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Elasticsearch And Ruby [RuPy2012]
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Elasticsearch And Ruby [RuPy2012]


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  • 1. ElasticsearchAnd RubyKarel Minařík
  • 2. Elasticsearch and Ruby
  • 3. {elasticsearch in a nutshell}Built on top of Apache LuceneSearching and analyzing big dataScalabilityREST API, JSON DSLGreat fit for dynamic languages and web-oriented workflows / architectures Elasticsearch and Ruby
  • 4. { } Elasticsearch and Ruby
  • 5. { } It all started in this gist… (< 200 LOC) Elasticsearch and Ruby
  • 6. { } Elasticsearch and Ruby
  • 7. Example class Results include Enumerable attr_reader :query, :curl, :time, :total, :results, :facets def initialize(search) response = JSON.parse("http://localhost:9200/#{search.indices}/_search", search.to_json) ) @query = search.to_json @curl = %Q|curl -X POST "http://localhost:9200/#{search.indices}/_search?pretty" -d #{@query}| @time = response[took] @total = response[hits][total] @results = response[hits][hits] @facets = response[facets] end def each(&block) @results.each(&block) end end Elasticsearch plays nicely with Ruby… Elasticsearch and Ruby
  • 8. elasticsearch’s Query DSLcurl  -­‐X  POST  "http://localhost:9200/articles/_search?pretty=true"  -­‐d  {    "query"  :  {        "filtered"  :  {            "filter"  :  {                "range"  :  {                    "date"  :  {                        "from"  :  "2012-­‐01-­‐01",                        "to"      :  "2012-­‐12-­‐31"                    }                }            },            "query"  :  {                "bool"  :  {                    "must"  :  {                        "terms"  :  {                            "tags"  :  [  "ruby",  "python"  ]                        }                    },                    "must"  :  {                        "match"  :  {                            "title"  :  {                                "query"  :  "conference",                                "boost"  :  10.0                            }                        }                    }                }            }        }    }}
  • 9. Example do query do boolean do must { terms :tags, [ruby, python] } must { string published_on:[2011-01-01 TO 2011-01-02] } end end end Elasticsearch and Ruby
  • 10. Example tags_query = lambda do |boolean| boolean.must { terms :tags, [ruby, python] } end published_on_query = lambda do |boolean| boolean.must { string published_on:[2011-01-01 TO 2011-01-02] } end do query { boolean &tags_query } end do query do boolean &tags_query boolean &published_on_query end end Elasticsearch and Ruby
  • 11. Example search = articles do query do string title:T* end filter :terms, tags: [ruby] facet tags, terms: tags sort { by :title, desc } end search = search.query { string(title:T*) } search.filter :terms, :tags => [ruby] search.facet(tags) { terms :tags } search.sort { by :title, desc } Elasticsearch and Ruby
  • 12. TEH PROBLEM Designing the Tire library as domain-specific language, from the higher level, and consequently doing a lot of mistakes in the lower levels. ‣ Class level settings (Tire.configure); cannot connect to two elasticsearch clusters in one codebase ‣ Inconsistent access (methods vs Hashes) ‣ Not enough abstraction and separation of concerns Elasticsearch and Ruby
  • 13. ”Blocks with arguments” (alternative DSL syntax) do query do text :name, params[:q] end do |search| search.query do |query| query.text :name, params[:q] endend Elasticsearch and Ruby
  • 14. The Git(Hub) (r)evolution‣ Lots of contributions... but less feedback‣ Many contributions focus on specific use case‣ Many contributions don’t take the bigger picture and codebase conventions into account‣ Almost every patch needs to be processed, polished, amended‣ Maintainer: lots of curation, less development — even on this small scale (2K LOC, 7K LOT)‣ Contributors very eager to code, but a bit afraid to talk
  • 15. Tire’s Ruby on Rails integration$  rails  new  myapp        -­‐m  "­‐application-­‐template.rb"‣ Generate a fully working Rails application with a single command‣ Downloads elasticsearch if not running, creates the application, commits every step, seeds the example data, launches the application on a free port, …‣ Tire::Results::Item fully compatible with Rails view / URL helpers‣ Any ActiveModel compatible OxM supported‣ Rake task for importing data (using pagination libraries) Elasticsearch and Ruby
  • 16. Rails integration baked in‣ No proper separation of concerns / layers‣ People expect everything to be as easy as that‣ Tire::Results::Item baked in, not opt-in, masquerades as models‣ People consider ActiveRecord the only OxM in the world Elasticsearch and Ruby
  • 17. …Persistence extensionRails extensionsActiveRecord extensionsActiveModel integrationThe Ruby DSLBase library (HTTP, JSON, API)
  • 18. https://rubygems.org
  • 19. “Search”class Rubygem < ActiveRecord::Base # ... def conditions = <<-SQL versions.indexed and (upper(name) like upper(:query) or upper(translate(name, #{SPECIAL_CHARACTERS}, #{ *SPECIAL_CHARACTERS.length})) like upper(:query)) SQL where(conditions, {:query => "%#{query.strip}%"}). includes(:versions). by_downloads endend Elasticsearch and Ruby
  • 20. 123456 Adding search to an existing application
  • 21.
  • 22. “Hello Cloud” with Chef Server‣ Deploy on EC2 (or locally with Vagrant) from a “zero state”‣ 1 load balancer (HAproxy), 3 application servers (Thin+Nginx)‣ 1 database node (PostgreSQL, Redis)‣ 2 elasticsearch nodes‣ Install Ruby 1.9.3 via RVM‣ Clone the application from GitHub repository‣ init.d scripts and full configuration for every component‣ Restore data from backup (database dump) and import into search index‣ Monitor every part of the stack Elasticsearch and Ruby
  • 23. Thanks! d