Add find-or-insert Reservation API to ConcurrentHashtable - #12462

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dougqh wants to merge 13 commits into

feat/concurrenthashtable-reservation-api-v2

Commits on Sep 11, 2026

Add find-or-insert Reservation API to ConcurrentHashtable

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b38bab3
Move RawLogMessage equality logic into matches(), have equals() delegate

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b8b5037
Simplify LogCollector's find-or-insert and fix a missed increment

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fe622b3
Finish ReentrantLock migration for ConcurrentHashtable and shorten drain's lock hold

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14d52bc
Add JMH benchmarks for hashIterable/hashIterator allocation and drain lock contention

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474241a
Add whole-sweep-lock variant to drain benchmark for A/B comparison

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3349e9d
Prefix hashIterable call with ConcurrentHashtable in LogCollector.find

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b632878
Note removeIf as a candidate for the same per-bucket lock tradeoff as drain

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f1d5316
Trim inline comments per review feedback

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fa44aac
Add test coverage for remaining Reservation overloads

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4012524
Fix duplicate-undercounting race in ConcurrentHashtable reservations

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16b56c8
Add a near-capacity JMH benchmark for LogCollector

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b226804
Merge tryReserve and tryReserveFor into a single keyHash-aware method

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c87c904