Web / Apache Solr Interview questions

What is a Solr collection?

A collection is the logical unit of indexing and search in SolrCloud, Solr's distributed mode. Unlike a core, a collection can span multiple servers: its data is split into shards, and each shard can have multiple replicas for redundancy.

All nodes belonging to a collection share a single configuration set stored in ZooKeeper, so schema and solrconfig changes apply cluster-wide instead of per node.

From the client's point of view, a collection looks like one searchable index even though it may physically be spread across many machines.

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A SolrCloud collection can be split into which components for scale? Shards, each with replicas

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Cores only, with no replication

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Separate ZooKeeper ensembles

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Where is a collection's shared configuration set stored? In each replica's local disk only

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In ZooKeeper

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In the client application

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More Related questions...

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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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