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Improve layered repo README.

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Add an informal overview of how it works.
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Heikki Linnakangas
2021-11-12 19:59:31 +02:00
parent 849ac791a6
commit 3d172d98a3
2 changed files with 107 additions and 36 deletions
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docs/glossary.md
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@@ -51,11 +51,14 @@ Each PostgreSQL fork is considered a separate relish.
### Layer
Each layer corresponds to the specific version of a relish Segment in a range of LSNs.
A layer contains data needed to reconstruct any page versions within the
layer's Segment and range of LSNs.
There are two kinds of layers, in-memory and on-disk layers. In-memory
layers are used to ingest incoming WAL, and provide fast access
to the recent page versions. On-disk layers are stored as files on disk, and
are immutable.
are immutable. See pageserver/src/layered_repository/README.md for more.
### Layer file (on-disk layer)
Layered repository on-disk format is based on immutable files. The