feat(cluster): distributed cluster infrastructure#45

Merged

farhan-syah merged 24 commits intomainfrom

Apr 16, 2026

Commits on Apr 16, 2026

chore: bump workspace version to 0.0.4
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feat(swim): add MembershipSubscriber hook for state transition events
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feat(cluster): invalidate routing leader hints on SWIM liveness events
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feat(cluster): add graceful node decommission
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feat(cluster): add reachability-driven circuit-breaker recovery
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docs(cluster): remove stale phase-label references from swim comments
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feat(cluster): add load-based rebalancer with metrics, planning, and driver loop
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fix(cluster): correct migration learner promotion and replicated Phase 3 cut-over
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feat(cluster): trigger rebalancer sweep on SWIM membership changes
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feat(cluster): add SHOW RANGES, SHOW ROUTING, and SHOW SCHEMA VERSION commands
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feat(http): add /health/live and /health/drain endpoints
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fix(pgwire): wire pg_catalog dispatch into query handler and fix rebalancer test lock scope
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feat(rebalancer): add CPU backpressure gate to pause sweeps under load
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feat(pgwire): add nodedb.read_consistency session parameter
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feat(pgwire): implement pg_catalog virtual table handler
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feat(cluster): add closed timestamp tracker and follower read gate
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fix(pgwire): guard against out-of-bounds access in DDL command parsers
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feat(nodedb-sql): add typed DDL AST module
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feat(nodedb-cluster): add MetadataEntry::Batch for atomic DDL replication
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feat(pgwire): implement transactional DDL with AST-based dispatch
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test(nodedb): add DDL replication correctness tests
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fix(raft): deduplicate votes by peer ID and make election timeout configurable
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feat(cluster): start health monitor and harden topology convergence
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test(cluster): replace fixed sleeps with readiness polling and fix SWIM probe test
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