Monty-Hall problem

— 1 min read

This is totally random write-up and it made it here because it inspired post about Java Random number generation. Here is how it goes…

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Messaging system latencies, part 1: Apache Kafka

— 5 min read


Most developers I talk to about Kafka agree on a catchphrase “Kafka is designed for throughput”. That’s fair and you can find plenty of benchmarks that show 700k/s throughput for single producer without replication. But does that mean we should discard Kafka when talking about low latency messaging?

After quick googling I found this outdated SO question. That question is very old and includes very old version of Kafka (0.7.2 whereas current version is 2.0.0) and also this article states that very decent latencies (2-3ms 99 percentile) are achievable. Having such controversial info is not enough to make final decision so I decided to create a little benchmark myself, to finally conclude whether Kafka is good for low-latency applications.

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Introduction to Java coroutines

— 10 min read


Many times I find an ExecutorService with 400 threads in Java code and I always got that’s-not-ok feeling of that. This is usually introduced as necessary evil to retain application responsiveness while being blocked by downstream. However there is another way of achieving responsiveness, which is couroutines (alternatively known also as green threads and non-blocking threads in another languages). Java doesn’t support coroutines at language level, so for this example we will use almost exclusive Java implementation of coroutines - Quasar.

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Hello World!

— 1 min read

Well, I’ve finally made it! Every big boy must have a blog they say, and now I have one as well. Let’s see how it goes…