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Search - "bottlenecks"
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Boy do I hate office politics...
A client asked our company to fix perf issues on their product. Our coleagues had been picked for the job [being led by another 3rd-party, as per client's request]. Aaand they dropped the ball. The deadline is in 2 weeks, nothing is working.
Mgmt engaged us to put out the fire, but strictly at the scope the other guys were working in.
On the first day of testing we've revealed an elephant-sized perf issue that's as easy to fix as brainlessly changing 4 values in config. And that elephant is masking all the other perf issues.
We got a firm NO for config changes as that is out of the defined scope. And we're asked to continue testing.
I mean, the elephant is THAT huge that any further testing is moot - all other bottlenecks are hidden behind it. And just changing those 4 values would reduce the resources required by a magnitude of ~10.
But that's out of scope...
Client is desperate, lost and honestly asking us, pros in the field, for help.. We know how to help.. It takes 10 seconds to apply the fix..
But our mgmt forbids us to step out of the scope :/
as a result we have to pretend to be dummies hardly knowing what to do and hide the truth from the customer they so desperately want.
This is frustrating. And wrong. And imo unprofessional10 -
Biggest challenge I overcame as dev? One of many.
Avoiding a life sentence when the 'powers that be' targeted one of my libraries for the root cause of system performance issues and I didn't correct that accusation with a flame thrower.
What the accusation? What I named the library. Yep. The *name* was causing every single problem in the system.
Panorama (very, very expensive APM system at the time) identified my library in it's analysis, the calls to/from SQLServer was the bottleneck
We had one of Panorama's engineers on-site and he asked what (not the actual name) MyLibrary was and (I'll preface I did not know or involved in any of the so-called 'research') a crack team of developers+managers researched the system thoroughly and found MyLibrary was used in just about every project. I wrote the .Net 1.1 MyLibrary as a mini-ORM to simplify the execution of database code (stored procs, etc) and gracefully handle+log database exceptions (auto-logged details such as the target db, stored procedure name, parameter values, etc, everything you'd need to troubleshoot database errors). This was before Dapper and the other fancy tools used by kids these days.
By the time the news got to me, there was a team cobbled together who's only focus was to remove any/every trace of MyLibrary from the code base. Using Waterfall, they calculated it would take at least a year to remove+replace MyLibrary with the equivalent ADO.Net plumbing.
In a department wide meeting:
DeptMgr: "This day forward, no one is to use MyLibrary to access the database! It's slow, unprofessionally named, and the root cause of all the database issues."
Me: "What about MyLibrary is slow? It's excecuting standard the ADO.Net code. Only extra bit of code is the exception handling to capture the details when the exception is logged."
DeptMgr: "We've spent the last 6 weeks with the Panorama engineer and he's identified MyLibrary as the cause. Company has spent over $100,000 on this software and we have to make fact based decisions. Look at this slide ... "
<DeptMgr shows a histogram of the stacktrace, showing MyLibrary as the slowest>
Me: "You do realize that the execution time is the database call itself, not the code. In that example, the invoice call, it's the stored procedure that taking 5 seconds, not MyLibrary."
<at this point, DeptMgr is getting red-face mad>
AreaMgr: "Yes...yes...but if we stopped using MyLibrary, removing the unnecessary layers, will make the code run faster."
<typical headknodd-ers knod their heads in agreement>
Dev01: "The loading of MyLibrary takes CPU cycles away from code that supports our customers. Every CPU cycle counts."
<headknod-ding continues>
Me: "I'm really confused. Maybe I'm looking at the data wrong. On the slide where you highlighted all the bottlenecks, the histogram shows the latency is the database, I mean...it's right there, in red. Am I looking at it wrong?"
<this was meeting with 20+ other devs, mgrs, a VP, the Panorama engineer>
DeptMgr: "Yes you are! I know MyLibrary is your baby. You need to check your ego at the door and face the facts. Your MyLibrary is a failed experiment and needs to be exterminated from this system!"
Fast forward 9 months, maybe 50% of the projects updated, come across the documentation left from the Panorama. Even after the removal of MyLibrary, there was zero increases in performance. The engineer recommended DBAs start optimizing their indexes and other N+1 problems discovered. I decide to ask the developer who lead the re-write.
Me: "I see that removing MyLibrary did nothing to improve performance."
Dev: "Yes, DeptMgr was pissed. He was ready to throw the Panorama engineer out a window when he said the problems were in the database all along. Didn't you say that?"
Me: "Um, so is this re-write project dead?"
Dev: "No. Removing MyLibrary introduced all kinds of bugs. All the boilerplate ADO.Net code caused a lot of unhandled exceptions, then we had to go back and write exception handling code."
