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Apache Solr Search Patterns

You're reading from   Apache Solr Search Patterns Leverage the power of Apache Solr to power up your business by navigating your users to their data quickly and efficiently

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Product type Paperback
Published in Apr 2015
Publisher
ISBN-13 9781783981847
Length 316 pages
Edition 1st Edition
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Author (1):
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Jayant Kumar Jayant Kumar
Author Profile Icon Jayant Kumar
Jayant Kumar
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Table of Contents (12) Chapters Close

Preface 1. Solr Indexing Internals FREE CHAPTER 2. Customizing the Solr Scoring Algorithm 3. Solr Internals and Custom Queries 4. Solr for Big Data 5. Solr in E-commerce 6. Solr for Spatial Search 7. Using Solr in an Advertising System 8. AJAX Solr 9. SolrCloud 10. Text Tagging with Lucene FST Index

Advanced sharding with SolrCloud


Let's explore some of the advanced concepts of sharding, starting with shard splitting.

Shard splitting

Let us say that we have created a two-shard replica looking at the current number of queries per second for a system. In future, if the number of queries per second increases to, say, twice or thrice the current value, we will need to add more shards. Now, one way is to create a separate cloud with say four shards and re-index all the documents. This is possible if the cluster is small. If we are dealing with a 50 shard cluster with more than a billion documents, re-indexing of the complete set of documents again may be expensive. For such scenarios, SolrCloud has the concept of shard splitting.

In shard splitting, a shard is divided into two new shards on the same machine. All three shards, the old one and the two new ones, remain. We can check the sanity of the shards and then delete the existing shard. Let us see a practical implementation of the same.

Before...

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