Files
neon/pageserver/src/http
Alex Chi Z. 131b32ef48 fix(pageserver): clean up aux files before detaching (#11299)
## Problem

Related to https://github.com/neondatabase/cloud/issues/26091 and
https://github.com/neondatabase/cloud/issues/25840

Close https://github.com/neondatabase/neon/issues/11297

Discussion on Slack:
https://neondb.slack.com/archives/C033RQ5SPDH/p1742320666313969

## Summary of changes

* When detaching, scan all aux files within
`sparse_non_inherited_keyspace` in the ancestor timeline and create an
image layer exactly at the ancestor LSN. All scanned keys will map to an
empty value, which is a delete tombstone.
- Note that end_lsn for rewritten delta layers = ancestor_lsn + 1, so
the image layer will have image_end_lsn=end_lsn. With the current
`select_layer` logic, the read path will always first read the image
layer.
* Add a test case.

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Signed-off-by: Alex Chi Z <chi@neon.tech>
Co-authored-by: Christian Schwarz <christian@neon.tech>
2025-04-03 15:55:22 +00:00
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