Me: "What a failure. What dipshit would think writing more code leads to less bugs?"
Dev: "I know, I know. We're so far behind schedule. We had to come up with something. I ended up writing a library to make replacing MyLibrary easier. I called it KnightRider. Like the TV show. Everyone is excited to speed up their code with KnightRider. Same method names, same exception handling. All we have to do is replace MyLibrary with KnightRider and we're done."
Me: "Won't the bottlenecks then point to KnightRider?"
Dev: "Meh, not my problem. Panorama meets primarily with the DBAs and the networking team now. I doubt we ever use Panorama to look at our C# code."
Needless to say, I was (still) pissed that they had used MyLibrary as dirty word and a scapegoat for months when they *knew* where the problems were. Pissed enough for a flamethrower? Maybe.9 -
I worked once in a company which had this tourist app which should show places on map of the city. Unfortunately it slowed the App down to load more then a couple of places. Their solution was to limit the number of loaded places to teb and prohibited zomming out. I made it handle thousands of places at the same time. Main reason for the Performance issue was, that they sent all data they had about places big, big json objects with large text blobs) to the frontend. This part was easy, I instead sent only the data needed for the map like coordinates and icon type obviously. But still the backend struggeled hard with many objects from the DB, because they built a really shitty orm or what ever this was supposed to be: every line of data retrieved from the DB was immideatly wrapped in some class wich direved from another class which had some magic methods in it which caused some absurd loops over all other obejcts and even more DB queries in unexpected moments and also in the fucking constructor. So it turrned out that the map issue was only the top of the iceberg, since using any data from the DB was extremely expensive. The hard part was to understand the insaness of this abnormination and find the bottlenecks.8
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When the CTO/CEO of your "startup" is always AFK and it takes weeks to get anything approved by them (or even secure a meeting with them) and they have almost-exclusive access to production and the admin account for all third party services.
Want to create a new messaging channel? Too bad! What about a new repository for that cool idea you had, or that new microservice you're expected to build. Expect to be blocked for at least a week.
When they also hold themselves solely responsible for security and operations, they've built their own proprietary framework that handles all the authentication, database models and microservice communications.
Speaking of which, there's more than six microservices per developer!
Oh there's a bug or limitation in the framework? Too bad. It's a black box that nobody else in the company can touch. Good luck with the two week lead time on getting anything changed there. Oh and there's no dedicated issue tracker. Have you heard of email?
When the systems and processes in place were designed for "consistency" and "scalability" in mind you can be certain that everything is consistently broken at scale. Each microservice offers:
1. Anemic & non-idempotent CRUD APIs (Can't believe it's not a Database Table™) because the consumer should do all the work.
2. Race Conditions, because transactions are "not portable" (but not to worry, all the code is written as if it were running single threaded on a single machine).
3. Fault Intolerance, just a single failure in a chain of layered microservice calls will leave the requested operation in a partially applied and corrupted state. Ger ready for manual intervention.
4. Completely Redundant Documentation, our web documentation is automatically generated and is always of the form //[FieldName] of the [ObjectName].
5. Happy Path Support, only the intended use cases and fields work, we added a bunch of others because YouAreGoingToNeedIt™ but it won't work when you do need it. The only record of this happy path is the code itself.
Consider this, you're been building a new microservice, you've carefully followed all the unwritten highly specific technical implementation standards enforced by the CTO/CEO (that your aware of). You've decided to write some unit tests, well um.. didn't you know? There's nothing scalable and consistent about running the system locally! That's not built-in to the framework. So just use curl to test your service whilst it is deployed or connected to the development environment. Then you can open a PR and once it has been approved it will be included in the next full deployment (at least a week later).
Most new 'services' feel like the are about one to five days of writing straightforward code followed by weeks to months of integration hell, testing and blocked dependencies.
When confronted/advised about these issues the response from the CTO/CEO
varies:
(A) "yes but it's an edge case, the cloud is highly available and reliable, our software doesn't crash frequently".
(B) "yes, that's why I'm thinking about adding [idempotency] to the framework to address that when I'm not so busy" two weeks go by...
(C) "yes, but we are still doing better than all of our competitors".
(D) "oh, but you can just [highly specific sequence of undocumented steps, that probably won't work when you try it].
(E) "yes, let's setup a meeting to go through this in more detail" *doesn't show up to the meeting*.
(F) "oh, but our customers are really happy with our level of [Documentation]".
Sometimes it can feel like a bit of a cult, as all of the project managers (and some of the developers) see the CTO/CEO as a sort of 'programming god' because they are never blocked on anything they work on, they're able to bypass all the limitations and obstacles they've placed in front of the 'ordinary' developers.
