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memgraph / documentation

The official documentation for Memgraph open-source graph database.
https://memgraph.com/docs
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Replica - Physical Resources Clarity #726

Closed Ana-Marija-design closed 1 week ago

Ana-Marija-design commented 3 weeks ago

Current documentation page for Replication isn't clear enough about the fact that Replicas require the same physical resources as main instances.

@kgolubic feel free to add any potential questions to the issue thread and I'll go on a journey of discovery to find answers for you. (I'll ask Buda:) Please check and add questions before Tuesday (I got Buda on speed-dial on Tuesdays)

kgolubic commented 3 weeks ago
  1. What does "same physical resources as main instances" mean?
  2. Do they need to have the same CPU architecture (x86/AARCH)?
  3. Can one instance be Docker based, another native on on-prem, and another one in the cloud?
Ana-Marija-design commented 2 weeks ago

Same physical resources as main refers to CPU and memory. This is most important/necessary to get across, some assumptions created mismatched expectation w/potential customer because they had an assumption that they could "save" on replicas.

As to no 2. and 3., in theory it could work, but does depend on the compatibility of architectures so should be tested and we don't actually recommend/guarantee.

Tagging @gitbuda to raise flags if I wrote something incorrect.

kgolubic commented 1 week ago

@Ana-Marija-design and @gitbuda I need more clarification for "Same physical resources as main refers to CPU and memory.". Does this mean that machines must use two identical CPUs and the same amount of RAM? By identical CPU, I mean the same manufacturer and model.

Ana-Marija-design commented 1 week ago

The same amount of RAM = hard yes. CPUs = Not such a hard yes. Quite possibly different ones could/would work, but we don't really check this and can't guarantee it.

At the very least, each replica can become a main and will need the same resources to run smoothly. @gitbuda correct me if I've not stated the CPU issue well.

kgolubic commented 1 week ago

I've added the callout to the docs. Once we will have some more details we can update the docs one more time.