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[Docs] Add PoS downloader diagram #4084

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May 6, 2022
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[Docs] Add PoS downloader diagram #4084

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a37967f
Extra comment for HeadersPOS
yperbasis May 3, 2022
387197f
Add PoS downloader diagram
yperbasis May 5, 2022
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1 change: 1 addition & 0 deletions docs/pos_downloader.drawio
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5 changes: 5 additions & 0 deletions eth/stagedsync/README.md
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Expand Up @@ -58,6 +58,11 @@ So, when we are generating indexes or hashed state, we do a multi-step process.

This optimization sometimes leads to dramatic (orders of magnitude) write speed improvements.

## What happens after the Merge?

In the Proof-of-Stake world staged sync becomes somewhat more complicated, as the following diagram shows.
![](/docs/pos_downloader.png)

## Stages (for the up to date list see [`stagedsync.go`](/eth/stagedsync/stagedsync.go) and [`stagebuilder.go`](/eth/stagedsync/stagebuilder.go)):

Each stage consists of 2 functions `ExecFunc` that progesses the stage forward and `UnwindFunc` that unwinds the stage backwards.
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3 changes: 2 additions & 1 deletion eth/stagedsync/stage_headers.go
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Expand Up @@ -138,7 +138,8 @@ func SpawnStageHeaders(
}
}

// HeadersPOS processes Proof-of-Stake requests (newPayload, forkchoiceUpdated)
// HeadersPOS processes Proof-of-Stake requests (newPayload, forkchoiceUpdated).
// It also saves PoS headers downloaded by (*HeaderDownload)StartPoSDownloader into the DB.
func HeadersPOS(
s *StageState,
u Unwinder,
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