Web / Apache Solr Interview questions

List the ways to import data into Solr?

Solr supports several ingestion paths depending on the source system and update frequency:

Update APIs - post JSON, XML, or CSV directly to /update using curl, the bin/post tool, or an HTTP client.
SolrJ - programmatic indexing from Java applications.
DataImportHandler (DIH) - pulls data from a database, XML, or RSS feed via a configuration file; deprecated as a bundled module in newer Solr versions.
Streaming pipelines - tools like Apache NiFi, Kafka Connect, or Logstash push data continuously into Solr.

For production systems with frequent updates, a streaming pipeline or the update API is generally preferred over DIH because it decouples ingestion from Solr's own process.

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Which tool posts JSON/CSV/XML files directly to the /update endpoint from the command line? ZooKeeper CLI

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bin/post

✓ Correct! Well done.

solr.sh healthcheck

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What is a known limitation of DataImportHandler in recent Solr versions? It is deprecated as a bundled module

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It cannot connect to any database

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It only supports SolrCloud, not standalone

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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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