feat(shard-distributor): add SpectatorPeerChooser for shard-aware routing #7478
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jakobht
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Previously GetShardOwner only returned the executor ID string. Now it returns an ExecutorOwnership struct containing both the executor ID and the full metadata map. This allows callers to access additional executor information like the gRPC address needed for peer routing. Changes: - Add ExecutorOwnership struct with ExecutorID and Metadata fields - Update GetShardOwner signature to return *ExecutorOwnership - Update spectatorImpl to build and return ownership info - Update tests to verify metadata is included in responses Signed-off-by: Jakob Haahr Taankvist <[email protected]>
Use BlockUntil() to properly synchronize with the fake clock before advancing time. This prevents the test from hanging while waiting for the goroutine to process the time advancement. Signed-off-by: Jakob Haahr Taankvist <[email protected]>
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Encapsulate the spectators map in a struct to hide implementation details and make it easier to extend in the future without breaking the API. Signed-off-by: Jakob Haahr Taankvist <[email protected]>
Implement a YARPC peer chooser that routes requests to the correct
executor based on shard ownership. This is the shard distributor
equivalent of Cadence's RingpopPeerChooser.
Flow:
1. Client calls RPC with yarpc.WithShardKey("shard-key")
2. Chooser queries Spectator for shard owner
3. Extracts grpc_address from owner metadata
4. Creates/reuses peer for that address
5. Returns peer to YARPC for connection
The peer chooser maintains a cache of peers and handles concurrent
access safely. It uses the x-shard-distributor-namespace header to
determine which namespace's spectator to query.
Dependencies:
- Requires spectator GetShardOwner to return metadata (see previous commit)
Signed-off-by: Jakob Haahr Taankvist <[email protected]>
Signed-off-by: Jakob Haahr Taankvist <[email protected]>
The tests have dependency issues with mock generation that need to be resolved separately. The peer chooser implementation is complete and functional. Signed-off-by: Jakob Haahr Taankvist <[email protected]>
Tests cover: - Success path with peer creation - Peer reuse on subsequent calls - Error cases (missing shard key, namespace header, spectator not found) - Lifecycle methods (Start, Stop, IsRunning) - SetSpectators method Signed-off-by: Jakob Haahr Taankvist <[email protected]>
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This PR depends on #7476 (spectator return metadata) being merged first.
What changed?
Added
SpectatorPeerChooserthat implements YARPC's peer.Chooser interface to route requests to the correct executor based on shard ownership.Why?
Enable executor-to-executor communication in the shard distributor canary system. The peer chooser queries the Spectator to find which executor owns a shard, then routes requests to that executor's gRPC address.
How did you test it?
Unit tests
Potential risks
None
Release notes
Documentation Changes