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Speed up rel extend (#5983)

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This commit is contained in:
bojanserafimov
2023-12-01 09:11:41 -05:00
committed by GitHub
parent 92e7cd40e8
commit e49c21a3cd
1 changed files with 10 additions and 1 deletions
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11
pageserver/src/walingest.rs
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@@ -1437,7 +1437,16 @@ impl<'a> WalIngest<'a> {
// record.
// TODO: would be nice if to be more explicit about it
let last_lsn = modification.lsn;
let old_nblocks = if !self
// Get current size and put rel creation if rel doesn't exist
//
// NOTE: we check the cache first even though get_rel_exists and get_rel_size would
// check the cache too. This is because eagerly checking the cache results in
// less work overall and 10% better performance. It's more work on cache miss
// but cache miss is rare.
let old_nblocks = if let Some(nblocks) = self.timeline.get_cached_rel_size(&rel, last_lsn) {
nblocks
} else if !self
.timeline
.get_rel_exists(rel, last_lsn, true, ctx)
.await?