Overview of Apache Solr
Apache Solr is an application based on J2EE that uses Lucene libraries internally to provide user-friendly search and generate indexes. Solr is scalable, highly reliable, and fault-tolerant, providing replication, distributed indexing and load-balanced querying, recovery and automated failover, centralized configuration, and more. Solr powers websites' navigation and search features.
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What are the features of Apache Solr?
Apache Solr has the following features --
Highly Scalable and Fault Tolerant
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Easy Monitoring
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Comprehensive Administration Interfaces
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Optimized for High Volume Traffic
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Advanced Full-Text Search Capabilities
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Extensible Plugin Architecture
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Near Real-Time Indexing
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Flexible and Adaptable with easy configuration
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Standards-Based Open Interfaces - XML, JSON and HTTP
What is the architecture of Apache Solr?
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Request handlers processed request Handler -The requests made to Solr. The requests might be index update requests or query requests.
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Search Component—A search component is a feature provided by Solr. It might include a query, spell checking, hit highlighting, etc.
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Query Parser - The parser parses the queries we pass to Solr and verifies for syntactical errors.
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Response Writer - The response writer generates the formatted output for user queries.
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Analyzer/Tokenizer - In Solr, an analyzer examines the text of fields and generates a Token Stream.
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Update Request Processor—The update Request Processor is used for modifications such as adding or dropping a field.
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Apache Solr Security
Apache Solr can be secured by following methods - Enable Plugins with security.json Using security.json with Solr.- In Standalone Mode
- In SolrCloud Mode
- Enabling a Plugin
- Available Authentication Plugins
- Loading a Custom Plugin
- Available Authorization Plugins
Installation of Apache Solr on AWS
You can install Apache Solr on an AWS EC2 instance by doing the following steps -Connect to your instance using SSH.
ssh -i /path/to/key-pair.pem ec2-user@ec2-196-41-100-1.compute-1.amazonaws.com
Configure Java and download Solr
# verify default java version packaged with AWS instances is 1.7
$ java -version
$ sudo yum install java-1.8.0
$ sudo /usr/sbin/alternatives --config java
# select jdk-1.8
# verify default java version to java-1.8
$ java -version
# download desired version of Solr
$ wget http://archive.apache.org/dist/lucene/solr/7.2.0/solr-7.2.0.tgz
# untar
$ tar -zxvf solr-7.2.0.tgz
# set SOLR_HOME
$ export SOLR_HOME=$PWD/solr-7.2.0
# put the env variable in .bashrc
# vim ~/.bashrc
export SOLR_HOME=/home/ec2-user/solr-7.2.0
Change public DNS to hostname
Edit /etc/hosts, and add entries:
$ sudo vim /etc/hosts
54.3.2.1 solr-node-1
Configure Solr
$ cd $SOLR_HOME 1. # start Solr node on 8983 and connect to ZooKeeper running on first node $ bin/solr start -c -p 8983 -h solr-node-2 -z solr-node-1:9983Inspect and verify Solr nodes from the browser
Go to-http://ec2-121-3-2-1.us-east-2.compute.amazonaws.com:8983/solr (solr-node-
1:8983/solr)
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