Update nclprotocol readme with seqNum exchange changes #4779
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WalkthroughThe documentation for the NCL (Node Communication Layer) Protocol has been comprehensively updated to provide more detailed insights into sequence number management, connection lifecycle, and failure recovery processes. The changes focus on clarifying how orchestrators and compute nodes track message processing, manage connections, and handle potential failures. The documentation now offers a more in-depth explanation of the protocol's mechanisms, including how sequence numbers are tracked, how handshakes are performed, and how the system recovers from potential communication disruptions. Changes
Sequence DiagramsequenceDiagram
participant Orchestrator
participant ComputeNode
Orchestrator->>ComputeNode: HandshakeRequest
Note over Orchestrator: Determines starting sequence
ComputeNode->>Orchestrator: HandshakeResponse
loop Periodic Communication
ComputeNode->>Orchestrator: HeartbeatRequest
Note over ComputeNode: Includes last processed sequence
Orchestrator->>ComputeNode: Acknowledge
end
alt Connection Failure
Orchestrator--xComputeNode: Detect Failure
Orchestrator->>ComputeNode: Reconnect
Note over Orchestrator,ComputeNode: Resume with last known sequence
end
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Actionable comments posted: 0
🧹 Nitpick comments (5)
pkg/transport/nclprotocol/README.md (5)
88-107: Enhance sequence number management documentationThe new section provides valuable insights into sequence number tracking. Consider enhancing it with:
- The format/structure of sequence numbers (e.g., uint64, starting value)
- How sequence numbers relate to message ordering guarantees
- Handling of sequence number overflow scenarios
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🪛 LanguageTool
[uncategorized] ~99-~99: You might be missing the article “the” here.
Context: ...ks which messages it has processed from orchestrator - Reports progress through periodic ...(AI_EN_LECTOR_MISSING_DETERMINER_THE)
173-173: Clarify LastOrchestratorSeqNum usage in commentsThe comment "For reference only" on
LastOrchestratorSeqNuminHandshakeRequestmight be misleading since this value is used by the orchestrator to determine the starting sequence for reconnecting nodes. Consider updating both comments to be more precise about their usage:- LastOrchestratorSeqNum: uint64 // For reference only + LastOrchestratorSeqNum: uint64 // Used by orchestrator to determine starting sequence for reconnecting nodesAlso applies to: 193-193
229-233: Enhance sequence number exchange visualization in diagramsThe sequence diagrams could better illustrate the sequence number exchange process. Consider adding:
- Sequence number fields in the message arrows
- Notes showing how each side updates its sequence tracking
- Visual representation of the sequence state storage and recovery
Example enhancement for the handshake diagram:
sequenceDiagram participant C as Compute Node participant O as Orchestrator Note over C,O: Connection Establishment C->>O: HandshakeRequest(LastOrchestratorSeqNum=X) Note over O: Load stored sequence state Note over O: Validate sequence numbers O-->>C: HandshakeResponse(StartingOrchestratorSeqNum=Y) Note over C: Resume from sequence YAlso applies to: 260-260, 282-282, 313-314
340-344: Clarify message delivery guarantees and handlingThe protocol guarantees section could be more specific about:
- Implications of "at-least-once delivery" for applications
- How applications should handle potential duplicate messages
- Best practices for deduplication if needed
99-99: Fix grammar: Add missing article- Tracks which messages it has processed from orchestrator + Tracks which messages it has processed from the orchestrator🧰 Tools
🪛 LanguageTool
[uncategorized] ~99-~99: You might be missing the article “the” here.
Context: ...ks which messages it has processed from orchestrator - Reports progress through periodic ...(AI_EN_LECTOR_MISSING_DETERMINER_THE)
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pkg/transport/nclprotocol/README.md(11 hunks)
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🪛 LanguageTool
pkg/transport/nclprotocol/README.md
[uncategorized] ~99-~99: You might be missing the article “the” here.
Context: ...ks which messages it has processed from orchestrator - Reports progress through periodic ...
(AI_EN_LECTOR_MISSING_DETERMINER_THE)
🔇 Additional comments (1)
pkg/transport/nclprotocol/README.md (1)
135-137: 🛠️ Refactor suggestion
Document sequence number validation during reconnection
Consider documenting how the orchestrator handles cases where a reconnecting node reports a sequence number that's unexpectedly higher than the orchestrator's last known sequence. This could indicate potential data loss or corruption.
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