rolisz's site

Line charts in Javascript

Recently I wanted to take a look at some personal data that I had been collecting for several years (Quantified Self and Lifel­og­ging ftw :D). Until now it was sitting there write-only, with me oc­ca­sion­al­ly peeking at it manually, but because it was in a pretty much raw format (actually, multiple formats, from different sources), I didn't interact with it too much. However, recently I was a bit bored, I wanted to code something just for fun (as much as parsing XML files can be called fun), so I cleaned up the data and now I wanted to get some "useful" in­for­ma­tion out of it.

The data consists continue.


The concert hall

The Royal Concert Hall

In September I went to Belgium to work in a Google datacenter, near Mons, for two weeks. I took the op­por­tu­ni­ty and used the three weekends to wander around and visit a lot of places, including three capitals: Brussels, Amsterdam and Paris (hence the title of the post).

I flew to Amsterdam on Saturday morning. The first thing I wanted to do was to visit the Google office there, but it was in a commercial space, which is closed during weekends, so I couldn't get in :(. So, as I was looking around on Tri­pAd­vi­sor for where to go next, one thing kept drawing continue.

Google Tech Talk @ Babes Bolyai University

Google Tech Talk
@ Babes Bolyai

Good news everyone! I will give two pre­sen­ta­tions at the Babes Bolyai University in Cluj on the 21st of October. The first talk is aimed mostly at students and I will be talking about what I do as a Site Re­li­a­bil­i­ty Engineer and what it takes to maintain a large scale service up and running all the time. The second one is about Megastore, a database with strong con­sis­ten­cy guarantees on a global scale.

If you are interested and want to come, please register using this form.

San Francisco and the so called Mountain View


Alcatraz, where my childhood favorite movie was set, The Rock

After a week in New York and another one in hot, humid Richmond, where I had a very blessed time due to who was there, I finally arrived to the official des­ti­na­tion of my trip: Mountain View, where Google has more employees then the number of people who live in my hometown of Marghita.

The trip there consisted of a long and quite stressful day, which started off with a rush and not getting a chance to say good bye to all my new friends, then my plane getting delayed, almost missing my connecting flight, scratching my rental continue.

After a year in Zürich

rolisz around the world

One year ago today I was dis­cov­er­ing, to my shock and horror, that my laptop's charger doesn't fit in the Swiss socket. My phone charger did, but the laptop plugs pins were 0.25 mm thicker, so they did not.

Several hours earlier I boarded the plane from Budapest to Zürich, feeling like I'm going on an adventure. I did not know what was waiting for me, I didn't even know what team I would be working with, but I was very excited and looking forward to whatever was coming.

Looking back now, after a year, wow, it's been quite the adventure, so much more than I could continue.

The Big Apple

Statue of Liberty

Mandatory Statue of Liberty picture

The Big Apple. New York. The greatest city in the world, as every tour guide in the city will tell you every 5 minutes.

I went for a business trip to the USA, to Mountain View, California, but before that I took two weeks of vacation: one in New York and one in Richmond (before I get any more questions as to why on Earth would I go there, it was for a Christian Conference).

I was very curious to see New York for myself. I had heard so many things about it: some people absolutely love it, others complain about the insane continue.

The Little Daco-Hungarian Expat Makes Gulyas


After spending a long time in the fatty, sugary, GMO, antibiotic-ladden land of the USA, the little daco-hungarian decided to make himself some gulyas, for the first time ever. Here is his step-by-step recipe, with way too many pictures and details about all the mistakes he made.

In­gre­di­ents for a single person for 3 days:

  • smallest pack of packaged beef you can find (in my case it had about 250g)
  • 2 carrots
  • 5 potatoes
  • 1 red onion
  • 1 bell pepper
  • can of peas
  • 1 tomato
  • 1 egg
  • 3-4 spoons of flour
  • salt
  • ground black pepper
  • ground red Hungarian pepper (paprika)
  1. Get a clean plate all the in­gre­di­ents.

  2. Slice the meat into small pieces and remove most of continue.

Trip to Dublin

Samuel Beckett Bridge

Samuel Beckett Bridge

A month ago there was the first ever SRECon in Europe. It got together lots of SRE-like engineers (basically the people who are re­spon­si­ble for the software that is live, running in production) from Google (the host of the event), Facebook, Etsy, Splunk, SoundCloud and others. Because I'm an SRE, I had the op­por­tu­ni­ty to go there. With this occasion, I stayed two more days to have the chance to see Ireland and Dublin a bit more (yes, I know I'm terribly late with this post).


The two workshops that I enjoyed most were drumroll about statistics (by Heinrich Hartmann) and about machine learning (by Adam Oliner) continue.

Happy 5th Birthday!

5 years ago, on this day, I started this blog on And here I am, half a decade later, 2^8 posts later.

Let me tell you how it all started. I had been planning for a long time to start a blog. I actually even started one together with a highschool class-mate, but it was very short lived (we wrote a couple of posts, but never got around to making it public). I had a nice mindmap­ping chart with possible topics I wanted to talk about, possible names for the blog, possible nicknames for me (I was con­sid­er­ing doing it under a pseudonym), where to host it continue.


Spinach and salad small plants

About two months ago, we had a TetraPak gardening class at work. During this class we learned how to seed and care for spinach (left in the above picture) and salad (right) plants in a 1L milk box.

They grew quite slowly. This was after one week.

And after a month they we're this big.

And this is the end result. My breakfast 40 days after I started growing the salads. Yummy :D

But these were just short term "gar­den­ing" ex­per­i­ments. I also wanted to try my hand at keeping a plant alive for longer term.

So after a week I also bought a Hibiscus flower, continue.