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Fix: Pool 'db-5c52aaf50617332d2292619e5a36b490.fra.appwrite.center' is empty (size 24, active 0, idle 0) - #34
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… Throwable pop() reserves a capacity slot (connectionsCreated++) before creating a connection, then decrements it on failure. The catch only handled \Exception, so a \Throwable that is not an \Exception (e.g. a \TypeError from the init callback) propagated without releasing the reserved slot. Each such failure permanently shrank the pool's usable capacity. Once the leaked count reached `size`, pop() would refuse to create new connections and every request failed with "Pool '...' is empty (size N, active 0, idle 0)" even though nothing was actually in use. Catch \Throwable so the reserved slot is always released, matching the \Throwable handling already used in destroyConnection(). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
claudear
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Jul 23, 2026
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Fix Confidence: 75/100 |
Thanks for contributing! This repository is a read-only mirror; development for this library happens in |
Greptile SummaryFixes pool-capacity leakage when connection creation throws a non-Exception Throwable.
Confidence Score: 5/5The PR appears safe to merge, with the connection slot cleanup correctly extended to non-Exception failures. The changed catch preserves the existing failure path while ensuring the slot reserved before connection creation is decremented for TypeError and other Throwable failures, and the regression test directly validates the repaired accounting. Important Files Changed
Reviews (1): Last reviewed commit: "fix(pools): release reserved slot when c..." | Re-trigger Greptile |
loks0n added a commit
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Jul 27, 2026
pop() reserves capacity by incrementing connectionsCreated before the connection exists, then releases it in a catch. The catch was scoped to \Exception, so anything else escaping createConnection() kept the slot. The init callback is caller supplied, so an Error is entirely reachable: a TypeError from the callback, or a failure inside an adapter. Each leaked slot is permanent for the life of the process, and they accumulate one failed pop at a time. Once connectionsCreated reaches size the pool refuses to create anything and reports itself empty while nothing is actually in use — "Pool 'x' is empty (size 24, active 0, idle 0)". Only a restart recovers it, which is why an upstream outage that should degrade into slow acquisition instead ratchets a process into permanent failure that outlives the outage. Catch \Throwable, and move the release into a finally guarded by a $reserved flag so the reservation is balanced on every path out of the block, not only the ones enumerated in a catch. destroyConnection() already used \Throwable for the same reason a few lines below. The added test drains a size-2 pool with five pops against an init callback that throws a TypeError. Before this change count() drops to 0 with nothing handed out; after it stays at 2. Reported previously as utopia-php/pools#34, which was auto-closed because that repository is a read-only mirror. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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Resolves CLOUD-3NVF (sentry).
PR opened automatically by claudear from pushed branch
fix/pool-creation-slot-leak-on-throwable.