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What is the main purpose of performing a rolling upgrade in Elasticsearch?

easy🧠 Conceptual Q11 of Q15
Elasticsearch - Cluster Management
What is the main purpose of performing a rolling upgrade in Elasticsearch?
ATo disable the cluster permanently during upgrade
BTo upgrade all nodes simultaneously for faster updates
CTo upgrade nodes one by one without stopping the entire cluster
DTo delete old data before upgrading
Step-by-Step Solution
Solution:
  1. Step 1: Understand rolling upgrade concept

    A rolling upgrade updates nodes one at a time to keep the cluster running.
  2. Step 2: Compare options

    Only To upgrade nodes one by one without stopping the entire cluster describes upgrading nodes one by one without stopping the cluster.
  3. Final Answer:

    To upgrade nodes one by one without stopping the entire cluster -> Option C
  4. Quick Check:

    Rolling upgrade = upgrade nodes individually [OK]
Quick Trick: Rolling upgrade means upgrading nodes one by one [OK]
Common Mistakes:
MISTAKES
  • Thinking all nodes upgrade at once
  • Confusing rolling upgrade with cluster shutdown
  • Assuming data is deleted during upgrade

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