Book Image

Scaling Big Data with Hadoop and Solr

By : Hrishikesh Vijay Karambelkar
Book Image

Scaling Big Data with Hadoop and Solr

By: Hrishikesh Vijay Karambelkar

Overview of this book

<p>As data grows exponentially day-by-day, extracting information becomes a tedious activity in itself. Technologies like Hadoop are trying to address some of the concerns, while Solr provides high-speed faceted search. Bringing these two technologies together is helping organizations resolve the problem of information extraction from Big Data by providing excellent distributed faceted search capabilities.</p> <p>Scaling Big Data with Hadoop and Solr is a step-by-step guide that helps you build high performance enterprise search engines while scaling data. Starting with the basics of Apache Hadoop and Solr, this book then dives into advanced topics of optimizing search with some interesting real-world use cases and sample Java code.</p> <p>Scaling Big Data with Hadoop and Solr starts by teaching you the basics of Big Data technologies including Hadoop and its ecosystem and Apache Solr. It explains the different approaches of scaling Big Data with Hadoop and Solr, with discussion regarding the applicability, benefits, and drawbacks of each approach. It then walks readers through how sharding and indexing can be performed on Big Data followed by the performance optimization of Big Data search. Finally, it covers some real-world use cases for Big Data scaling.</p> <p>With this book, you will learn everything you need to know to build a distributed enterprise search platform as well as how to optimize this search to a greater extent resulting in maximum utilization of available resources.</p>
Table of Contents (15 chapters)
Scaling Big Data with Hadoop and Solr
Credits
About the Author
About the Reviewer
www.PacktPub.com
Preface
Index

Using Solr 1045 patch – map-side indexing


The work for Solr-1045 patch started with a goal to achieve index generation/building using the Apache MapReduce task. Solr-1045 patch converts all the input records to a set of <key, value> pairs in each map task that runs on Hadoop. Further it goes on creating SolrInputDocument from the <key, value>, and later creating the Solr indexes. The following diagram depicts this process:

Reduce tasks can be used to perform deduplication of indexes, and merge them together if required. Although merge index seems to be an interesting feature, it is actually a costly affair in terms of processing, and you will not find many implementations with merge index functionality. Once the indexes are created, you can load them on your Solr instance and use them for searching.

You can download this particular patch from https://issues.apache.org/jira/browse/SOLR-1045, and patch your Solr instance. To apply a patch to your Solr instance, you need to first...