Elasticsearch - Cluster Management
You ran a rolling upgrade but forgot to disable shard allocation first. What problem might occur?
You ran a rolling upgrade but forgot to disable shard allocation first. What problem might occur?
medium📝 Debug Q14 of Q15
Step-by-Step Solution
Solution:
Step 1: Understand shard allocation role during upgrade
Disabling allocation prevents shards from moving and keeps data safe during node restarts.Step 2: Consequence of not disabling allocation
If not disabled, shards may relocate while nodes restart, risking data loss or cluster instability.Final Answer:
Shards may move during upgrade causing data loss or instability -> Option AQuick Check:
Not disabling allocation risks shard movement and instability [OK]
Quick Trick: Always disable shard allocation before upgrade to avoid shard moves [OK]
Common Mistakes:
MISTAKES- Expecting upgrade to fail with syntax error
- Assuming cluster disables allocation automatically
- Thinking upgrade is safe without disabling allocation
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