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 […]

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 […]

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 […]