There's been several instances where the CTO/CEO will suddenly make widespread changes to the codebase (to enforce some 'standard') without having to go through the same review process as everybody else, these changes will usually break something like the automatic build process or something in the dev environment and its up to the developers to pick up the pieces. I think developers find it intimidating to identify issues in the CTO/CEO's code because it's implicitly defined due to their status as the "gold standard".
It's certainly frustrating but I hope this story serves as a bit of a foil to those who wish they had a more technical CTO/CEO in their organisation. Does anybody else have a similar experience or is this situation an absolute one of a kind?2 -
Being an almost 20y old JVM language, you'd expect it to already have been rewritten in itself. IT FUCKING WASN'T.
But, "hey, it's a hosted…", stop fooling yourself, its "sneaking in work" capability has such bottlenecks that SCI was created.
You'd think its stack traces would be better than Java's, after all, it was supposed to be an improvement… They're worse.
Oh, "we've got a REPL". The amount of alternative REPLs available for it shows how bad the default one is.
There's more, but the gist of it is that none of the above is truly the culprit of its shitty language adoption rates.
It's its implementation code.
Have you taken a peak at Clojure's implementation code??
Last edit was in 2012.
Not because of stability, but because the fucking thing is a tightly coupled monolithic mess.
It's such fucking outdated messy Java that any change by none other than Rich Rickey (creator) would BREAK THE FUCKING THING
That's it, I'm done ranting
Fuck Clojure
fuck its implementation
there's no fixing it
Unless they do it Elm style and risk nailing Clojure's coffin shut
Also, on ClojureScript, WHY THE FUCK WOULD YOU TAKE THE SHIT ABOVE AND WRITE A COMPILER WITH IT? Targeting none other than another shitty language: JavaScript8 -
Need advice about switching to contracting.
TL;DR;
So I had 2 years of exp as an android dev, then I had a 1.5 year gap from doing android and now for the past 6 months Ive been doing android again fulltime. Im thinking of switching to contracting due to my debts and boring project and life crushing slow corporate processes in my current fulltime job, so I need tips and advices as to where should I start looking for new contracting gigs and in general what should I pay attention to. If it helps, I am based in EU, but am open to any EU/US gigs.
Now the full story:
Initially when I joined my current fulltime job after a break I had zero confidence, lowered my and employers expectations, joined as a junior but quickly picked up the latest standards and crushed it. Im doing better than half devs in my scrum team right now and would consider myself to be a mid level right now.
Asked for a 50% bump, manager kinda okayed it but the HQ overseas is taking a very long time to give me the actual bump. I have been waiting for 10 weeks already (lots of people in the decision chain were on and off vacations due to summer, also I guess manager sent this request to HQ too late, go figure). Anyways its becoming unnaceptable and I feel like its time for a change.
Now since I have mortgage and bills to pay, even with the bump that I requested that would leave me with like maximum 700-800 bucks a month after all expenses. I have debts of around 20k and paying them back at this rate would take 3 years at least and sounds like a not viable plan at all.
Also it does not help that the project Im working on is full of legacy and Im not learning anything new here. Corporate life seems to be very slow, lots of red tape kills creativity and so on. I remember in startups I was cooking features left and right each sprint, in here deploying a simple popup feature sometimes takes weeks due to incompetence in the chain. I miss the times where I worked in startups, did my job learned nre skills and after 6 months could jump on another exciting gig. Im not growing here anymore.
So because my ADD brain seems to be suited much better for working in startups, and also I need to make more money quick and I dont see a future in current company, I am thinking of going back to contracting. All I need right now is to build a few side apps, get them reviewed by seniors and fill my knowledge gaps. Then I plan of starting interviewing as a mid level or even a senior for that matter, since I worked with actual seniors and to be honest I dont think getting up to their level would be rocket science.
Only difference between mid and senior devs that I see atleast in my current company is that seniors are taking on responsibility more often, and they also take care of our tools, such as CD/CI, pipeline scripts, linters and etc. Usually seniors are the ones who do the research/investigations and then come up with actual tasks/stories for mids/juniors. Also seniors introduce new dependencies and update our stack, solve some performance issues and address bottlenecks and technical debt. I dont think its rocket science, also Ive been the sole dev responsible for apps in the past and always did decent work. Turns out all I needed was to test myself in an environment full of other devs, thats it. My only bottleneck was the imposter syndrome because I was a self taught dev who worked most of my career alone.
Anyways I posted here asking for some tips and advices on how to begin my search for new contract opportunities. I am living in EU, can you give me some decent sites where I could just start applying? Also I would appreciate any other tips opinions and feedback. Thanks!3