Elasticache redis Upgrade from 6.0 to 6.2 | Cache loss

Question

I have recently upgraded my elasticache cluster with single node from 6.0 to 6.2 engine version and I have lost all keys stored during this upgrade.
Please let me why this happened?

Answer

Quoting from AWS documentation "The Amazon ElastiCache for Redis engine upgrade process is designed to make a best effort to retain your existing data and requires successful Redis replication." Since you had a single node you can expect data loss

--Syd

Answer

Two Questions -
1) What is the process you used for upgrading EC Redis? are you running in Cluster mode disabled/enabled? do you have any replicas?
2) What instance type are you using? Did instance change instance type during upgrade?

Elasticache redis Upgrade from 6.0 to 6.2 | Cache loss

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