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eth/downloader: fix header delays during chain dedup

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Péter Szilágyi 2019-05-07 16:09:11 +03:00
parent 107c67d74e
commit 85726fdb02
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1 changed files with 7 additions and 0 deletions
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7
eth/downloader/downloader.go
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@ -892,6 +892,7 @@ func (d *Downloader) fetchHeaders(p *peerConnection, from uint64, pivot uint64)
} }
} }
// Start pulling the header chain skeleton until all is done // Start pulling the header chain skeleton until all is done
ancestor := from
getHeaders(from) getHeaders(from)
for { for {
@ -962,6 +963,12 @@ func (d *Downloader) fetchHeaders(p *peerConnection, from uint64, pivot uint64)
head = full head = full
} }
} }
// If the head is below the common ancestor, we're actually deduplicating
// already existing chain segments, so use the ancestor as the fake head.
// Otherwise we might end up delaying header deliveries pointlessly.
if head < ancestor {
head = ancestor
}
// If the head is way older than this batch, delay the last few headers // If the head is way older than this batch, delay the last few headers
if head+uint64(reorgProtThreshold) < headers[n-1].Number.Uint64() { if head+uint64(reorgProtThreshold) < headers[n-1].Number.Uint64() {
delay := reorgProtHeaderDelay delay := reorgProtHeaderDelay