Monday, June 1, 2015

Devoxx4Kids PL

Another edition of devoxx4kids has just passed in Warsaw and again great thanks to organizers. I was just a volunteer and felt some exhaustion but the effort of organizers must have been amazing.

Last year i was taking care of 8-years-old group but this year i wanted a difference and became a teacher of blockly (similar to scratch) for 10-years-old group.

It was quite fun to see the difference of approaches and progress among children. When the rest of the group was in the beginning of exercise, 2 girls were clearly ahead and finishing it. As they confessed later, they already learned scratch before and this clearly shows a need for events like this. Not every school reserves sufficient amount of time for IT education and programming so important in the times we live, even less interest i observe among girls. This results later on in how many women land in IT jobs (very little).

My lecture took only 2 hours so i had rest of the day to see around the other groups and workshops and i come to the conclussion that the most hard groups are the youngest. They very easily loose patience, get tired and run they own path of doing things far away from what the teachers wanted them to learn. But this is not always bad. After all they came here to have some fun and as long as they try some programming, even not according to the teacher‘s plan, i think it‘s good.

The 12-years-old were the most quite and concentrated on what teacher told them to do. Isn‘t it the effect of education system over years that teaches this passiveness and taking what teacher says for granted and staying away from self-exploratory? I hope this is not the case. Thanks to such events children have chance to try their own ideas and noone shold tell them to wander away from the plan.

Seeing a few different lectures like Lego Mindstorms, 3D printers, Scratch, App Inventory  i must say the teachers did realy good job, even if some have mostly technical background and luck experience in working witch children (me included) the way they leaded was very professional.

I know from a back-stage conversations with ordanizers that the whole project of devoxx4kids started as a group of friends who wanted to make a workshop for their own kids last year but since then the event got so much interest that people from other cities than warsaw came in touch with them to organize an event in their town.

I though myself to start it in Lodz. Afer some observations this year and with some help from organizers in Warsaw i think the project has chance to succeed.
Stay tuned..

And some movies:

Wednesday, May 20, 2015

Atmosphere Conference, Cracow 18-19 May 2015

This is my brain dump from Atmosphere Conference in Cracow 18-19 May 2015
Only most important terms to memorize and google about.

JAMIE WINSORBuilding And Releasing A Massively Multiplayer Online Game A nice talk about caveats of game server internals and road of choosing right technology for online platform which is Erlang (elixir to be  precise), a video of the presentation is online

DUNCAN DAVIDSONWhat we've learned from writing dozens of polyglot micro services
Wunderlist jungle of polyglot micro services
Json over Http2
Json over amqp
Spot instances aws

MILEN DYANKOVMicroservices and Modularity or the difference between treatment and cure!
Great presentation of refactoring Oracle demo EJB application into modular according to Uncle Bob`s "clean architecture" principles


PIOTR STAPP, MARCIN PRZEKOPDevOps in mBank - lesson learned 
Wcf connection (client-server)
Nuget CI
Splunk for log mgmt.


LEV POPOVService Operations Evolution at Spotify

KONRAD MALAWSKINeed for Async: In pursuit of scalable internet-scale applications
Concurrent 《 lock free 《 block free
CAS compare and set Blocked Queue lock free
ConcurrentLinkedQueue wait free

C10k 10000 concurrent connection problem of scalability - epool function in linux

Distributed systems:
- latency enhancement by backup requests
- avoided duplicate load by combined requests

 ANDRZEJ GRZESIKThe path to repeatable builds


TOMASZ NURKIEWICZHystrix – managing failures in distributed systems

Hystrix dashboard
Turbine for multiple instances monitoring and aggregating to single stream

KASZ SZYDLOEnabling Continuous Delivery    Book worth reading:

MARCIN BAZYDLOStrongly Typed Logs - Journeyman's story 

Kafka, Redis + ELS stack
Semantic logs
Elastic search depends on Lucene schema, version is important in the logs cause db supports many versions of the app throught lifespan
Zipco for distributed request tracing
Emaze - presentation editor

SETH VARGOThe 10 Myths of DevOps 
Google's April Fool's Day spot: Google Actual Cloud