Konstantin Knizhnik 2e3dc9a8c2 Add rel_size_replica_cache (#11889) ...

## Problem

See 
Discussion:
https://neondb.slack.com/archives/C033RQ5SPDH/p1746645666075799
Issue: https://github.com/neondatabase/cloud/issues/28609

Relation size cache is not correctly updated at PS in case of replicas.

## Summary of changes

1. Have two caches for relation size in timeline:
`rel_size_primary_cache` and `rel_size_replica_cache`.
2. `rel_size_primary_cache` is actually what we have now. The only
difference is that it is not updated in `get_rel_size`, only by WAL
ingestion
3. `rel_size_replica_cache` has limited size (LruCache) and it's key is
`(Lsn,RelTag)` . It is updated in `get_rel_size`. Only strict LSN
matches are accepted as cache hit.

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Co-authored-by: Konstantin Knizhnik <knizhnik@neon.tech>

2025-05-20 15:38:27 +00:00

..

src

Add rel_size_replica_cache (#11889)

2025-05-20 15:38:27 +00:00

Cargo.toml

cover direct IO + concurrent IO in unit, regression & perf tests (#11585)

2025-04-17 15:53:10 +00:00