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?

Syd · 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

Mahee Gunturu · 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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