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Improve comments on image layer.

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Make it more explicit that if a key doesn't exist in an image layer, it
doesn't exist.
This commit is contained in:
Heikki Linnakangas
2022-03-11 09:47:09 +02:00
parent bce2da4e55
commit d5b8380dae
1 changed files with 7 additions and 4 deletions
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11
pageserver/src/layered_repository/image_layer.rs
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@@ -1,8 +1,11 @@
//! An ImageLayer represents an image or a snapshot of a segment at one particular LSN.
//! It is stored in a file on disk.
//! An ImageLayer represents an image or a snapshot of a key-range at
//! one particular LSN. It contains an image of all key-value pairs
//! in its key-range. Any key that falls into the image layer's range
//! but does not exist in the layer, does not exist.
//!
//! On disk, the image files are stored in timelines/<timelineid> directory.
//! Currently, there are no subdirectories, and each image layer file is named like this:
//! An image layer is stored in a file on disk. The file is stored in
//! timelines/<timelineid> directory. Currently, there are no
//! subdirectories, and each image layer file is named like this:
//!
//! <key start>-<key end>__<LSN>
//!