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Memcached update

Imported from Confluence

Content may be outdated. Verify before following any procedures. View original | Last updated: March 2025

In order to update GCP Memortstor Memcached:

  1. Make it HA, add 1 more node to the cluster, currently we have one node to save costs.
  2. Wait until data replicated equally to both nodes.
  3. Trigger update, you will see that update is performed one by one. So no downtime expected.
    Screenshot 2025-03-20 at 12.25.15.png
  4. Downscale cluster to 1 node. Please pay atention that scale in is performed according to this process -Google Cloud - Memcached Scale Instances 
Scaling in
If you scale in your instance, you will lose the data that is stored in the nodes that are deleted from your cluster.

During a scale in operation, Memorystore removes nodes from the end of the node list. For example, if you are scaling from 12 nodes to 8 nodes, nodes 9-12 will be deleted from the instance.

You can view the node list on your Memcached instance's node list tab in the Google Cloud console.

If your active node is in the end of the list you need to perform failover to move traffic to node which will not be removed