I am trying to update from t2.micro’s to t3.micro’s for my Memcached session storage. When I do I get UPDATE_FAILED CacheCluster Scaling is not supported for engine memcached (Service: AmazonElastiCache; Status Code: 400; Error Code: InvalidParameterCombination; Request ID: 9a3be0f3-2ddc-4daf-a6c8-5101670bbd6b). It looks like Redis can do an in place upgrade but Memcached cannot. Can it be changed so that Convox will destroy and re-create the node when changing Memcached nodes?
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I also ran into this issue, changing from Memcached version 1.4 to 1.5.
I just finished switching the last thing that was still using Memcached (sessions) to Redis and moved on. Memcached isn’t a super active project compared to Redis so it doesn’t surprise me that AWS barely cares about it.