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

System configuration

Elasticsearch configuration may lead to a number of performance and reliability issues, as mentioned in Chapter 2, Installation and the Requirements for Elasticsearch. A quick reminder that the most important configuration changes to make to your cluster are as follows:

  • Ensuring that the Elasticsearch heap size (ES_HEAP) is set to 1/2 of available system memory, but does not exceed 31 GB. Set this value in /etc/defaults/elasticsearch

  • Disabling memory swapping

  • Locking the Elasticsearch address space into memory by setting bootstrap.mlockall: true in elasticsearch.yml

Refer to Chapter 2, Installation and the Requirements for Elasticsearch, for more detailed instructions on how to set these values.