On-call duty: prepare your team for unknown
In today’s world, the stability of IT infrastructure becomes more and more critical. The companies must respond to failures at any time of the day. For developers, this means on-call duty. Of course, to make it work, the developer must have enough skills to find the root cause and resolve the problem. In this article, […]
Anatomy of data node failures in Elasticsearch p. 2
In the previous article from the series about Elasticsearch clustering, we discussed the structure of data nodes responsible for storing the indices and indexed documents. Today we are going to use this knowledge to understand, what happens during the data node failures and planned restarts. We will also talk about possible mistakes that may lead […]
Anatomy of data nodes in Elasticsearch p. 1
This is the follow-up to my previous article about Elasticsearch clusters. Last time, we explored the world of master nodes. This time we will take a look at data nodes in Elasticsearch which store the actual data. This topic will be split into two parts. The part one describes indices: how they work, and what […]
Backpressure in reactive streams: a closer look
The backpressure is an important property of reactive streams. In simple words, it ensures us that the publishers do not produce new elements faster than we can process them. In this way, we avoid overloading our system. Over years, I noticed that many newcomers to the reactive world have trouble with understanding how backpressure affects […]
Anatomy of master nodes in Elasticsearch
Elasticsearch is a search engine written in Java, based on Apache Lucene library. As a distributed system, it creates certain challenges for reliability and availability of our data. But what actually happens if we misconfigure our cluster and how to make it safe? In this article, we will take a deeper look of how master […]
Barriers in LMAX Disruptor
LMAX Disruptor is a high performance inter-thread messaging library for Java. When the first version appeared several years ago, it made a lot of buzz on the Internet thanks to the innovative approach to concurrency. This article focuses on event consumers and barriers in LMAX Disruptor. Barriers are an important part of Disruptor architecture. They […]