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= Apache solr lucene

Voir : 
* http://lucene.apache.org/solr/guide/7_5/solr-tutorial.html
* https://www.unixmen.com/install-apache-solr-ubuntu/
* http://deeplearning.lipingyang.org/2017/04/30/install-apache-solr-on-ubuntu-16-04/
* https://dzone.com/articles/how-to-install-apache-solr-on-ubuntu-1604
* Datafari


Solr utilise le langage Java et est exécuté par un conteneur de servlets1, comme Tomcat, jusqu'à la version 5.0 puis devient un standalone Java.

Solr Instance : Ir refers to Solr server running inside JVM
Solr Core : In Solr, the term "core" is used to refer to a single index and confoguration files (such as solrconfig.xml, schema files etc!...) and
transaction log associated with code.
You can have one or more cores (indexes) running inside single Solr instance.
Physically each core maps to a subdirectory in the Solr home directory


<code bash>
tar xvf solr-7.5.0.tgz
cd solr-7.5.0

# See solr-7.5.0/README.txt
bin/solr start -help
</code>

Deux modes : 
* standalone (core)
* SolrCloud mode (collection)

=== Start

<code bash>
# standalone (core)
bin/solr start

# SolrCloud mode (collection)
bin/solr start -cloud
</code>

http://localhost:8983/solr

Cloudtab
http://localhost:8983/solr/#/~cloud


=== Create 

Creation d'un core
<code bash>
bin/solr create -c techproducts
</code>

<code bash>
bin/post -c techproducts example/exampledocs/books.csv
</code>

Requette
<code bash>
http://localhost:8983/solr/techproducts/select?q=*:*
</code>

=== Diag

<code bash>
bin/solr status
</code>

Les logs sont ici : ./server/logs/

Check / supervision
Voir https://lucene.apache.org/solr/guide/7_5/ping.html
<code bash>
#curl http://localhost:8983/solr/techproducts/admin/ping
curl -i -H "Accept: application/json" 'http://localhost:8983/solr/techproducts/admin/ping
</code>

=== Stop & clean

Stop
<code bash>
bin/solr stop -all
</code>

Clean
<code bash>
rm -rf server/solr/techproducts/
</code>

== Autres

<code bash>
cd solr-7.5.0/server
mkdir plop
cd plop
mkdir conf
mkdir data
touch core.properties
touch conf/schema.xml
touch conf/solrconfig.xml
</code>

=== Install Solr tomcat (anciennes versions)

Voir https://github.com/sunspot/sunspot/wiki/Configure-Solr-on-Ubuntu,-the-quickest-way

<code bash>
apt-get install openjdk-6-jdk
apt-get install solr-tomcat
</code>

Vérif
<code bash>
ps -ef |grep java
curl http://localhost:8080/solr/admin/ping |egrep 'str name="status.*OK'
</code>

=== Notes - starts

Pour les versions anciennes
<code bash>
java -jar start.jar
</code>

Avec la version 7.5 en faisant un ''ps -ef |grep java''
<code bash>
java -server -Xms512m -Xmx512m -XX:NewRatio=3 -XX:SurvivorRatio=4 -XX:TargetSurvivorRatio=90 -XX:MaxTenuringThreshold=8 -XX:+UseConcMarkSweepGC -XX:ConcGCThreads=4 -XX:ParallelGCThreads=4 -XX:+CMSScavengeBeforeRemark -XX:PretenureSizeThreshold=64m -XX:+UseCMSInitiatingOccupancyOnly -XX:CMSInitiatingOccupancyFraction=50 -XX:CMSMaxAbortablePrecleanTime=6000 -XX:+CMSParallelRemarkEnabled -XX:+ParallelRefProcEnabled -XX:-OmitStackTraceInFastThrow -verbose:gc -XX:+PrintHeapAtGC -XX:+PrintGCDetails -XX:+PrintGCDateStamps -XX:+PrintGCTimeStamps -XX:+PrintTenuringDistribution -XX:+PrintGCApplicationStoppedTime -Xloggc:/tmp/plop/solr-7.5.0/server/logs/solr_gc.log -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=9 -XX:GCLogFileSize=20M -Dsolr.log.dir=/tmp/plop/solr-7.5.0/server/logs -Djetty.port=8983 -DSTOP.PORT=7983 -DSTOP.KEY=solrrocks -Duser.timezone=UTC -Djetty.home=/tmp/plop/solr-7.5.0/server -Dsolr.solr.home=/tmp/plop/solr-7.5.0/server/solr -Dsolr.data.home= -Dsolr.install.dir=/tmp/plop/solr-7.5.0 -Dsolr.default.confdir=/tmp/plop/solr-7.5.0/server/solr/configsets/_default/conf -Xss256k -Dsolr.jetty.https.port=8983 -Dsolr.log.muteconsole -XX:OnOutOfMemoryError=/tmp/plop/solr-7.5.0/bin/oom_solr.sh 8983 /tmp/plop/solr-7.5.0/server/logs -jar start.jar --module=http
</code>