Replace K8s Lease leader election with OpenRaft consensus#84
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Replace the Kubernetes-specific leader election (K8s Lease API) with OpenRaft-based consensus that works identically on bare-metal and Kubernetes. Closes #82. The existing WAL operations map directly to Raft log entries, making the integration natural. When `controller.peers` is configured, spurctld forms a Raft cluster for automatic leader election and state replication. Without peers, single-node mode works exactly as before. Changes: - New `raft.rs` module implementing OpenRaft storage, state machine, and network traits using the existing WalOperation type - Config: added `peers` and `node_id` to ControllerConfig - Removed `leader_election.rs` (K8s Lease-based, 172 lines) - Removed `kube` and `k8s-openapi` dependencies from spurctld - Removed `--enable-leader-election` and `--election-namespace` flags - Network transport returns Unreachable for now (gRPC transport implementation is the next step for multi-node testing) Configuration: [controller] peers = ["node1:6817", "node2:6817", "node3:6817"] node_id = 1 # optional, auto-assigned from peers list Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Replace Test 7 (K8s Lease leader election) with a single-node mode verification, since leader election now uses Raft consensus instead of K8s Leases. Remove Lease RBAC rule from operator role. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
The spurctld container doesn't have curl installed. Check pod Running status instead. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
The openraft dependency adds enough crates that unrestricted parallel compilation hits the file descriptor limit in CI Docker builders. Cap CARGO_BUILD_JOBS=4 to prevent "too many open files" errors. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Summary
peersconfigured) behaves exactly as beforeChanges
raft.rs: OpenRaft type config, in-memory log/state stores, network stubs. UsesWalOperationas the Raft log entry type (same as existing WAL)leader_election.rs: K8s Lease-based election (172 lines removed)kubeandk8s-openapidependencies from spurctld--enable-leader-electionand--election-namespaceCLI flagspeers(list of peer addresses) andnode_idto[controller]Configuration
Architecture
WalOperation→ Raft log entries (natural mapping)apply()→ calls samereplay_entry()as WAL recoveryTest plan
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