Lednové setkání Pražské Czech Java User Group proběhne 27.1. od 19h v posluchárně S5 na Matematicko-fyzikální fakultě Karlovy Univerzity na Malostranském náměstí 25, Praha 1. Čekají nás prezentace Operating Cassandra NoSQL database across the globe (Jiří Horký) a Dynamic class loading (Jan Kolena). Sponzorem setkání je firma Avast Software. Vstup na akce CZJUGu je zdarma, a není třeba se předem registrovat. Pokud se chystáte přijít, dejte nám vědět formou hlasování v anketě na hlavní stránce portálu java.cz.

Operating Cassandra NoSQL database across the globe - experience from high rate production environment

The NoSQL databases have been gradually getting attention over the past years. Scalability, data replication and fault tolerance are common features of such products. However, the advantages do not come for free and one often must relax for other qualities such as true consistency. In this presentation we focus on Cassandra, a NoSQL database written in Java that is being massively used at Avast. We give an overview of the key concepts behind Cassandra and describe one of the Avast use cases and workload Cassandra is used for. We then focus on selected challenges that operating a multi terabyte database across the globe inevitably bring.

Jiří Horký - graduate of Mathematics and Physics Faculty of Charles University in Prague, currently works as Systems engineer in Avast Software with focus on massive distributed computing, Linux clusters consisting of hundred of nodes and PBs of storage.

Dynamic class loading

How can we load new classes during the runtime. Problems we are facing. Limitations of the solution and its alternatives.

Jan Kolena - graduate of University of West Bohemia, currently works as Java developer in Avast Software with focus on high performance Java backend applications and experienced in Android development.