Book Image

Apache Solr 3.1 Cookbook

By : Rafał Kuć
Book Image

Apache Solr 3.1 Cookbook

By: Rafał Kuć

Overview of this book

<p>Apache Solr is a fast, scalable, modern, open source, and easy-to-use search engine. It allows you to develop a professional search engine for your ecommerce site, web application, or back office software. Setting up Solr is easy, but configuring it to get the most out of your site is the difficult bit.</p> <p>The Solr 3.1 Cookbook will make your everyday work easier by using real-life examples that show you how to deal with the most common problems that can arise while using the Apache Solr search engine. Why waste your time searching the Internet for solutions when you can have all the answers in one place?</p> <p>This cookbook will show you how to get the most out of your search engine. Each chapter covers a different aspect of working with Solr from analyzing your text data through querying, performance improvement, and developing your own modules. The practical recipes will help you to quickly solve common problems with data analysis, show you how to use faceting to collect data and to speed up the performance of Solr. You will learn about functionalities that most newbies are unaware of, such as sorting results by a function value, highlighting matched words, and computing statistics to make your work with Solr easy and stress free.</p>
Table of Contents (17 chapters)
Apache Solr 3.1 Cookbook
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

How to deal with garbage collection running too long


As with all the applications running inside the Java virtual machine, Solr can also have problems with garbage collection running too long. You may never encounter this kind of a problem, or you may suffer from it and don't know what is actually happening. This recipe will show you how to deal with garbage collection running too long.

How to do it...

For the purpose of this recipe, I assumed that we have a machine with multiple cores (or multiple processor units), Java 6, and run Solr with the following command:

java –Xms256M –Xmx2048 –jar start.jar

After running for a longer period of time, you notice that Solr starts to hang for short periods of time and doesn't respond during that time. Actually, Jetty doesn't respond either. After that, everything goes back to normal for some time and then it happens again. This usually means that we have a problem with garbage collection running too long.

What can we do about that? Let's modify the Solr...