Fix #859: PCMetrics memory leak from duplicate meter registrations#30

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astubbs wants to merge 42 commits into

bugs/857-paused-consumption-multi-consumers-bugfrom

bugs/859-pcmetrics-memory-leak

Commits on Apr 12, 2026

Build: override release.target=9 in mutiny module
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test: re-enable MultiInstanceRebalanceTest.largeNumberOfInstances for #857
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test: tag largeNumberOfInstances as performance, document flake rate
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test: add cooperative assignor variant, deterministic unit tests, debug logging for #857
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refactor: extract ManagedPCInstance from MultiInstanceRebalanceTest
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fix: prevent ConcurrentModificationException in ConsumerManager.poll() (#857)
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docs: identify silent stall root cause — numberRecordsOutForProcessing counter drift
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fix: adjust numberRecordsOutForProcessing on partition revoke (#857)
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docs: update investigation — counter fix triggers but stall persists
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fix: reset pausedForThrottling on partition assignment (#857)

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diag: add #857 diagnostic logging to retrieveAndDistributeNewWork
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diag: identify root cause of silent stall — assignment=0 during rebalance storm
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test: add gentleChaosRebalance test — passes 3/3, confirms rebalance storm is the issue

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cleanup: remove diagnostic logging, cooperative test passes 3/3

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docs: update investigation — gentle chaos passes, aggressive stall under investigation

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docs: identify root cause — commitCommand lock contention causes deadlock (#857)

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fix: replace synchronized(commitCommand) with ReentrantLock.tryLock() in onPartitionsRevoked (#857)

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docs: update investigation with tryLock fix results
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docs: remaining 20% failure is the CME from overlapping PC lifecycles
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test: revert settling delay, document thread-safety investigation

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feat: add ThreadConfinedConsumer wrapper for thread-safety enforcement (#857)

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Commits on Apr 13, 2026

Commits on Apr 15, 2026

ci: trigger CI run

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