Book Image

Monitoring Elasticsearch

By : Dan Noble, Pulkit Agrawal, Mahmoud Lababidi
Book Image

Monitoring Elasticsearch

By: Dan Noble, Pulkit Agrawal, Mahmoud Lababidi

Overview of this book

ElasticSearch is a distributed search server similar to Apache Solr with a focus on large datasets, a schema-less setup, and high availability. This schema-free architecture allows ElasticSearch to index and search unstructured content, making it perfectly suited for both small projects and large big data warehouses with petabytes of unstructured data. This book is your toolkit to teach you how to keep your cluster in good health, and show you how to diagnose and treat unexpected issues along the way. You will start by getting introduced to ElasticSearch, and look at some common performance issues that pop up when using the system. You will then see how to install and configure ElasticSearch and the ElasticSearch monitoring plugins. Then, you will proceed to install and use the Marvel dashboard to monitor ElasticSearch. You will find out how to troubleshoot some of the common performance and reliability issues that come up when using ElasticSearch. Finally, you will analyze your cluster’s historical performance, and get to know how to get to the bottom of and recover from system failures. This book will guide you through several monitoring tools, and utilizes real-world cases and dilemmas faced when using ElasticSearch, showing you how to solve them simply, quickly, and cleanly.
Table of Contents (15 chapters)
Monitoring Elasticsearch
About the Author
About the Reviewers


This chapter looked into how to diagnose node failures, determine the root cause of the problem, and apply corrective action. Some key things we learned are:

  • Many errors, from shard failures to slow query performance, are caused by OutOfMemoryError exceptions

  • Running out of disk space on one node can cause other nodes to run out of disk space as well when shards are reallocated

  • Running Elasticsearch alongside other services that require a lot of memory can result in the operating system killing Elasticsearch to free up memory

The next chapter will talk about Elasticsearch 5.0, the next major release of the platform, and it will give you an overview of the various new monitoring tools that will accompany the Elasticsearch 5.0 release.