Elasticsearch Node


Elasticsearch Node

Opster Team

Nov 2020


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Nodes in Elasticsearch

What it is:

Simply put a node is a single server that is part of a cluster. Each node is assigned one or more roles, which describe the node’s responsibility and operations – Data nodes stores the data, and participates in the cluster’s indexing and search capabilities, while master nodes are responsible for managing the cluster’s activities and storing the cluster state, including the metadata.

While it is possible to run several node instances of Elasticsearch on the same hardware, it’s considered a best practice to limit a server to a single running instance of Elasticsearch.

Nodes connect to each other and form a cluster by using a discovery method. 

Roles:

Master node:

Master nodes are in charge of cluster-wide settings and changes  – deleting or creating indices and fields, adding or removing nodes and allocating shards to nodes. Each cluster has a single master node that is elected from the master eligible nodes using a distributed consensus algorithm and is reelected if the current master node fails.

Coordinator or client node:

Coordinator Nodes are nodes that do not hold any configured role. They don’t hold data, are not part of the master eligible group nor execute ingest pipelines. Coordinator nodes serve incoming search requests and act as the query coordinator running query and fetch phases, send requests to every node that holds a shard being queried. The client node also distributes bulk indexing operations and route queries to shards based on the node’s responsiveness.


Related log errors to this ES concept


Failed to close node
Failed to close node on failed start
Removing node
failed to list shard for on node
Failed to verify repository
Job update was submitted to non-master node
Failed to disconnect to node
Failed to execute NodeStatsAction for ClusterInfoUpdateJob
Failed to update node information for ClusterInfoUpdateJob within timeout
Timed out while waiting for initial discovery state timeout:
Unable to retrieve node FS stats for (version 6.8)
Failed to validate incoming join request from node

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