Extend ApplyEntry in JetStreamMetaGroup with PeerAdd/PeerRemove dispatch
to the existing Task 12 peer management methods. Add StreamMsgOp (Store,
Remove, Purge) and ConsumerOp (Ack, Nak, Deliver, Term, Progress) enums
plus ApplyStreamMsgOp and ApplyConsumerEntry methods to StreamReplicaGroup.
Extend ApplyCommittedEntriesAsync to parse smsg:/centry: command prefixes
and route to the new apply methods. Add MetaEntryType.PeerAdd/PeerRemove
enum values. 35 new tests in EntryApplicationTests.cs, all passing.
Add ProcessLeaderChange(bool) method and OnLeaderChange event to JetStreamMetaGroup.
Refactor StepDown() to delegate inflight clearing through ProcessLeaderChange,
enabling subscribers to react to leadership transitions.
Go reference: jetstream_cluster.go:7001-7074 processLeaderChange.
Replace the simple string-keyed inflight dictionaries with account-scoped
ConcurrentDictionary<string, Dictionary<string, InflightInfo>> structures.
Adds InflightInfo record with OpsCount for duplicate proposal tracking,
TrackInflight/RemoveInflight/IsInflight methods for streams and consumers,
and ClearAllInflight(). Updates existing Propose* methods to use $G account.
Go reference: jetstream_cluster.go:1193-1278.
Add 5 validated Process* methods to JetStreamMetaGroup for stream and
consumer assignment processing: ProcessStreamAssignment, ProcessUpdateStreamAssignment,
ProcessStreamRemoval, ProcessConsumerAssignment, and ProcessConsumerRemoval.
Each returns a bool indicating success, with validation guards matching
Go reference jetstream_cluster.go:4541-5925. Includes 12 new unit tests.
Implements the background loop (Go: monitorCluster) that reads RaftLogEntry
items from a channel and dispatches assignStream, removeStream, assignConsumer,
removeConsumer, and snapshot operations to JetStreamMetaGroup.
- Add five public mutation helpers to JetStreamMetaGroup (AddStreamAssignment,
RemoveStreamAssignment, AddConsumerAssignment, RemoveConsumerAssignment,
ReplaceAllAssignments) used by the monitor path
- JetStreamClusterMonitor: async loop over ChannelReader<RaftLogEntry>, JSON
dispatch, ILogger injection with NullLogger default, malformed entries logged
and skipped rather than aborting the loop
- WaitForProcessedAsync uses Monitor.PulseAll for race-free test synchronisation
with no Task.Delay — satisfies slopwatch SW003/SW004 rules
- 10 new targeted tests all pass; 1101 cluster regression tests unchanged
Implements binary codec for meta-group snapshots: 2-byte little-endian version
header followed by S2-compressed JSON of the stream assignment map. Adds
[JsonObjectCreationHandling(Populate)] to StreamAssignment.Consumers so the
getter-only dictionary is populated in-place during deserialization. 8 tests
covering round-trip, compression ratio, field fidelity, multi-consumer restore,
version rejection, and truncation guard.
Go reference: jetstream_cluster.go:2075-2145 (encodeMetaSnapshot/decodeMetaSnapshot)
Re-enabled the leader check in JetStreamApiRouter.Route() that was
commented out during B8 agent work. Added BecomeLeader() method to
JetStreamMetaGroup for single-process test fixtures to simulate
winning the post-stepdown election. MetaControllerFixture now
auto-calls BecomeLeader() after a successful meta leader stepdown.
- RaftGroup, StreamAssignment, ConsumerAssignment types matching Go structs
(jetstream_cluster.go:154-266)
- PlacementEngine.SelectPeerGroup: topology-aware peer selection with cluster
affinity, tag filtering, exclude tags, and storage-weighted sorting
(Go ref: selectPeerGroup at line 7212)
- JetStreamMetaGroup: backward-compatible rewrite with full assignment tracking,
consumer proposal workflow, and delete operations
- 41 new tests in ClusterAssignmentAndPlacementTests
- ProposeAddPeerAsync/ProposeRemovePeerAsync: single-change-at-a-time membership
changes through RAFT consensus (Go ref: raft.go:961-1019)
- RaftLog.Compact: removes entries up to given index for log compaction
- CreateSnapshotCheckpointAsync: creates snapshot and compacts log in one operation
- DrainAndReplaySnapshotAsync: drains commit queue, installs snapshot, resets indices
- Pre-vote protocol skipped (Go NATS doesn't implement it either)
- 23 new tests in RaftMembershipAndSnapshotTests
