Web / Apache Solr Interview questions

What is the difference between DisMax and eDisMax query parsers?

eDisMax (Extended DisMax) is a superset of DisMax built to close its biggest gap: lack of full boolean logic.

DisMax	eDisMax
No support for AND/OR/NOT or field:value syntax	Supports full Lucene-style boolean operators and field:value syntax
No support for pure negative queries	Supports pure negative queries like `-inStock:false`
Limited multi-clause query handling	Adds `mm` (minimum should match) tuning and `userFields` whitelisting

In practice, most modern Solr applications default to eDisMax because it keeps DisMax's multi-field weighting behavior while letting power users mix in explicit field queries when needed, giving the best of both parsers without a real downside for typical search-box use cases.

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What key capability does eDisMax add over plain DisMax? Full boolean operators and field:value syntax

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Automatic ZooKeeper failover

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Built-in document deduplication

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Which parameter, mostly associated with eDisMax tuning, controls how many query clauses must match? hl.simple.pre

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mm (minimum should match)

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facet.range.gap

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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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