[Solved] You have a cluster with nodes labeled by 'zone' and 'rack'. You want to prevent shard allocation on a zone that is temporarily down but keep replicas balanced... Which setting helps achieve this? | Elasticsearch

Elasticsearch - Cluster Management

You have a cluster with nodes labeled by 'zone' and 'rack'. You want to prevent shard allocation on a zone that is temporarily down but keep replicas balanced across racks in other zones. Which setting helps achieve this?

AUse cluster.routing.allocation.awareness.force.zone with the list of available zones

BDisable shard allocation awareness temporarily

CSet cluster.routing.allocation.awareness.attributes to only 'rack'

DIncrease replica count to cover all racks

Step-by-Step Solution

Solution:

Step 1: Understand forced awareness
Forced awareness allows specifying which attribute values must have shards allocated, preventing allocation on missing or down zones.
Step 2: Analyze options
Use cluster.routing.allocation.awareness.force.zone with the list of available zones uses forced awareness for 'zone' to exclude down zones while keeping rack awareness active. Other options either disable awareness or do not address the problem.
Final Answer:
Use cluster.routing.allocation.awareness.force.zone with the list of available zones -> Option A
Quick Check:
Forced awareness excludes down zones from allocation [OK]

Quick Trick: Use forced awareness to exclude unavailable attribute values [OK]

Common Mistakes:

MISTAKES

Disabling awareness instead of forcing
Ignoring forced awareness setting
Relying on replica count alone

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Which setting helps achieve this?

Step 1: Understand forced awareness

Step 2: Analyze options

Final Answer:

Quick Check:

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