Elastic search is a mirror db with indexes of your existing DB, which is seachable trough JSON API. In order to perform search you will need to have the data synced between your DB and ElasticSerach. This can be done via rivers to pull data from your application or to push data to your ES node via _bulk operations.
But let’s start from beginning:
1.Download Elastic Search deb
cd /usr/share/elasticsearch # To install Marvel inside development enviroment sudo bin/plugin -i elasticsearch/marvel/latest # In same directory run ES bin/elasticsearch -d #Check if it's working localhost:9200
Keeping data in sync
The simple way:
class Article include Elasticsearch::Model include Elasticsearch::Model::Callbacks end More complex way would be: # 1. Bind callbacks after_commit on: [:create] do index_document if self.published? end after_commit on: [:update] do update_document if self.published? end after_commit on: [:destroy] do delete_document if self.published? end
Using async commands – a way to go
Please refer to https://github.com/elasticsearch/elasticsearch-rails/tree/master/elasticsearch- model
JDBC plugin for Elasticsearch
The Java Database Connection (JDBC) plugin allows to fetch data from JDBC sources for indexing into Elasticsearch.
You can setup a script that pulls data from MySQL into ES. You will have to write custom SQL queries to do so.
#Check Marvel plugin http://any-server-in-cluster:9200/_plugin/marvel/.
We recommend installing the Java 8 update 20 or later, or Java 7 update 55 or later. Previous versions of Java 7 are known to have bugs that can cause index corruption and data loss.