ElasticSearch ElasticSearch Core Concepts & Architecture 3

Question 1

What is the role of 'coordinating nodes' in Elasticsearch?

Accepted Answer

They route requests, reduce results, and distribute tasks across the cluster

Answer

Coordinating nodes receive client requests, route them to the appropriate shards, gather results, and return the final response.

Question 2

What is a 'hot-warm architecture' in Elasticsearch?

Accepted Answer

A tiered storage approach where hot nodes handle new data and warm nodes hold older data

Answer

A hot-warm architecture uses fast (hot) nodes for recent, frequently queried data and slower, cost-effective (warm) nodes for older data.

Question 3

What is the Elasticsearch 'refresh interval'?

Accepted Answer

The interval at which new writes are made available for search

Answer

The refresh interval controls how often Elasticsearch performs a refresh operation to make newly indexed documents searchable; the default is 1 second.

Question 4

What does the 'translog' in Elasticsearch do?

Accepted Answer

Provides durability by recording operations before they are flushed to Lucene

Answer

The transaction log (translog) ensures durability by recording every operation in a log file before it is permanently committed to the Lucene index.

Question 5

What is the purpose of 'index aliases' in Elasticsearch?

Accepted Answer

To provide a stable name that can point to one or more indices, enabling zero-downtime reindexing

Answer

Index aliases allow you to refer to one or more indices using a single name, which is useful for zero-downtime reindexing and index management.

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ElasticSearch ElasticSearch Core Concepts & Architecture 3