[Solved] Given the following index setting, what will happen when Elasticsearch allocates shards? { "settings": { "index.routing.allocation.awareness.include": { "rack_id": "rack1,rack2" } } } | Elasticsearch

Elasticsearch - Cluster Management

Given the following index setting, what will happen when Elasticsearch allocates shards?

{
  "settings": {
    "index.routing.allocation.awareness.include": {
      "rack_id": "rack1,rack2"
    }
  }
}

AShards will be allocated only on rack3 nodes

BShards will be allocated on any node regardless of rack_id

CShards will only be allocated on nodes with rack_id rack1 or rack2

DAllocation will fail because of invalid syntax

Step-by-Step Solution

Solution:

Step 1: Understand the setting meaning
The setting index.routing.allocation.awareness.include with rack_id values means shards should only go to nodes with those rack_ids.
Step 2: Apply to given values
Since rack1 and rack2 are included, shards will only be allocated on nodes labeled with rack1 or rack2.
Final Answer:
Shards will only be allocated on nodes with rack_id rack1 or rack2 -> Option C
Quick Check:
Allocation include rack1,rack2 = shards on rack1 or rack2 only [OK]

Quick Trick: Include means restrict allocation to listed racks [OK]

Common Mistakes:

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Given the following index setting, what will happen when Elasticsearch allocates shards?