slides/2013-05-06/elasticsearch/presentazione.html

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		<title>Elastic Search</title>

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				<section>
					<h1>Elastic Search</h1>
					<h3></h3>
				</section>

				<section>
					<h2>Chi sono</h2>
					<p><img src="img/io.jpg" alt="Daniele Palombo" style="width:200px;"></p>
					<p>Daniele Palombo -> tw: <a href="https://twitter.com/ksemuldie">@ksemuldie</a>, gh: <a href="https://github.com/danielePalombo">DanielePalombo</a></p>
					<p><br></p>
					<p> E-Business</p>
					<p>Appassionato di sviluppo Agile e tecniche di programmazione</p>
				</section>

				<section data-state="alert">
					<h2>Premessa</h2>
					<p>ElasticSearch si ma solo in teoria</p>
					<img src="img/teoria.jpg"/>
				</section>

				<section>
				        <img src="img/chi.jpg"/>
					<h2>Chi è ElasticSearch?</h2>
					<p><em>Distributed , RESTful, free/open source , search server</em></p>
				</section>

				<section>
                                        <h2>Search Server</h2>
                                        <p>I Search server sono dei servizi per ottimizzare l'indicizzazione di testi</p>
                                        <ul>
                                                <li>Sopperiscono alle mancanze delle ricerche fulltext dei database classici </li>
                                                <li>Possono anche essere usati in alternativa a database classici</li>
                                                <li>Ne esistono ormai tantissimi <em>Lucene</em> <em>Solr</em> <em>MSS</em></li>
						<li>ElasticSearch utilizza Lucene come shard</li>
					</ul>
                                </section>

				<section>
				<h2>Distributed</h2>
				<p>Shard & Replica</p>
				</section>
				<section>
					<h2>Shard</h2>
					<ul>
						<li>È una singola istanza di Lucene</li>
						<li>Un indice è composto da più shard(default 5)</li>
						<li>Gli shard possono essere distribuiti su più server</li>
					</ul>
				</section>

				<section>
					<h2>Replica</h2>
					<ul>
						<li>I replica sono le copie di backup del dato </li>
						<li>Serve a garantire l'integrità dei dati anche in caso di disservizio di una o più macchine</li> 
					</ul>
				</section>

				<section>
					<h2>RESTful</h2>
					<p>ElasticSearch a differenza di altri searchengine offre un'interfaccia di accesso HTTP che sfrutta i 4 VERB del protocollo (GET , PUT , DELETE , POST) garantendo quindi un'accesso da qualsiasi linguagggio di programmazione tramite API e un semplice debugging (tramite http , curl ecc...)</p>
				</section>

				<section>
					<h2>Opensource</h2>
					<p>La scelta migliore !!!!!</p>
				</section>

				<section>
					<h2>Installazione</h2>
					<img src="img/installazione.jpg" style="width: 300px"/>
					<pre><code>
cd ~
sudo apt-get update
sudo apt-get install openjdk-7-jre-headless -y
wget https://download.elasticsearch.org/elasticsearch/elasticsearch/elasticsearch-0.20.6.deb
sudo dpkg -i elasticsearch-0.20.6.deb
sudo service elasticsearch start
					</code></pre>
				</section>


				<section>
					<h2>Glossario</h2>
					<ul>
						<li><b>index</b> <em>corrisponde ai database nei db sql</em></li>
						<li><b>term</b> <em>indica un termine di ricerca esatto</em></li>
						<li><b>text</b> <em>indica un testo non strutturato</em></li>
						<li><b>type</b> <em>può essere paragonato ad una tabella nei db relazionali</em></li>
					</ul>
				</section>

				<section>
					<h2>Client</h2>
					<p>Come accennato ElasticSearch permette l'interrogazione tramite api RESTfull. <br/><br/>Potremmo utilizzare semplicemente il browser o le curl per interrogare ElasticSearch passando i dati in POST, PUT, GET o DELETE e ricevere una risposta in json o jsonp</p>
				</section>

				<section>
					<h2>Aggiungere un elemento ad un indice</h2>
					<pre><code>curl -XPUT 'http://localhost:9200/application/users/1' -d '{
    "user" : "kimchy",
    "status" : ""
}'
</code>
Risultato:
<code>
{"ok":true,"_index":"application","_type":"users","_id":"1","_version":1}
</code></pre>
<p></p>
				</section>

