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Type:
Improvement
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Resolution: Won't Do
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Priority:
Major - P3
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Affects Version/s: None
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Component/s: None
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Catalog and Routing
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CAR Team 2026-04-13
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The current acquire path calls tryAcquire() before enqueueing: TicketHolder calls tryAcquire() and only then acquire(), and UnorderedTicketSemaphore::acquire() also starts with a tryAcquire() loop. This adds extra contention and complexity.
Change the acquire path so that when a caller chooses to wait, it enqueues immediately without a prior tryAcquire(). Keep tryAcquire() as a separate non-blocking path for callers that want to avoid waiting.
- depends on
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SERVER-119347 Generalize TicketHolder to support pluggable concurrency primitives and policies
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- Closed
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- is related to
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SERVER-122680 OrderedTicketSemaphore might queue operations with tickets available
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- Closed
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- In Code Review
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