ElasticSearch ElasticSearch Cluster Management & Administration 2

Question 1

Which node role in Elasticsearch is responsible for hosting document data and executing data-related operations like search and CRUD?

Accepted Answer

data

Answer

The 'data' node role is responsible for storing indexed documents and performing operations such as search, aggregation, and CRUD requests.

Question 2

What did the discovery.zen.minimum_master_nodes setting control in Elasticsearch versions prior to 7.0?

Accepted Answer

The quorum of votes needed to elect a master and prevent split-brain

Answer

discovery.zen.minimum_master_nodes defined the quorum (typically (N/2)+1) required to elect a master, preventing two partitions from each electing their own master.

Question 3

What does the node.roles configuration setting define in Elasticsearch 7.9 and later?

Accepted Answer

Defines the functional roles assigned to a specific node

Answer

node.roles allows explicit assignment of roles (master, data, ingest, ml, etc.) to a node, replacing older boolean role settings like node.master and node.data.

Question 4

Which API is used to update cluster-wide settings dynamically without restarting any Elasticsearch nodes?

Accepted Answer

PUT /_cluster/settings

Answer

The PUT /_cluster/settings API allows updating persistent and transient cluster settings at runtime without requiring a node or cluster restart.

Question 5

What is the key difference between 'persistent' and 'transient' settings in the Elasticsearch cluster settings API?

Accepted Answer

Persistent settings survive full cluster restarts; transient settings are lost on full cluster restart

Answer

Persistent settings are written to the cluster state and survive full cluster restarts, while transient settings are cleared when the entire cluster restarts.

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ElasticSearch ElasticSearch Cluster Management & Administration 2