Building something of value

On occasion, I like to build stuff – usually out of wood.  To my credit, I’ve made a few pieces of furniture in my day (a baby change table, a curio cabinet, a chest of drawers, and a few other things).  But not everything I do in the garage results in a usable piece of furniture.  Sometimes it seems like I’m out there – “puttering”.  In same cases, it’s making a new tool to make the next job easier.  Other times, it’s tidying up after making a mess.  On the rare occasion, I’ll do some sort of experiment – like trying to polish a coconut or making a homemade frame saw.  These experiments don’t always result in some sort of usable product, but there is learning to be had.

Sometimes I wonder why people creating some products.  The “Juicero ” seems to be the latest Silicon Valley punching bag.  For those not familiar with it, it’s basically a machine that punches a small hole in a pouch of juice and pours it into a cup.  It’s easy to see how the idea came to be.  Coffee machines that use the little pods seem to be the latest rage, and a good money maker.  But not everyone drinks coffee.  So why not little pods of juice?  The problem is that there’s no work needed.  At least with a coffee machine, it has to mix the contents of the pod with water and heat it up.  With the juice… nothing.  It basically just pours you a cup of juice.  That’s not a problem that needed solving.  It offers little to no value.

So what happens if you are being forced by upper management to build a product that you see that has little to no value?

That’s a question I don’t have an answer for.

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Symptoms vs. Underlying Cause

Let’s pretend for a minute that you aren’t a software developer, and that you are a doctor.  A patient comes in with the following symptoms:

  • Fever
  • Trouble walking
  • Redness and swelling around a wound on the leg

Do you:

  1. Give the patient a band-aid, pain killer, a walking cane, and a cold bath?
  2. Investigate and clean the wound, administer antibiotics, and recommend rest?

Sometimes in software development, we see things just like this.  We see the symptoms of a deeper underlying issue, but we get fixated on solving or fixing the symptoms rather than the underlying cause.  Let’s take a more software related example.

A customer occasionally sees a database error.  Do you:

  • Wrap everything in a try/except and display a nicer error message (or hide it altogether.  It’s not like the customer can do anything about it, right)?
  • Investigate the command that was causing the database error, and fix the underlying problem that allows the error to happen in the first place?

It seems totally obvious what the better solution is in this case, but so often things are patched with duct tape, chewing gum, bailing wire, and band-aids.  After a while, it becomes a disgusting mess that no one wants to deal with it.  At that point (or well before that point!) developers start crying for a re-write or a refactor.  A good case of “refactoritis” can be a sign that things haven’t been properly fixed along the way.  Maybe a rewrite or refactoring is necessary.  Maybe it isn’t.  But either way, the temporary solutions need to stop, and underlying issues need proper investigation.

 

Sometimes information really is worthless

You may not immediately agree with me, but hear me out.  Some information really is worthless.

I had the “pleasure” of being involved with a project that loaded data from a CSV, and imported that data into a second system.  The purpose of the second system was quite different, and it really only needed maybe three or four fields from the CSV (which had a lot more columns than that!).  When the code was written to import the CSV, it imported everything, whether it was going to be used or not.  I get why it was done (the developer didn’t know any better), but by doing so, the developer introduced more code, more data, and more maintenance cost.

I get that the value of recorded information often isn’t readily visible (especially without any sort of visualization of that data), but there are cases where information really is useless.

It’s a bit like going up and asking someone where the nearest toilet is, and they proceed to tell you not only where it is, but the entire history of indoor plumbing.  For the specific use case that you are wanting, knowing about London’s historic sewage pumping station isn’t going to help you do your business any faster.

The Power of Answering Questions

In chatting with a friend, this thought popped into my mind:

What value is there in answering questions?  How does it empower the person with the answer?

It might seem a little silly, but here’s a few random questions that have “powerful” answers (in the business sense):

  • How can I automate this process?
  • How much is the grain in my grain bin worth?
  • How much does it cost me to use Product X, and is it worth it to me?
  • Where are all my assets located?
  • Do I need to keep specific inventory levels?
  • Which products are my best sellers, and what is the impact of dropping my lower selling products?
  • What is my single biggest expense, and how can I reduce it?
  • Where is the majority of my time spent?

