Nov 10, 2021Bloom Filter: come memorizzare 1 Milione di stringhe in meno di 2MB?In questo articolo ci divertiremo con il Bloom Filter, una struttura dati semplice ed elegante che permette (in alcuni casi) di memorizzare molti dati occupando pochissima memoria. Come vedremo nell’esempio sarà possibile memorizzare 1 Milione di stringhe occupando mendo di 2MB, tutto questo indipendentemente dalla loro lunghezza. Il Bloom Filter…Bloom Filter4 min readBloom Filter4 min read
Dec 27, 2020Having fun with Immutable Data Structures: Implementing a Markov Chain in ScalaIn this article, I will describe a simple implementation of a Markov chain using Scala. In particular, I will show how to build a purely functional data structure, without the use of any mutable state or variables. On the way, I will introduce the usage of the builder design pattern…Scala4 min readScala4 min read
Dec 26, 2018Hpc with scala and akka ActorsIn this brief article I will show you how to accelerate the computation of the Mandelbrot set using akka actors in scala (running on aws with 16 vCPU). This is a classic hello-world in parallel programming. I reduced the completion time to 2 seconds, starting from the 24 seconds needed…Scala5 min readScala5 min read
May 23, 2018Kafka Connect: Elasticsearch source connectorIn this story, I will present the elasticsearch source plugin. What are connectors and why I need them? Kafka connectors are plugin designed to transfer data between a Kafka cluster and external systems (others queue systems, relational databases, Hadoop, etc…). You can find a lot of connectors already developed (a list can be found on the confluent web…Elasticsearch2 min readElasticsearch2 min read
Published inBitcoin Analytics with ELK (Elasticsearch, Logstash, Kibana)·Apr 26, 2018Bitcoin Analytics with ELK (Elasticsearch, Logstash, Kibana)In this (first) post, I will show you how to study the impact of news on bitcoin’s change price. We will use the ELK stack (Elasticsearch, Logstash and Kibana) to collect, store and visualize the bitcoin’s price changes and some of the most relevant world news, but don’t be scared…Elasticsearch2 min readElasticsearch2 min read
