YaCy is a distributed search engine, free of charge, built on the principles of peer-to-peer networks. The source code is written in Java, distributed on several hundred computers, the so-called YaCy peers. Each YaCy-peer crosses the internet, analyzes and indexes the results, and saves indexed results into a common database (the so-called “index”), which is shared with other YaCy...

A string of data or an array is a structure that contains multiple values ​​of the same type of data. The length of a data string is set at the creation of the array and will be fixed over its entire existence. It is often convenient to store multiple values ​​in a variable. Such a variable is called a matrix, and the individual values ​​are called matrix elements. How to declare an array? Let us...

Cassandra is a free and open source database management system that can be used to manage large amounts of data across multiple servers. It is trusted, clustered and specially designed to handle enormous amounts of structured data. Cassandra also supports replication and multi-replication data center for redundancy, fail over, and disaster recovery. The Cassandra database is one of the most...

In Linux distributions there are two file systems that allow you to create a file system based on a part of RAM and that can be mounted and used as a normal directory, writing or read from any regular partition. But since writing/reading is made directly from RAM, the speed will be higher, even a few times higher than a normal SSD. What is a RAM disk? Basically, a RAM-based file system is...

Linux users are stuck in a dilemma: Although the freedom to use open source software is great and highly appreciated, the operating system has only a small percentage of the regular users market (I do not count servers, which in a high proportion, use Linux), which makes certain large-scale industrial programs in Windows (for example, Adobe Photoshop) not being ported by the developer on Linux...

RAID, short for Redundant Array of Independent Disks, is an HDD configuration designed to provide shorter access times and system security in case of hardware errors. The RAID concept combines multiple hard disk drives into one logical disk drive with higher storage capacity, using a hardware component or software application. Hardware solutions are designed to present the system to which they...

Apache Hadoop is a framework that facilitates the processing of large and extensive data sets on multiple computers using a simple programming model: map/reduce paradigm. Instead of relying on high-availability hardware, the framework itself is designed to detect application-level errors. It is an open source project under the Apache Foundation, with a global community of contributors, the most...

The article aims to present a series of general notions about Kafka and the role this system plays in the Big Data ecosystem. One of Big Data’s biggest challenges is the data analysis part. But to meet this challenge, it is essential to focus our attention on how we manage to collect this data? The Apache Kafka system comes into our aid. Kafka is distinguished as an open-source project of...

SNMP is a communications protocol that allows remote monitoring and remote management of devices running on an Ethernet network.  Remote management requires: 1. A communication protocol (SNMP protocol); 2. Management Information Bases, MIB. 3. An SNMP agent. 4. An SNMP Manager. The SNMP protocol runs at the application level of the TCP/IP protocols stack and is used by managers and agents to...

We usually get this error when we try to access a web page and the first web server is not receiving a response from another web server along with the route on which the data passes. Often this signifies a problem for the website and most of the time we can’t do anything about it, but there are exceptions when the problem can be from the network configuration or our own device. A 502 Bad...