By helping people answer questions, empower them.  And, as software developers, by having the ability to put together solutions that can answer questions, we, in essence, become powerful.

Everyone has questions, but not everyone has the means of answering those questions.  Some answers take more work than others, and some answers carry more value than others (e.g.: “How can I keep in communication with family members in an emergency?” vs. “Where did I put that hammer I was just using?”).  Either way, there is something powerful about being able to answer questions.

Bad Developer, No Twinkie Part 11: The 200 OK

I’ve seen this one happen in a few different places:

A web service that returns an HTTP status code of 200 (OK), but the message inside the response says otherwise.

HTTP status codes are there for a reason!  If the response isn’t okay, then don’t say that is is okay!  It’s like going into a doctor’s office and saying “Yeah, I’m feeling pretty good” but your arm is gushing blood because you accidentally cut it off on a table saw.

If the response isn’t okay, then use an appropriate HTTP status code to give an indication what the problem is.  Otherwise users might try to work with your response, which no longer contains the data that they are expecting.

Fix the Underlying Problem

Recently, I’ve had the pleasure of dealing with some optimization work.  I find it oddly satisfying, as it’s very quantifiable. It’s also nice to hear a happy story from an end-user, saying that something was slow, and now it’s fast.

Sometimes optimizing the user experience is a matter of actually faking the appearance of improved performance.  If a user feels that it is faster, that’s really what counts.  Some times this comes down to caching data, adding loading indicators, and making sure the main UI thread is still being responsive.  Depending on the case, that might be all that’s necessary to give a decent experience.

Other times, it’s actually digging in, and figuring out what is slow, and fixing it.  Often that is much easier said than done.  Performance bottlenecks can be almost anything from memory thrashing or cache misses to poorly designed algorithms to slow 3rd party libraries.  To fix some of these issues it can take switching to multi-threading, reorganizing data structures, revising algorithms, or switching libraries.  Changes like that often aren’t cheap.  But once the underlying issue is resolved, it still fixes the user-perceived slowness.

I prefer to find and fix the underlying problem rather than applying a band-aid.  There are times when band-aids are appropriate, but more often than not, it’s better to dig in and fix the real problem.  No quantity of band-aids will fix a bleeding femoral artery.  Likewise, no quantity of band-aids will fix a poorly written web service or a poorly thought out algorithm.

’tis better to prevent bad data…

’tis better to have loved and lost than never to have loved at all.
– Lord Tennyson

Or in programming terms:

’tis better to prevent bad data from entering the system than to have to clean it up after.

Allow me to share a recent example.

At my job, I work on a team that interacts with a lot of services.  Some of these services are under our control, and others aren’t.  One, in particular, is a legacy service that we are working to replace.  This particular service contains a set of data about machines.  We currently have a script within our main system that calls this other system, fetches data from it, and attempts to insert it into the main database.

One of the problems with the old system is that there’s a lot of user-entered data that isn’t clean.  For example, let’s say there’s a database field for the manufacturer of the machines.  Users could have entered values such as:

Chevrolet
chevrolet
Chevorlet <- note the bad spelling
chevy
Chevy

When doing string comparisons*, to a computer, all of these values are different.  So as a result, when we pull data into the new system, we end up pulling in this same bad data.

Thankfully the revisions we are making to the main system will make this kind of user-entered data a lot more difficult to enter, but unfortunately we aren’t there yet.  As a result, we now have bad data in the main system.  What really should have been done in a case like this, is that any data coming into the main system should have been cleaned prior to being entered.  The new system will eventually force a user to select the manufacturer from a drop-down list (not enter it in a text field).  This fixes things going forward, but still doesn’t clean up the older bad data.

Like I said, ’tis easier to prevent bad data…

*Avoid doing string comparisons as much as possible – especially on user-entered data!  You are just asking for pain if your code contains a lot of string comparisons.