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[Docs] Add PoS downloader diagram (#4084)
* Extra comment for HeadersPOS * Add PoS downloader diagram
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docs/pos_downloader.png
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@ -58,6 +58,11 @@ So, when we are generating indexes or hashed state, we do a multi-step process.
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This optimization sometimes leads to dramatic (orders of magnitude) write speed improvements.
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## What happens after the Merge?
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In the Proof-of-Stake world staged sync becomes somewhat more complicated, as the following diagram shows.
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![](/docs/pos_downloader.png)
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## Stages (for the up to date list see [`stagedsync.go`](/eth/stagedsync/stagedsync.go) and [`stagebuilder.go`](/eth/stagedsync/stagebuilder.go)):
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Each stage consists of 2 functions `ExecFunc` that progesses the stage forward and `UnwindFunc` that unwinds the stage backwards.
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@ -141,7 +141,8 @@ func SpawnStageHeaders(
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}
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}
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// HeadersPOS processes Proof-of-Stake requests (newPayload, forkchoiceUpdated)
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// HeadersPOS processes Proof-of-Stake requests (newPayload, forkchoiceUpdated).
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// It also saves PoS headers downloaded by (*HeaderDownload)StartPoSDownloader into the DB.
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func HeadersPOS(
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s *StageState,
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u Unwinder,
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