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What is the expected cluster health status immediately after upgrading a single node during a rolling upgrade?

medium📝 Predict Output Q5 of Q15
Elasticsearch - Cluster Management
What is the expected cluster health status immediately after upgrading a single node during a rolling upgrade?
AGreen if shards are allocated correctly
BRed because the cluster is down
CYellow due to unassigned shards temporarily
DBlue indicating upgrade in progress
Step-by-Step Solution
Solution:

  1. Step 1: Recall cluster health states

    Green means all shards assigned, yellow means some unassigned replicas, red means primary shards missing.

  2. Step 2: Consider shard allocation during node upgrade

    During upgrade, some shards may be temporarily unassigned, causing yellow status.

  3. Final Answer:

    Yellow due to unassigned shards temporarily -> Option C

  4. Quick Check:

    Single node upgrade = temporary yellow health [OK]
Quick Trick: Expect yellow health during node upgrade, not red or green [OK]
Common Mistakes:
MISTAKES
  • Assuming cluster goes red during single node upgrade
  • Expecting green immediately after node restart
  • Confusing blue status which does not exist

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