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pageserver: reduce concurrency for gc-compaction (#12054)

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## Problem

Temporarily reduce the concurrency of gc-compaction to 1 job at a time.
We are going to roll out in the largest AWS region next week. Having one
job running at a time makes it easier to identify what tenant causes
problem if it's not running well and pause gc-compaction for that
specific tenant.

(We can make this configurable via pageserver config in the future!)

## Summary of changes

Reduce `CONCURRENT_GC_COMPACTION_TASKS` from 2 to 1.

Signed-off-by: Alex Chi Z <chi@neon.tech>
This commit is contained in:
Alex Chi Z.
2025-05-29 17:32:19 +08:00
committed by GitHub
parent 831f2a4ba7
commit 9e4cf52949
1 changed files with 2 additions and 2 deletions
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4
pageserver/src/tenant/timeline/compaction.rs
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@@ -206,8 +206,8 @@ pub struct GcCompactionQueue {
}
static CONCURRENT_GC_COMPACTION_TASKS: Lazy<Arc<Semaphore>> = Lazy::new(|| {
// Only allow two timelines on one pageserver to run gc compaction at a time.
Arc::new(Semaphore::new(2))
// Only allow one timeline on one pageserver to run gc compaction at a time.
Arc::new(Semaphore::new(1))
});
impl GcCompactionQueue {