CODEWITHSUNDEEP
elasticsearchsharding
Rhododendron
Rhododendron

Reputation: 559

Where replica are stored in elasticsearch?

I do not understand this subject, where replica are stored in elasticsearch?

Is primary shard a replica?

So, how ElasticSearch can use replica when the server crashes?

Upvotes: 0

Views: 721

Answers (2)

Andrei Stefan
Andrei Stefan

Reputation: 52366

I suggest installing the Marvel plugin. It has a dashboard where you can see where each shard is located and what its status is. See below an example. enter image description here

Upvotes: 0

bittusarkar
bittusarkar

Reputation: 6357

An Elasticsearch index is made up of 1 or more primary shards. Each of these primary shards can have 0 or more replica shards. A replica shard as the name suggests is an exact copy of the corresponding primary shard. Primary and its replica shard(s) are distributed among the cluster nodes such that they do not reside on the same node. This way, if a node containing a primary shard crashes, one of its replica shard that is hosted on another node is promoted to be act as a primary shard. Note: If you have a single node cluster, replica shards will not be allocated as then both primary and replica shards have to reside on the same node which does not make any sense.

There is a lot of material online about this topic. For starters, read this and this.

Upvotes: 2

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