Overview of Apache Solr
Apache Solr is an application based on J2EE and uses Lucene libraries internally to provide user-friendly search as well as to generate the 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 the navigation and search features of internet sites.
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What are the features of Apache Solr?Apache Solr has the following features -
- Highly Scalable and Fault Tolerant
- Easy Monitoring
- Comprehensive Administration Interfaces
- Optimized for High Volume Traffic
- Advanced Full-Text Search Capabilities
- Extensible Plugin Architecture
- Near Real-Time Indexing
- Flexible and Adaptable with easy configuration
- Standards-Based Open Interfaces - XML, JSON and HTTP
What is the architecture of Apache Solr?
- Request handlers processed request Handler -The requests made to Solr. The requests might be index update requests or query requests.
- Search Component - Search component is a feature of search provided by Solr. It might be a query, spell checking, hit highlighting, etc.
- Query Parser - The parser parses the queries that we pass to Solr and verifies for syntactical errors.
- Response Writer - Response writer generates the formatted output for user queries.
- Analyzer/Tokenizer - In Solr, an analyzer examines the text of fields and generates a Token Stream.
- Update Request Processor - Update Request Processor is used for modifications such as adding a field, dropping in a field, etc.
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Apache Solr SecurityApache 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 AWSYou can install Apache Solr on AWS EC2 instance by doing the following steps -
Connect to your instance, using SSH.
ssh -i /path/to/key-pair.pem email@example.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 18.104.22.168 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-1:9983
Inspect and verify Solr nodes from browser
Go to-http://ec2-121-3-2-1.us-east-2.compute.amazonaws.com:8983/solr (solr-node- 1:8983/solr)