solr admin interview questions - Wikitechy https://www.wikitechy.com/interview-questions/tag/solr-admin-interview-questions/ Interview Questions Tue, 14 Sep 2021 10:31:23 +0000 en-US hourly 1 https://wordpress.org/?v=6.9.4 https://www.wikitechy.com/interview-questions/wp-content/uploads/2025/10/cropped-wikitechy-icon-32x32.png solr admin interview questions - Wikitechy https://www.wikitechy.com/interview-questions/tag/solr-admin-interview-questions/ 32 32 How to install apache Solr ? https://www.wikitechy.com/interview-questions/apache-solr/how-to-install-apache-solr/ https://www.wikitechy.com/interview-questions/apache-solr/how-to-install-apache-solr/#respond Mon, 12 Jul 2021 15:17:04 +0000 https://www.wikitechy.com/interview-questions/?p=242

Install apache Solr

  • Solr is open source search platform and built upon java library. It is one of the most popular search platform used by many websites so that it can search and index across the site then return associated content based on search query.

Step 1: Go to cmd prompt then check for JRE with right version.

  • If JRE is available in your system it will show you the version. If not then you have to install JRE.
install solr step 1

Step 2: Download require Solr version from below url

Step 3: Extract the Zip folder in your machine. Now go to extracted Solr folder. Get inside the example folder and execute the command.

install solr step 3
  • As soon as you run the above command Solr will start with default port 8983. That will accessible on http://localhost:8983/solr/#/
  • This will install Solr and run in the background. By default it will use the port number 8983.
  • You can also change default port number to one of your choice.
install solr step 4

Step 4: To Configure Solr with Drupal 7.x Download Solr from https://www.drupal.org/project/apachesolr download the recommended version and install.

Step 5: Go to \apachesolr-7.x-1.8\apachesolr\solr-conf\solr-4.x copy all the files to Solr server directory [solr-4.6.1\example\solr\collection1\conf\] and replace them with existing files.

After replacing your file should look like.

install solr step 5

Now your Solr admin page look like

install solr step 6

Step 6: So we are almost done with Solr server setup. configure on module level

  • To do this we need to go to Solr setting page /admin/config/search/apachesolr/settings

Fill up mandatory detail like Solr server URL and Description and hit on Test Connection button.

install solr step 7

Step 7: Almost done with Solr server setup and configuration, then do indexing by visiting default index page admin/config/search/apachesolr.

install solr step 8
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Index multiple tables using SOLR

There are various ways to do it and it depends on your table schema. Some simple ones would be like:

  • If you have 2-3 different tables and they are kind of unrelated then in that case you need to have an extensive Solr schema and just index each table separately. You would perform this only when you desire to use Solr for just search on documents present in dissimilar tables.
  • It’s like you have a table STUDENT (id,name,roll) and TEACHER (id,name,subject,qualification), you need to have these fields in your solr schema (id,name,roll,subject,qualification).
  • Now index the two tables either by solrj or use Data Import Handler.
  • If you have different tables and have relations between them then you need to write SQL queries which perform joins between them and get the columns that you would like to index into solr.

Indexing either of the two tables (and not both the tables):

DB-config.xml

<dataConfig>
<dataSource driver="com.metamatrix.jdbc.MMDriver" url="jdbc:....." />
<document name="doc">
<entity name="table1"
query="select * from table1">
<field column="ID" name="ElementID" />
<field column="Name" name="ElementName" />
<field column="ElementType" name="ElementType" />
<field column="RepId" name="ElementRepId" />
</entity>

<entity name="table2"
query="select * from table2">
<field column="id" name="ElementPropertyID" />
<field column="Name" name="ElementPropertyName" />
<field column="DataType" name="ElementPropertyDataType" />
<field column="RepId" name="ElementPropertyRepId" />

</entity>
</document>
</dataConfig>

Schema.xml

<fields>

<field name="ElementID" type="string" indexed="true"
stored="true" />
<field name="ElementName" type="string" indexed="true"
stored="true" />
<field name="ElementType" type="string" indexed="true"
stored="true" />
<field name="ElementRepId" type="string" indexed="true"
stored="true" />

<field name="ElementPropertyID" type="string" indexed="true"
stored="true" />
<field name="ElementPropertyName" type="string" indexed="true"
stored="true" />
<field name="ElementPropertyDataType" type="string"
indexed="true" stored="true" />
<field name="ElementPropertyRepId" type="string" indexed="true"
stored="true" />


<dynamicField name="*" type="ignored" />
</fields>
<uniqueKey>ElementPropertyID</uniqueKey>
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Solr represents data

  • In Apache Solr, a Document is the part of search as well as index.
  • Index consists of one or more Documents and then Document consists of one or more Fields.
  • In database terminology,a Document corresponds to a row of the table, and a Field corresponds to a column of the table.
apache solr with hadoop

Schema

  • Before adding documents to Solr, you need to specify the schema, represented in a file called schema.xml.
  • It is not suitable to modify the schema after documents has added to the index.

The schema declares:

  1. what kinds of fields there are
  2. which field should be used as the unique/primary key
  3. which fields are required
  4. how to index and search each field

Field Types

  • In Solr, every field has a type.
  • Apache Solr expands the variety of field types offered in Lucene.

Examples of basic field types available in Solr include:

  1. float
  2. long
  3. double
  4. date
  5. text
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Apache Solr works

Indexing

  • Apache Solr is capable to get quick search responses because, as a replacement for searching the text directly, it searches an index instead.
  • It stores index in a directory called index in the data directory.
how apache solr works

Working:

  • The Apache Solr creates inverted index of the documents that are posted in to its collection or core.
  • Core or collection is just part entity which can be used to post documents and running queries on that set of documents.
  • Inverted index is a main term in the domain of Information Retrieval and Natural Language Processing.
  • Now take a document, note down all the unique words appearing in that document as well as note the frequency of the words. Hence the inverted index is ready.
  • Solr creates similar inverted index of the documents posted to its core using a defined schema.
  • Schema is a blue print which helps Solr in creating inverted index of the documents by giving a set of predefined fields in the schema.xml file.
  • Once Solr completes indexing the documents posted to its core or collection it can be used to run queries.
solr work
  • Now a user can query Solr for related documents using its query parser or admin panel.
  • When a query is given to Solr, it breaks the query into different chunks or entities and matches it with the inverted index of the documents created previous.
  • The documents obtained accordingly of a Solr search is based on the same class and other constraints defined in its schema.xml and solr.config file.
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