Posts by Jaromir Hamala

I'm a developer at Hazelcast®. I wrote my first line of code when I was 7 years old. Since than I was always interested in "How this system works under the hood?" I like pushing systems towards limits, brushing my skills by exploring HotSpot source code, contributing to open source projects and arguing about development over a pint of beer.

Hazelcast Jet Tutorial: Building Custom JDBC Sinks

Part I: Intro Hazelcast Jet supports writing into a number of 3rd party systems, including HDFS, Apache Kafka and others. But what if you want to write into your own system which is not supported by Jet out-of-the-box? Starting with…

Hazelcast IMDG 3.9 Is Out!

We just released Hazelcast IMDG 3.9. It’s a release packed with new features, improvements and optimizations. Let me introduce you to a few of them: User Code Deployment from Clients In Hazelcast IMDG 3.8, we introduced an option for automatic…

Hazelcast IMDG 3.9 EA is available

Hello Hazelcasters! First off I would like to introduce myself – I started contributing to the project about 4 years ago, later on I joined as a performance engineer and in last 2 years I led the core engineering team.…

The simplest way to integrate Kryo with Hazelcast

Hazelcast offers a bunch of strategies to serialize your domain objects. You can start with simple Java Serialization and change the the strategy when it turns out to be performance bottleneck. It’s also simple to plug-in your own serialization. Kryo…

Hazelcast on AWS – Kernel Bug

The other day we discovered a bug in older Linux kernel versions and I thought you would like to know about it. Summary Use Linux kernel 3.19+ when running Hazelcast on AWS. TCP connections can get stuck with older kernel…