The reports are what tell us which versions and cluster sizes are
actually in use, and almost nobody flips the flag on, so the numbers we
have are close to useless. Default it on for master, server and mini,
and say in the flag help and the startup log how to turn it off.
Nothing new is collected: still an in-memory cluster id that changes on
restart, version, os, server counts, volume count and disk bytes, sent
once a day by the leader master only.
* Prevent split-brain: Persistent ClusterID and Join Validation
- Persist ClusterId in Raft store to survive restarts.
- Validate ClusterId on Raft command application (piggybacked on MaxVolumeId).
- Prevent masters with conflicting ClusterIds from joining/operating together.
- Update Telemetry to report the persistent ClusterId.
* Refine ClusterID validation based on feedback
- Improved error message in cluster_commands.go.
- Added ClusterId mismatch check in RaftServer.Recovery.
* Handle Raft errors and support Hashicorp Raft for ClusterId
- Check for errors when persisting ClusterId in legacy Raft.
- Implement ClusterId generation and persistence for Hashicorp Raft leader changes.
- Ensure consistent error logging.
* Refactor ClusterId validation
- Centralize ClusterId mismatch check in Topology.SetClusterId.
- Simplify MaxVolumeIdCommand.Apply and RaftServer.Recovery to rely on SetClusterId.
* Fix goroutine leak and add timeout
- Handle channel closure in Hashicorp Raft leader listener.
- Add timeout to Raft Apply call to prevent blocking.
* Fix deadlock in legacy Raft listener
- Wrap ClusterId generation/persistence in a goroutine to avoid blocking the Raft event loop (deadlock).
* Rename ClusterId to SystemId
- Renamed ClusterId to SystemId across the codebase (protobuf, topology, server, telemetry).
- Regenerated telemetry.pb.go with new field.
* Rename SystemId to TopologyId
- Rename to SystemId was intermediate step.
- Final name is TopologyId for the persistent cluster identifier.
- Updated protobuf, topology, raft server, master server, and telemetry.
* Optimize Hashicorp Raft listener
- Integrated TopologyId generation into existing monitorLeaderLoop.
- Removed extra goroutine in master_server.go.
* Fix optimistic TopologyId update
- Removed premature local state update of TopologyId in master_server.go and raft_hashicorp.go.
- State is now solely updated via the Raft state machine Apply/Restore methods after consensus.
* Add explicit log for recovered TopologyId
- Added glog.V(0) info log in RaftServer.Recovery to print the recovered TopologyId on startup.
* Add Raft barrier to prevent TopologyId race condition
- Implement ensureTopologyId helper method
- Send no-op MaxVolumeIdCommand to sync Raft log before checking TopologyId
- Ensures persisted TopologyId is recovered before generating new one
- Prevents race where generation happens during log replay
* Serialize TopologyId generation with mutex
- Add topologyIdGenLock mutex to MasterServer struct
- Wrap ensureTopologyId method with lock to prevent concurrent generation
- Fixes race where event listener and manual leadership check both generate IDs
- Second caller waits for first to complete and sees the generated ID
* Add TopologyId recovery logging to Apply method
- Change log level from V(1) to V(0) for visibility
- Log 'Recovered TopologyId' when applying from Raft log
- Ensures recovery is visible whether from snapshot or log replay
- Matches Recovery() method logging for consistency
* Fix Raft barrier timing issue
- Add 100ms delay after barrier command to ensure log application completes
- Add debug logging to track barrier execution and TopologyId state
- Return early if barrier command fails
- Prevents TopologyId generation before old logs are fully applied
* ensure leader
* address comments
* address comments
* redundant
* clean up
* double check
* refactoring
* comment
Chris LuandGitHub
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