feat(pagebench): add aux file bench #7746
Merged
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Problem
part of #7462
Summary of changes
This pull request adds two APIs to the pageserver management API: list_aux_files and ingest_aux_files. The aux file pagebench is intended to be used on an empty timeline because the data do not go through the safekeeper. LSNs are advanced by 8 for each ingestion, to avoid invariant checks inside the pageserver.
For now, I only care about space amplification / read amplification, so the bench is designed in a very simple way: ingest 10000 files, and I will manually dump the layer map to analyze.
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Checklist before merging