Clarify number of Pebble instances on a node

[jseldess]

Jesse Seldess (jseldess) commented:

Question from community:

Hi everyone, I have a question about the cockroach storage layer which isn't covered in the docs. I know that cockroach uses Pebble as the primary kv storage but the thing that is missing from the document is that does cockroach uses a single pebble DB instance in each node or create multiple instances based on the number of ranges each node should have?

Answer from @nvanbenschoten:

Cockroach uses a single Pebble instance across all Ranges on a node.

Jira Issue: DOC-926

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