Elasticsearch - Cluster Management
If cluster.routing.allocation.awareness.attributes is set to 'zone', and nodes exist in zones 'us-east' and 'us-west', what happens if all replicas are on 'us-east' nodes?
If cluster.routing.allocation.awareness.attributes is set to 'zone', and nodes exist in zones 'us-east' and 'us-west', what happens if all replicas are on 'us-east' nodes?
medium📝 Predict Output Q5 of Q15
Step-by-Step Solution
Solution:
Step 1: Understand awareness attribute enforcement
Awareness tries to balance shards across attribute values like zones to improve fault tolerance.Step 2: Analyze replica placement
If replicas are all on 'us-east', Elasticsearch will attempt to relocate some to 'us-west' nodes to satisfy awareness.Final Answer:
Elasticsearch will relocate replicas to 'us-west' nodes if available -> Option CQuick Check:
Awareness balances replicas across zones = Elasticsearch will relocate replicas to 'us-west' nodes if available [OK]
Quick Trick: Awareness moves replicas to different zones automatically [OK]
Common Mistakes:
MISTAKES- Assuming replicas stay on same zone
- Thinking allocation fails on imbalance
- Believing primaries move instead of replicas
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