docs(25-01): complete memory leak audit plan
Tasks completed: 4/4 - Fix timer and callback cleanup in useRecordingHelpers - Fix async cleanup in JKSessionRecordingModal - Create UAT checklist for memory verification - Verify memory stability with UAT checklist (user approved) SUMMARY: .planning/phases/25-memory-leak-audit/25-01-SUMMARY.md
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@ -9,10 +9,10 @@ See: .planning/PROJECT.md (updated 2026-02-19)
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## Current Position
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Phase: 24 (Fix Recording Crash)
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Phase: 25 (Memory Leak Audit)
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Plan: 01 of 1 complete
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Status: Phase complete
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Last activity: 2026-02-19 - Completed 24-01-PLAN.md
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Last activity: 2026-02-24 - Completed 25-01-PLAN.md
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Progress: [==========] 100%
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@ -49,9 +49,17 @@ Progress: [==========] 100%
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- Completion date: 2026-02-10
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- User verified: 15+ minute stability test passed, no freezes
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**v1.5 Fix Session Recording (In Progress):**
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**v1.5 Fix Session Recording (Complete):**
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- Phases: 2 (phases 24-25)
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- Plans completed: 2 (24-01, 25-01)
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- Completion date: 2026-02-24
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- Duration: 5 days (2026-02-19 -> 2026-02-24)
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- Files modified: 5
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- User verified: 15+ minute recording stability, no memory growth
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**v1.5 Fix Session Recording (Complete):**
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- Phase 24: Fix Recording Crash - Complete (24-01)
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- Phase 25: Memory Leak Audit - Not started
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- Phase 25: Memory Leak Audit - Complete (25-01)
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## Accumulated Context
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@ -77,6 +85,8 @@ Decisions are logged in PROJECT.md Key Decisions table.
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| 2026-02-10 | 23-01 | 15+ minute stability as primary metric | Reflects real-world usage patterns |
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| 2026-02-19 | 24-01 | Unpack recordSettings to individual params | C++ client expects individual params, not objects |
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| 2026-02-19 | 24-01 | Match legacy recordingModel.js signature | Ensures compatibility with existing C++ client |
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| 2026-02-24 | 25-01 | Conditional cleanup for window.JK callbacks | Multiple hook instances share callbacks - only delete if we own them |
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| 2026-02-24 | 25-01 | Ignore flag pattern for async operations | Prevents state updates on unmounted components |
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### Deferred Issues
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@ -94,19 +104,20 @@ Decisions are logged in PROJECT.md Key Decisions table.
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- **v1.2 Session Attachments** (Phases 12-16): Shipped 2026-02-07
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- **v1.3 Session Settings Tests** (Phases 17-18): Shipped 2026-02-08
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- **v1.4 Memory Leak Prevention** (Phases 19-23): Shipped 2026-02-10
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- **v1.5 Fix Session Recording** (Phases 24-25): In Progress
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- **v1.5 Fix Session Recording** (Phases 24-25): Shipped 2026-02-24
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## Session Continuity
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Last session: 2026-02-19
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Stopped at: Completed 24-01-PLAN.md
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Last session: 2026-02-24
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Stopped at: Completed 25-01-PLAN.md
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Resume file: None
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**v1.5 Fix Session Recording**
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**v1.5 Fix Session Recording - COMPLETE**
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Phases:
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All phases completed:
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- Phase 24: Fix Recording Crash - COMPLETE (24-01)
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- Phase 25: Memory Leak Audit - Not started
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- Phase 25: Memory Leak Audit - COMPLETE (25-01)
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**Next steps:**
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1. Phase 25: Memory leak audit for recording components
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- v1.5 is complete
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- Ready for next feature or bug fix cycle
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@ -0,0 +1,242 @@
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---
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phase: 25-memory-leak-audit
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plan: 01
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title: "Fix Recording Memory Leaks"
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one-liner: "Timer cleanup, conditional callback cleanup, and async ignore flags for recording components"
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type: fix
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subsystem: recording-ui
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status: complete
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completed: 2026-02-24
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files:
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created:
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- .planning/phases/25-memory-leak-audit/25-UAT.md
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modified:
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- jam-ui/src/hooks/useRecordingHelpers.js
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- jam-ui/src/components/client/JKSessionRecordingModal.js
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dependencies:
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requires:
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- phase: 24
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plan: 01
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reason: "Fixed recording crash before addressing memory leaks"
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provides:
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- "Timer cleanup for waitingOnStopTimer"
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- "Conditional callback cleanup for window.JK"
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- "Async operation ignore flags for recording modal"
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affects:
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- future: "Any component using recording hooks benefits from proper cleanup"
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tech-stack:
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added: []
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patterns:
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- "Conditional cleanup pattern for shared global callbacks"
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- "Ignore flag pattern for async operations in useEffect"
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- "useRef tracking for cleanup decisions"
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decisions:
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- id: CLEANUP-01
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date: 2026-02-24
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decision: "Conditional cleanup for window.JK callbacks"
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rationale: "Multiple hook instances (JKSessionScreen + JKSessionRecordingModal) share window.JK callbacks. Only delete if we still own the callback to prevent interfering with active instances."
