Web / Apache Solr Interview questions

What is the difference between NRT, TLOG, and PULL replicas in SolrCloud?

SolrCloud lets you mix replica types within a shard to balance indexing cost against read availability.

Type	Behavior	Can become leader?
NRT	Indexes locally and keeps a transaction log; supports soft commits for near-real-time search	Yes
TLOG	Keeps a transaction log but only updates its index via replication from the leader	Yes (failover only)
PULL	No transaction log; only replicates index segments from the leader	No

A common pattern is a small number of NRT or TLOG replicas to absorb indexing load and provide failover, plus a larger number of PULL replicas that just serve read traffic cheaply, since they skip the overhead of maintaining a transaction log.

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Which replica type never maintains a transaction log and cannot become leader? NRT

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TLOG

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PULL

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Which replica type supports soft commits for near-real-time visibility of its own indexed updates? NRT

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PULL

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TLOG only, never NRT

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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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