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Architecture Review: Leader Election Watch Channel Design (v0.2.0) #209
Description
Context
This ticket is for comprehensive architecture review of the leader election watch
channel design in Node struct (v0.2.0 release).
Current implementation uses watch::channel with a kept-alive receiver (_leader_elected_rx)
to prevent channel closure.
Scope
- Analyze current design: watch::channel + kept-alive rx pattern
- Review tokio watch channel lifecycle semantics
- Evaluate performance implications (ns-level precision)
- Determine if lazy subscription is needed
- Evaluate broadcast::channel as alternative
- Consider resource overhead when no subscribers exist
- Document final architecture decision
Key Questions
- Performance: watch vs broadcast vs other approaches?
- Resource efficiency: Should system compute when no subscribers exist?
- API clarity: Does _leader_elected_rx pattern make sense semantically?
- Simplicity: Can we simplify without sacrificing performance?
Acceptance Criteria
- Architecture decision documented
- Performance characteristics understood
- Implementation plan (if changes needed) agreed upon
Activity
fix #209: Fix node restart wait_ready() timeout due to leader notific…
fix #209: Fix flaky tests due to timing issues and missing rocksdb fe…
doc #209: Fix broken intra-doc links and CI cargo-nextest version
refactor #209: Simplify StateMachine init and expand API test coverage
refactor #209: Architecture review - consolidate tests, improve API, …
refactor #209: Simplify node-join architecture doc and fix doc links
test #209: Add integration test scaffold for Analytics node (Learner …
feat(raft) #213: Implement READ_ONLY Learner nodes for permanent anal…
fix(test) #209: Remove outdated mock expectations in leader promotion…
fix(test) #209: Remove outdated mock expectations in leader promotion…
fix(docs) #209: Fix code block syntax in documentation to pass doctests
fix(docs) #209: Fix missing file references and apply code formatting
fix #209: Apply cargo +nightly fmt for import order and code style co…
fix(docs) #209: Fix documentation build errors and doctest failures
refactor(docs) #209: Replace real-world-examples with use-cases guide
refactor(docs) #209: Improve standalone quick-start and fix demo build
refactor(docs) #209: Clean up documentation for v0.2.0 release
refactor(raft) #209: Architecture review - consolidate v0.2.0 improve…
feat #204: Release v0.2.0 - Production-ready distributed coordination…
chore #248: Release v0.2.2