propose architecture change for fullnode
This commit is contained in:
Pankaj Garg
Grimes
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.----------------------------------.
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| Fullnode |
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| |
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.--------. | .------------------. |
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| |---->| | |
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| Client | | | JSON RPC Service | |
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| |<----| | |
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`----+---` | `------------------` |
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| | ^ |
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| | | .----------------. | .------------------.
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| | | | Gossip Service |<------>| Validators |
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| | | `----------------` | | |
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| | | ^ | | |
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| | | | | | .------------. |
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| | .--+---. .--+---. .---------. | | | | |
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| | | Bank |<-|Replay| | Peer TX |<-----+ Upstream | |
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| | | Forks| |Stage | | Receiver| | | | Validators | |
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| | `------` `------` `-+-------` | | | | |
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| | ^ ^ | | | `------------` |
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| | | | v | | |
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| | | .-+-------. | | |
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| | | |Blocktree| | | |
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| | | `---------` | | .------------. |
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| | | ^ | | | | |
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| | | | | | | Downstream | |
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| | .--+--. .-------+---. | | | Validators | |
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`-------->| TPU +-->| Broadcast +------------->| | |
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| `-----` | Service | | | `------------` |
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| `-----------` | `------------------`
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`----------------------------------`
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@ -1,4 +1,4 @@
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.---------------------------------.
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.---------------------------.
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| Fullnode |
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| |
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.--------. | .------------------. |
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@ -6,25 +6,22 @@
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| Client | | | JSON RPC Service | |
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| |<----| | |
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`----+---` | `------------------` |
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| | ^ |
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| | | .----------------. | .------------------.
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| | | | Gossip Service |<------>| Validators |
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| | | `----------------` | | |
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| | | | | |
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| | ^ | .------------------.
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| | | .----------------. | | Validators |
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| | | | Gossip Service +----->| |
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| | | `--------+-------` | | .------------. |
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| | | ^ | | | | | |
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| | | | v | | | Upstream | |
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| | .--+---. .-+---. | | | Validators | |
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| | | Bank |<--| TVU |<--------------+ | |
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| | `------` `-----` | | `------------` |
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| | ^ | | |
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| | | | | .------------. |
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| | .--+---. .------. .--------. | | | | |
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| | | Bank |<-|Replay| |Network |<------+ Upstream | |
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| | | Forks| |Stage | |Observer| | | | Validators | |
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| | `------` `--+---` `------+-` | | | | |
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| | ^ | ^ | | | `------------` |
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| | | .------ | | | | | |
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| | | |Gossip|<-`.-+-------. | | | |
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| | | |Votes | |Blocktree|<-` | | |
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| | | `-+----` `---------` | | .------------. |
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| | | | ^ | | | | |
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| | | v | | | | Downstream | |
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| | .+----. .------+----. | | | Validators | |
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`-------->| TPU +-->| Broadcast +------------->| | |
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| `-----` | Service | | | `------------` |
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| `-----------` | `------------------`
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`---------------------------------`
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| | .--+--. .-----------. | | | | |
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`-------->| TPU +-->| Broadcast +--------->| Downstream | |
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| `-----` | Service | | | | Validators | |
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| `-----------` | | | | |
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| | | `------------` |
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`---------------------------` | |
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`------------------`
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@ -36,6 +36,7 @@
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- [Data Plane Fanout](data-plane-fanout.md)
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- [Reliable Vote Transmission](reliable-vote-transmission.md)
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- [Bank Forks](bank-forks.md)
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- [Fullnode Changes](fullnode-with-ledger-notifications.md)
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- [Cluster Economics](ed_overview.md)
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- [Validation-client Economics](ed_validation_client_economics.md)
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- [State-validation Protocol-based Rewards](ed_vce_state_validation_protocol_based_rewards.md)
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# Fullnode
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This document proposes the following architecture changes to fullnode pipeline.
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## Current Architecture
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<img alt="Fullnode block diagrams" src="img/fullnode.svg" class="center"/>
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## Proposal
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<img alt="Fullnode block diagrams" src="img/fullnode-proposal.svg" class="center"/>
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## Background
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In the old architecture, the ReplayStage receives entries from the RetransmitStage,
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processes them and writes to the ledger.
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In the current code, the ledger write operation has been moved out of the ReplayStage.
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If the fullnode is running with a TPU, the Broadcast Service writes to the ledger.
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The Retransmit Stage receives entries from peer fullnodes and also writes to the ledger.
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The ledger notifies the ReplayStage whenever some entity writes to it. The
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ReplayStage reads from the ledger, processes the entries in the bank and submits
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the votes.
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In old architecture, the RetransmitStage and ReplayStage are contained in the TVU.
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## Changes
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This document proposes the following change to the architecture.
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1. Split TVU into Peer Transaction Receiver (contains BlobFetchStage, and RetransmitStage)
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2. Add Blocktree (ledger) to the diagram
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3. The Blocktree is updated by Broadcast Stage and Peer Transaction Receiver
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4. Replay Stage gets notified by Blocktree when someone writes to it
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5. Replay Stage submits votes via Gossip Service
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6. Replace Bank with BankForks
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