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Release 0.5.32

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@StevenBtw StevenBtw released this 04 Apr 09:21
· 293 commits to main since this release
v0.5.32
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[0.5.32] - 2026-04-04

Replication correctness: atomic batch replay, read-only replica enforcement, HLC timestamps, Maelstrom and Jepsen testing.

Changed

  • Atomic sync apply: SyncService::apply() now wraps all mutations in a session transaction for all-or-nothing visibility. Readers on replicas never see partial batch state. Uses new session CRUD methods (set_node_property, delete_node, etc.) for transactional property updates and deletions
  • Persistent replica epoch: ReplicationState::with_persistence(data_dir) saves per-database epoch to {data_dir}/.replica-epochs on each advance. Replicas resume from their last position after restart instead of re-fetching from epoch 0
  • HLC timestamp comparison: server_is_newer() now explicitly converts u64 client timestamps to HlcTimestamp for type-safe comparison, compatible with grafeo-engine 0.5.32's HLC-based CDC timestamps
  • grafeo-engine 0.5.32: CDC opt-in per session (set_cdc_enabled, session_with_cdc), Hybrid Logical Clock for causal consistency, GrafeoDB::compact() columnar read-only store, session CRUD methods, Gremlin valueMap()/elementMap(), sibling CALL block scope fix, push-based aggregator hash collision fix, Cypher ORDER BY zero fix
  • CDC auto-activation: server automatically enables CDC on all databases when running as a replication primary, ensuring all mutations (both direct API and session-driven) produce change events

Added

  • Replication integration tests: end-to-end primary-to-replica data flow tests via SyncService::pull() + apply(), including session-driven mutations (INSERT/SET/DELETE via GQL), epoch persistence roundtrip
  • ReplicationMode::is_primary() accessor: complements is_replica() for symmetric replication mode checks
  • Engine-level read-only on replicas: QueryService creates read-only sessions on replicas via session_read_only(), preventing mutations through POST /query across all transports (HTTP, GWP, BoltR). Previously only PUT/PATCH/DELETE were blocked by middleware
  • ServiceState::is_query_read_only(): combines global read-only flag with replica detection for all transports
  • Maelstrom consistency test node (crates/grafeo-maelstrom): standalone Rust binary implementing Maelstrom's lin-kv protocol with primary-replica replication model, write/CAS forwarding, LWW conflict resolution, and HLC timestamps. Run with maelstrom test -w lin-kv --consistency-models read-uncommitted
  • Jepsen test harness (jepsen/): Clojure project for Docker-based chaos testing with network partition (docker pause) and crash (docker kill) nemeses, eventual consistency checker

Full Changelog: v0.5.30...v0.5.32

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