				<section>
<p>Il parametro version indica la versione dell'elemento , ci permette di non generare errori di concorrenza</p>
					<pre><code class="bash">
curl -XPUT 'http://localhost:9200/application/users/1' -d '{
    "user" : "kimchy",
    "status" : ""
}'
</code>
Risultato:
<code>
{"ok":true,"_index":"application","_type":"users","_id":"1","_version":2}
</code>
Possiamo anche specificare il numero di versione
<code>
curl -XPUT 'http://localhost:9200/application/users/1?version=2' -d '{
    "status" : "My status update"
}'
</code>
</pre>


				</section>

				<section>
					<h2>DELETE</h2>
					<pre><code>curl -XDELETE 'http://localhost:9200/application/users/1'

{
    "ok" : true,
    "_index" : "application",
    "_type" : "users",
    "_id" : "1",
    "found" : true
}
</code></pre>
				</section>

				<section>
					<h2>Ricerca</h2>
					<pre><code>
curl -XGET 'http://localhost:9200/application/users/1'
</code>
Risultato:
<code>
{"_index":"application","_type":"users","_id":"1","_version":4,"exists":true, "_source" : {
	   "status" : "My status update"
}}
</code>
                                        </pre>
				</section>
				<section>
					<h2>Richiesta di solo alcuni campi</h2> 
					<pre>
						<code>
curl -XGET 'http://localhost:9200/application/users/1?fields=status,name'
						</code>
Risultato:
						<code>
{"_index":"application","_type":"users","_id":"1","_version":5,"exists":true,"fields":{"status":"My status update","name":"my name"}}
						</code>
					</pre>
				</section>
				<section>
					<h2>Percolator</h2>
					<p>Il percolator è una funzionalità che permette di risalire dal termine di ricerca all'indice registrato.</p>
				</section>

				<section>
					<h2>Registrazione</h2>
<p>Creazione di una perculator query chiamata <b>kuku</b> nell'indice <b>test</b> per il valore <b>value1</b> </p>
					<pre>
						<code>
curl -XPUT localhost:9200/_percolator/test/kuku -d '{
    "query" : {
        "term" : {
            "field1" : "value1"
        }
    }
}'
						</code>
					</pre>

<p><a href="https://github.com/dylanahsmith/elasticsearch-examples/blob/master/percolate.sh">https://github.com/dylanahsmith/elasticsearch-examples/blob/master/percolate.sh</a></p>
				</section>

				<section>
					<h2>Ricerca</h2>
					<p>Inserimento di un documento che coincide con il valore di ricerca</p>
					<pre><code>
curl -XGET localhost:9200/test/type1/_percolate -d '{
    "doc" : {
        "field1" : "value1"
    }
}'
</code></pre>
				</section>

				<section>
					<h2>Risultato</h2>
					<pre><code>
{"ok":true, "matches":["kuku"]}
</code></pre>
				</section>

				<section>
					<h2>ElasticSearch && Ruby</h2>

					<p><a href="https://github.com/karmi/tire">Karmi/Tire</a></p>
				</section>

				<section>
					<h2>Model</h2>
					<pre><code class="ruby">
include Tire::Model::Search
include Tire::Model::Callbacks

def self.search(params)
  tire.search(load: true) do
    query { string params[:query], default_operator: "AND" } if params[:query].present?
    filter :range, published_at: {lte: Time.zone.now}
  end
end
</code></pre>
				</section>

				<section>
					<h2>Search code</h2>
					<pre><code class="ruby">
@result = Model.search(params)
					</code></pre>
				</section>

				<section>
					<h2>Link utili</h2>
					<ul>
						<li><a href="http://karmi.github.io/tire/" >http://karmi.github.io/tire/</a></li>
						<li><a href="http://collectiveidea.com/blog/archives/2013/01/14/reverse-search-with-elasticsearch-1/">http://collectiveidea.com/blog/archives/2013/01/14/reverse-search-with-elasticsearch-1/</a></li>
						<li><a href="http://railscasts.com/episodes/306-elasticsearch-part-1">http://railscasts.com/episodes/306-elasticsearch-part-1</a></li>
						<li><a href="http://www.elasticsearch.org/guide/">http://www.elasticsearch.org/guide/</a></li>
						<li><a href="https://gist.github.com/wingdspur/2026107">https://gist.github.com/wingdspur/2026107</a></li>
						<li><a href="https://twitter.com/elasticsearch">https://twitter.com/elasticsearch</a></li>
						<li><a href="http://stackoverflow.com/questions/15694724/shards-and-replicas-in-elasticsearch">http://stackoverflow.com/questions/15694724/shards-and-replicas-in-elasticsearch</a></li>

					</ul>
				</section>

				<section>
					<h1>THE END</h1>
					<img src="img/end.jpg"/>
				</section>

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