processes must often be construed to include things like providing power, cooling, backups, and redundancy.

Finally, note that the situation can get quite complex. For example, a desktop computer (actor) may be tasked by the development team (sponsor) to host their source control (process), which the team relies upon for their primary jobs (production). Nevertheless, the IT staff sees that same desktop computer as simply a developer workstation (development, not production) and treats it with contempt and nonchalance when it develops a hardware problem. But the developers are producing production code, so aren't they also part of production? Perspective matters.

EDIT: Production quality

A solid verification (testing) methodology should take packaged code from development and run it through a series of tests (integration, TQA, functional, regression, acceptance, etc.) until it comes out the other side "stamped" for production use. However, that makes the package production quality, but not actually production. The package only becomes production when a sponsor actually deploys it into an environment with that ultimate level of intent.

However, if your organization merely produces that package (its product) for the consumption of others, then such a release comes as close to production as that organization will experience with respect to that product, so it is common to stretch the term production to apply rather than clarify that it is production quality. In reality, that organization's production environment consists of the actors and processes involved in its development/release efforts that result in that product.

I said it could get quite complex...

Answer 5

Any code that will be used by it's intended userbase would fit into my definition of 'production code'.

Of course, the grey area in that definition would be clearly defining who your userbase is.

G-Man

Answer 6

• The production software can perform at the necessary workload without disruption or degradation of the service
• Software has been successfully tested in different production scenarios
• Transforming working prototype into production software which runs on fail-safe redundant architecture that can work in real business, i.e. production environment, needs time, code refactoring, and attention to details
• The production code has acceptable level of maintainability and is reasonably well commented
• The documentation manual explains functionality, all features and facilitates maintenance
• If the production software is an international service or application, it must be localized
• Production code is used by end-users, often customers under conditions described in Terms-of-Service Agreement
• Production software does not necessarily mean reliable mission critical software
• The software does well, what it was intended to do
• Log files provide an accurate description of run-time performance and software reliability metrics and reporting which do facilitate debugging and software maintainability

Answer 7

I think the best way to describe it, is as any code that "leads-to" deployment and "follows-up" deployment. Deployment itself is defined as all of the activities that make a software system available for use. If your code is ready to be used by people, in-house or otherwise, then it is production code.