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Scenario #56
Cluster Management
K8s v1.20, GKE
Inconsistent Application Behavior After Pod Restart
Application behavior became inconsistent after pod restarts due to improper state handling.
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What Happened
After a pod was restarted, the application started behaving unpredictably, with some users experiencing different results from others due to lack of state synchronization.
Diagnosis Steps
- 1Checked pod logs and noticed that state data was being stored in the pod’s ephemeral storage.
- 2Verified that application code did not handle state persistence properly.
Root Cause
The application was not designed to persist state beyond the pod lifecycle, leading to inconsistent behavior after restarts.
Fix/Workaround
• Moved application state to persistent volumes or external databases.
• Adjusted the application logic to handle state recovery properly after restarts.Lessons Learned
State should be managed outside of ephemeral storage for applications that require consistency.
How to Avoid
- 1Use persistent volumes for stateful applications.
- 2Implement state synchronization mechanisms where necessary.