Setting Up Distributed Infinispan Cache with Hibernate and Spring

February 17, 2016

A pretty typical setup – spring/hibernate application that requires a distributed cache. But it turns out not so trivial to setup. You obviously need cache. There are options to do that with EhCache, Hazelcast, Infinispan, memcached, Redis, AWS’s elasticache and some others. However, EhCache supports only replicated and not distributed cache, and Hazelcast does not […]

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General Performance Tips

December 28, 2015

Performance is a mystical thing our systems must have. But as with most things in software engineering, there is no clearly defined set of steps that have to be followed in order to have a performant systems. It depends on the architecture, on the network, on the algorithms, on the domain problem, on the chosen […]

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AWS “Noisiness”

May 14, 2015
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You may be familiar with the “noisy neighbour” problem with virtualization – someone else’s instances on the same physical machine “steals” CPU from your instance. I won’t be giving clues how to solve the issue (quick & dirty – by terminating your instance and letting it be spawned on another physical machine), and instead I’ll […]

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Not All Optimization Is Premature

November 27, 2012

The other day the reddit community discarded my advice for switching from text-based to binary serialization formats. It was labeled “premature optimization”. I’ll zoom out of the particular case, and discuss why not all optimization is premature. Everyone has heard of Donald Knuth’s phrase “[..] premature optimization is the root of all evil”. And as […]

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A Tip For Properly Utilizing Hibernate 2nd Level Cache

October 27, 2012

Your entity is @Cacheable, your cache is configured properly, but still, loading an entity produces a lot of sql queries. I noticed that the other day, and realized something: hibernate does not cache collection mappings. So if you have @OneToMany, they are fetched from the database. Which is a bit counter-intuitive, because my assumption was […]

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Replacing a JSON Message Converter With MessagePack

April 17, 2012

You may be using JSON to transfer data (we were using it in our message queue). While this is good, it has the only benefit of being human-readable. If you don’t care about readability, you’d probably want to use a more efficient serialization mechanism. Multiple options exist: protobuf, MessagePack, protostuff, java serialization. The easiest of […]

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