ETCd scale-out advantages

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Hariharan Sethuraman

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Aug 29, 2022, 10:09:25 AM8/29/22
to etcd-dev
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

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Aug 29, 2022, 3:35:02 PM8/29/22
to Hariharan Sethuraman, etcd-dev
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:

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Hariharan Sethuraman

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Aug 29, 2022, 11:04:01 PM8/29/22
to Cenk Altı, etcd-dev
Thank you for confirming 
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