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eth/downloader: fix #2841 spikes by block fetches

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Ignore a reportedly higher total difficulty when a
peer's best block is already present in local chain.
Makes robust against inaccurately reported height or
total difficulty.
This commit is contained in:
Henning Diedrich 2016-07-21 11:52:18 +02:00
parent f273c64a94
commit 82199692b0
1 changed files with 8 additions and 0 deletions
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8
eth/downloader/downloader.go
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@ -412,6 +412,14 @@ func (d *Downloader) syncWithPeer(p *peer, hash common.Hash, td *big.Int) (err e
) )
case p.version >= 62: case p.version >= 62:
// essentially double check the peer-reported height. If its
// block at that height turns out to already be in our chain,
// stop search and ignore the alleged higher total difficulty
if d.hasBlockAndState(p.head) {
glog.Infof("%v: advertised a head already in our chain. Ignoring reported higher total difficulty", p)
return nil
}
// Look up the sync boundaries: the common ancestor and the target block // Look up the sync boundaries: the common ancestor and the target block
latest, err := d.fetchHeight(p) latest, err := d.fetchHeight(p)
if err != nil { if err != nil {