Q1 : Define the concept of Faceting in Apache Solr?
A : Faceting is the arrangement of search results based on real-time indexing of document fields. With the flexible and advanced Faceting scheme, search results become more accurate and smoother even for the complex queries.
Q2 : Define the Phonetic filters in Solr?
A :Phonetic filters are the special filters in Solr that are used to create tokens with the help of phonetic encoding algorithms.
Q3 : What are the advantages and disadvantages of Standard Query Parser?
A : Also known as Lucence Parser, the Solr standard query parser enables users to specify precise queries through a robust syntax. However, the parser’s syntax is vulnerable to many syntax errors unlike other error-free query parsers like DisMax parser.
Q4 : Can you name few highlighters in Solr?
A : Yes, of course, I can explain u few that I have worked on personally. These are Standard Highlighters, FastVector Highlights, and Posting Highlights. All of three are designed carefully to serve a purpose.
- Standard Highlighter gives highly accurate search results even for the advanced or complex query parsers.
- FastVector Highlighter is not so popular as the Standard highlighter yet it can be used to execute simple queries that are easy to work with.
- Posting Highlighter is the most accurate and effective choice for small queries but not suitable for large query terms.
Q5 : How to install Solr?
A : The three steps of Installation are:
- Server-related files, e.g. Tomcat or start.jar (Jetty)
- Solr web app as a .war
- Solr Home which comprises the data directory and configuration files
Q6 : Do you know how to shut down Apache Solr correctly?
A : Well, this is easy to shut down Solr correctly. First of all, you should shut down the Solr at the same terminal it was started. You can use shortcut key CTRL + C to shut it down properly without any loss of data.
Q7 : What Is Field Analyzer?
A : Working with textual data in Solr, Field Analyzer reviews and checks the filed text and generates a token stream. The pre-process of analyzing the input text is performed at the time of searching or indexing and at query time. Most Solr applications use Custom Analyzers defined by users. Remember, each Analyzer has only one Tokenizer.
Q8 : What syntax is used to check whether Solr is currently running or not?
A : $ bin/solr status is used to check Solr running status.
Q9 : Which type of data is generally declared by the schema?
A : Schema generally declares how to index each field, which type of fields are available within a schema, which fields are necessary to define, and which filed can be used a primary key for the database.
Q10 : What is Solr Cloud?
A : Solr has unlimited capabilities to perform fault-tolerant accurate searches that enable users to set up huge clusters of Solr servers. These capabilities are served with the SolrCloud in Apache Solr.
Q11 : What Are The Features Of Apache Solr?
A :
- Allows Scalable, high-performance indexing Near real-time indexing.
- Standards-based open interfaces like XML, JSON, and HTTP.
- Flexible and adaptable faceting.
- Advanced and Accurate full-text search.
- Linearly scalable, auto index replication, auto failover, and recovery.
- Allows concurrent searching and updating.
- Comprehensive HTML administration interfaces.
- Provides cross-platform solutions that are index-compatibleFind out how Apache Solr works perfectly with Hadoop in this blog post.
Q12 : Define the copying field in Apache Solr?
A : The copying field is used to populate fields where data is usually copied or written the same as earlier fields. Make sure that syntax has been used correctly otherwise it may show errors.
Q13 : What are the important configuration files of Solr?
A :
- Solr supports two important configuration files
- solrconfig.xml
- schema.xml
Q14 : What is request handler?
A : When a user runs a search in Solr, the search query is processed by a request handler. SolrRequestHandler is a Solr Plugin, which illustrates the logic to be executed for any request.Solrconfig.xml file comprises several handlers (containing a number of instances of the same SolrRequestHandler class having different configurations).
Q15 : What file contains configuration for data directory?
A : Solrconfig.xml file contains configuration for data directory.
Q16 : What is Highlighting?
A : Highlighting Is nothing but the Fragmentation of documents corresponding to the user’s query that is included in the Query response. Afterward, these fragments are displayed and placed in the special segment, that is used by the users and clients to present the snippets. The Solr contains a number of highlighting utilities and has control over various fields. The highlighting utilities can be called by Handlers of Request and can be reused with the standard query parsers.
Q17 : What are the advantages and disadvantages of Standard Query Parser?
A : Also known as Lucence Parser, the Solr standard query parser enables users to specify precise queries through a robust syntax. However, the parser’s syntax is vulnerable to many syntax errors unlike other error-free query parsers like DisMax parser.
Apache Solr is a standalone full-text search platform to perform searches on multiple websites and index documents using XML and HTTP. Built on a Java Library called Lucence, Solr supports a rich schema specification for a wide range and offers flexibility in dealing with different document fields. It also consists of an extensive search plugin API for developing custom search behavior.
Q18 : What file contains definition of the field types and fields of documents?
A : schema.xml file contains definition of the field types and fields of documents.
Q19 : What is Apache Lucene?
A : Supported by Apache Software Foundation, Apache Lucene is a free, open-source, high-performance text search engine library written in Java by Doug Cutting. Lucence facilitates full-featured searching, highlighting, indexing and spellchecking of documents in various formats like MS Office docs, HTML, PDF, text docs and others.
Q20 : What is the use of Tokenizer?
A : The Tokenizer is used to break a stream of text into a series of Tokens, where each Token is an arrangement of characters in the text. The Token that is developed is then passed to the Token Filters which can update, remove and add the Tokens. Afterwards, that field is indexed by the resulting Token stream.
Q21 : What data is declared by Schema?
A : The data declared by a Schema:
- What fields are required.
- What types of fields are available.
- What field must be used as the primary/unique key.
- How to search and index each field.
Q22 : Define Dynamic Fields?
A : If the user forgets to define one or more fields, then the Dynamic Fields are a useful feature. They offer excellent flexibility to index fields that is not explicitly defined in the schema.
Q23 : What are the most common elements in solrconfig.xml?
A : The most common elements in solrconfig.xml are:
- Search components
- Cache parameters
- Data directory location
- Request Handlers
Q24 : What file contains configuration for data directory?
A : Solrconfig.xml file contains configuration for data directory.
Q25 : What is Apache Solr?
A : Apache Solr is a standalone full-text search platform to perform searches on multiple websites and index documents using XML and HTTP. Built on a Java Library called Lucence, Solr supports a rich schema specification for a wide range and offers flexibility in dealing with different document fields. It also consists of an extensive search plugin API for developing custom search behavior.