Web / Apache Solr Interview questions

What is the DataImportHandler in Solr?

The DataImportHandler (DIH) is a contrib module that pulls data into Solr from external sources - relational databases via JDBC, XML feeds, or flat files - based on a data-config.xml file describing the source query and field mappings.

It supports full imports, which reindex everything, and delta imports, which pull only changed rows based on a timestamp column, reducing load on repeated syncs.

DIH is convenient for simple, low-frequency batch syncs, but it has been removed from the default Solr distribution in recent major versions in favor of external ETL tools, so new projects should generally avoid depending on it.

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What file describes DIH's source query and field mappings? data-config.xml

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solrconfig.xml only

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zoo.cfg

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What does a delta import fetch compared to a full import? Only rows changed since the last sync

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Every row in the source table

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Only the schema, not data

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What is a Solr collection? What is highlighting in Solr search results? How do you optimize Solr for high-throughput near real-time indexing? What is a Solr core? List the ways to import data into Solr? How do you apply faceting in a Solr query? What is a filter in the Solr analysis chain? Explain the execution flow of an atomic update in Solr? What is Apache Solr? What are the types of fields in Solr? What is an inverted index in Solr? How do you connect to Solr using SolrJ? What is the DataImportHandler in Solr? What are the types of Solr request handlers? Define analyzer in Solr? Describe tokenizer in Solr? What is SolrCloud? What is the purpose of managed-schema in Solr? What is the purpose of solrconfig.xml? What is the purpose of a query parser in Solr?

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