Solr is the popular, blazing fast open Source Enterprise search platform from the Apache LuceneTM project. Its major features include powerful full-text search, hit highlighting, faceted search, near real-time indexing, dynamic clustering, database integration, rich document (e.g., Word, PDF) handling, and geospatial search. Solr is highly reliable, scalable and fault tolerant, providing distributed indexing, replication and load-balanced querying, automated failover and recovery, centralized configuration and more. Solr powers the search and navigation features of many of the world's largest internet sites like (Aol, Yahoo, Buy.com, Cnet, CitySearch, Netflix, Zappos, Stubhub!, digg, eTrade, Disney, Apple, NASA and MTV).

1. www.edureka.co/apache-solr
New-Age Search through Apache Solr
View Apache Solr course details at www.edureka.co/apache-solr
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LIVE Online Class
Class Recording in LMS
24/7 Post Class Support
Module Wise Quiz
Project Work
Verifiable Certificate
www.edureka.co/apache-solr
How it Works?

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Objectives
At the end of this module, you will be able to understand:
The need for search engine for enterprise grade applications
The objectives & challenges of search engine
How is Indexing & Searching Handled in Lucene
Solr and its Architecture
Near Real Time Search with Solr
Leveraging Solr Capabilities with Hadoop
Solr with YARN
About job opportunity for Solr Developers

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Why Do I Need Search Engines ?

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Search Engine: Why do I need them?
1. Text Based Search
2. Filter
3. Documents
1
2
3

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Search Engine – What it should be?
If you need a storage engine to search records / documents using text-based keywords it should support following
features:
1. Should be optimized for faster text searches
2. Should have flexible schema
3. Should support sorting of documents
4. Web Scale - Should be optimized for reads
5. Should be document oriented

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Cleartrip Spatial Search

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What is Lucene ?
 Lucene is a powerful Java search library that lets you easily add search or Information Retrieval (IR) to applications
 Used by LinkedIn, Twitter, … and many more (see http://wiki.apache.org/lucene-java/PoweredBy )
 Scalable & High-performance Indexing
 Powerful, Accurate and Efficient Search Algorithms
 Cross-Platform Solution
» Open Source & 100% pure Java
» Implementations in other programming languages available that are index-compatible
Doug Cutting “Creator”

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Indexing – How it works?
I like edureka courses
Edureka teaches big
data courses
Edureka helps learn new
technologies easily
Document - 1 (“D1”) Document - 2 (“D2”) Document - 3 (“D3”)
“edureka” = {D1, D2, D3}
“courses” = {D1, D2}
“teaches” = {D2}
“big” = {D2}
“data” = {D2}
“helps” = {D3}
“edureka”

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Lucene – Writing to Index
Field
Field
Field
Field
Analyzer IndexWriter Directory
Document
Classes used when indexing documents with Lucene

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Lucene – Searching In Index
QueryParser
Analyzer
IndexSearcherExpression
Query object
Text fragments
 Query Parser translates a textual expression from the end into an arbitrarily complex query for searching

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Solr is an open source enterprise search server / web application
Solr Uses the Lucene Search Library and extends it
Solr exposes lucene Java API’s as RESTful services
You put documents in it (called "indexing") via XML, JSON, CSV or binary over HTTP
You query it via HTTP GET and receive XML, JSON, CSV or binary results
What is Solr ?

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Advanced Full-Text Search Capabilities
Optimized for High Volume Web Traffic
Standards Based Open Interfaces - XML, JSON and HTTP
Comprehensive HTML Administration Interfaces
Server statistics exposed over JMX for monitoring
Near Real-time indexing and Adaptable with XML Configuration
Linearly scalable, auto index replication, auto, Extensible Plugin Architecture
Solr: Key Features

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Solr: Architecture

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Request
Handler
Query Parser
Response
Writer
Index
qt: selects a RequestHandler for a query using/select(by default, the DisMaxRequestHandler is used)
defType : selects a query parser for the query
(by default, uses whatever has been
configured for the RequestHandler)
qf: selects which fields to query
in the index(by default, all fields
are required)
wt: selects a response writer
for formatting the query
response
fq: filters query by applying an additional query to
the initial query’s results, caches the results
Rows:
specifies the
number of rows
to be displayed
at one time
Start: specifies an
offset(by default 0)
into the query results
where the returned
response should begin
Solr: Search Process

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Near Real-Time Search
 Near Real Time (NRT) search means that documents are available for search almost immediately after being
indexed: additions and updates to documents are seen in 'near' real time
http://localhost:8983/solr/update?stream.body=<add><doc><fieldname="id">testdoc</field></doc></add>&co
mmit=true

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Real-Time Get
 The realtime get feature allows retrieval (by unique-key) of the latest version of any documents without the
associated cost of reopening a searcher
 This is primarily useful when using Solr as a NoSQL data store and not just a search index

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Leveraging Solr Capabilities with Hadoop
 Solr provides us fast, efficient, powerful full-text search and near real-time indexing and SolrCloud is flexible
distributed search and indexing, and will do things like automatic fail over etc.
 Hence its very suitable as NoSQL replacement for traditional databases in many situations, especially when the size of
the data exceeds what is reasonable with a typical RDBMS
 We can do scalable indexing using Hadoop MapReduce or PIG job and then load the indexed data in Solr
 In all the major Hadoop distribution like Cloudera, Hortonworks, MapR you can integrate Solr easily

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PDF
Word
HTML
.
.
.
Raw Files
Lucene
SolR SolR SolR
Query Response
Search
Web App
MapReduce
Indexing Job
Raw Files Indexed
HDFS
(Hadoop Distributed File System)
Scalable Indexing
Input Data

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Solr with YARN

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Job trends for Apache Solr

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Disclaimer
Criteria and guidelines mentioned in this presentation may change. Please visit our website for
latest and additional information on Apache Solr

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Course Topics
 Module 5
» Solr Searching
 Module 6
» Solr Extended Features
 Module 7
» Solr Cloud & Administration
 Module 8
» Final Project
 Module 1
» Introduction to Apache Lucene
 Module 2
» Exploring Lucene
 Module 3
» Introduction to Apache Solr
 Module 4
» Solr Indexing