ETCd scale-out advantages

[Hariharan Sethuraman]

Hi ETCd experts,

Normally we run 3 node ETCd cluster. Is there any advantage of scaling out? 

Lets say if I scale out from 3 to 5, the advantage I see is:

with 3 nodes ETCd can tolerate 1 node failure

with 5 nodes ETCd can tolerate upto 2 node failures

Also I understand the write latency of 5 nodes > write latency of 3 node due to increase in consensus.

Any other advantage the user gets after scaling-out? I doubt if there is any key distribution w/o eventual consistency.

Thanks,

Hari

[Cenk Altı]

Scaling out does not have any advantage other than availability.

In etcd, all keys are replicated to all nodes in the cluster. There is no sharding or the keys.

You can read these 2 sections to learn more:

- https://etcd.io/docs/v3.5/learning/why/#using-etcd-for-metadata

- https://kubernetes.io/docs/tasks/administer-cluster/configure-upgrade-etcd/#scaling-up-etcd-clusters

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[Hariharan Sethuraman]

Thank you for confirming