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impact: "Prevents race conditions where one component unmounting deletes another component's callbacks"
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alternatives:
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- considered: "Always delete callbacks on unmount"
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rejected: "Would break active recording functionality"
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- considered: "Use event emitter pattern instead of global callbacks"
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rejected: "Too large refactor for memory leak fix"
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- id: CLEANUP-02
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date: 2026-02-24
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decision: "Ignore flag pattern for async operations"
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rationale: "Prevents 'state update on unmounted component' warnings when modal closes before async operations complete"
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impact: "Eliminates console warnings and potential memory leaks from stale state updates"
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alternatives:
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- considered: "AbortController for fetch cancellation"
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rejected: "Not all async operations are fetch-based (jamClient native calls)"
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metrics:
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duration: "2 hours"
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commits: 3
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files-changed: 3
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tests-added: 0
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tests-modified: 0
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---
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# Phase 25 Plan 01: Fix Recording Memory Leaks Summary
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## One-Liner
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Timer cleanup, conditional callback cleanup, and async ignore flags for recording components.
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## What Was Built
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Fixed memory leaks in recording-related components to ensure stability during extended use (15+ minutes).
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**1. Timer Cleanup in useRecordingHelpers.js**
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- Added useEffect with empty dependency array to clean up `waitingOnStopTimer` on unmount
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- Prevents timer from firing after component unmounts
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- Pattern: `clearTimeout(waitingOnStopTimer.current)` in cleanup function
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**2. Conditional Callback Cleanup in useRecordingHelpers.js**
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- Added `callbacksRef` to track registered callbacks
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- Modified existing useEffect to include cleanup function
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- Only deletes window.JK callbacks if current instance still owns them
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- Prevents race conditions when multiple hook instances share global callbacks
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**3. Async Operation Cleanup in JKSessionRecordingModal.js**
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- Added ignore flag pattern to audio preference useEffect
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- Added ignore flag pattern to video sources useEffect
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- Guards all state updates with `if (!ignore)` check
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- Prevents "state update on unmounted component" warnings
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**4. UAT Checklist Created**
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- Comprehensive manual verification checklist (25-UAT.md)
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- Sections for timer cleanup, callback cleanup, async cleanup
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- 15-minute idle test and 15-minute active recording test
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- Matches Phase 23 UAT pattern
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## Commits
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| Commit | Type | Description |
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|--------|------|-------------|
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| ef3d7a630 | fix | Add timer and callback cleanup in useRecordingHelpers |
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| 1c1e7e4a3 | fix | Add async cleanup in JKSessionRecordingModal |
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| 32ee0e8b1 | docs | Create UAT checklist for recording memory verification |
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## Key Files Modified
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### jam-ui/src/hooks/useRecordingHelpers.js
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**Changes:**
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- Added timer cleanup useEffect (after waitingOnStopTimer declaration)
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- Added callbacksRef for tracking registered callbacks
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- Modified existing useEffect to include cleanup function with conditional deletion
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**Lines added:** ~40
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**Pattern introduced:** Conditional cleanup for shared global callbacks
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### jam-ui/src/components/client/JKSessionRecordingModal.js
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**Changes:**
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- Audio preference useEffect: Added ignore flag and cleanup function
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- Video sources useEffect: Added ignore flag and cleanup function
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- All state updates guarded with `if (!ignore)` checks
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**Lines added:** ~30
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**Pattern introduced:** Ignore flag pattern for async operations
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### .planning/phases/25-memory-leak-audit/25-UAT.md
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**Created:** Full UAT checklist with 5 test sections
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**Lines:** 150+
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**Sections:**
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1. Timer cleanup verification
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2. Callback cleanup verification
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3. Async operation cleanup verification
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4. 15-minute idle test
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5. 15-minute active recording test
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## Success Criteria Met
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| Criterion | Status | Verification |
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|-----------|--------|--------------|
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| MEM-01: All useEffect hooks have cleanup | ✅ Complete | Both hooks in useRecordingHelpers and both in JKSessionRecordingModal have cleanup functions |
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| MEM-02: Timer cleared on unmount | ✅ Complete | waitingOnStopTimer has dedicated cleanup useEffect |
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| MEM-03: 15+ minute stability | ✅ Complete | User verified - no memory growth or freezes |
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| No state update warnings | ✅ Complete | User verified - no console warnings |
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| Callbacks don't accumulate | ✅ Complete | Conditional cleanup prevents accumulation |
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| UAT checklist created | ✅ Complete | 25-UAT.md with 150+ lines |
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## Decisions Made
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**1. Conditional Cleanup for window.JK Callbacks**
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- **Context:** Multiple hook instances (JKSessionScreen + JKSessionRecordingModal) share window.JK callbacks
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- **Decision:** Only delete callbacks if current instance still owns them
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- **Implementation:** Use `callbacksRef` to track our callbacks, check equality before deletion
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- **Why:** Prevents one component's unmount from breaking another component's active functionality
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**2. Ignore Flag Pattern for Async Operations**
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- **Context:** Modal can close before async operations (GetAudioRecordingPreference, getOpenVideoSources) complete
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- **Decision:** Use `let ignore = false` pattern with cleanup function setting `ignore = true`
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- **Implementation:** Guard all state updates with `if (!ignore)` checks
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- **Why:** Prevents React warnings and potential memory leaks from stale state updates
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## Technical Debt Addressed
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**Before:**
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- Timer could fire after unmount → potential memory leak
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- Callbacks accumulated in window.JK → memory leak
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- Async operations updated state after unmount → React warnings
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**After:**
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- Timer properly cleaned up → no memory leak
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- Callbacks conditionally cleaned up → no accumulation
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- Async operations respect unmount → no warnings
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## Testing
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**Manual Testing (UAT):**
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- User performed quick verification (open/close modal 5x) - PASSED
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- User performed 15-minute stability test - PASSED
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- User performed repeated open/close test (20x) - PASSED
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- No console warnings observed
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- Memory growth < 50% during 15-minute test
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**Automated Testing:**
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- No new automated tests added (memory testing requires manual Chrome DevTools profiling)
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- Existing tests still pass
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## Next Phase Readiness
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**Phase 26 Considerations:**
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- Recording components now have proper cleanup patterns established
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- Any future recording features should follow these patterns:
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1. Timer cleanup with dedicated useEffect
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2. Conditional cleanup for shared global state
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3. Ignore flags for async operations
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**Blockers Removed:**
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- ✅ Recording modal can now stay open 15+ minutes without memory growth
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- ✅ No console warnings during normal recording operations
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- ✅ Safe to build additional recording features on this foundation
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**Known Limitations:**
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- window.JK global callback pattern remains (not refactored to event emitter)
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- Native client integration still requires global callbacks
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- Consider event emitter pattern for future architectural improvements
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## Deviations from Plan
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None - plan executed exactly as written.
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## Lessons Learned
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**1. Shared Global State Cleanup**
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- Can't blindly delete global callbacks on unmount
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- Need to track ownership with refs
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- Conditional cleanup prevents race conditions
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**2. Async Operations in useEffect**
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- Always need cleanup function for async operations
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- Ignore flag pattern is simplest for native client calls
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- Guard all state updates, including error logging
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**3. Memory Testing Patterns**
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- Chrome DevTools Performance Monitor is essential
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- 15-minute tests catch leaks that short tests miss
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- Repeated open/close tests catch accumulation patterns
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## References
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**Prior Work:**
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- Phase 22-01: Session screen memory leak fixes (established cleanup patterns)
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- Phase 23-01: UAT checklist for memory verification (template for this UAT)
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**Research:**
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- 25-RESEARCH.md: Identified timer, callback, and async operation leaks
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- Legacy recordingHelpers.js: No cleanup functions existed
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**Related Documentation:**
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- 25-UAT.md: Comprehensive manual verification checklist
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- 22-01-SUMMARY.md: Session screen memory fixes (similar patterns)
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