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eth/downloader: fix the stall checks/drops during sync

This commit is contained in:
Péter Szilágyi 2016-07-22 17:55:46 +03:00
parent f58ac2b46b
commit c7c82f1b44
1 changed files with 8 additions and 1 deletions
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9
eth/downloader/downloader.go
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@ -1555,7 +1555,14 @@ func (d *Downloader) fetchParts(errCancel error, deliveryCh chan dataPack, deliv
// Check for fetch request timeouts and demote the responsible peers
for pid, fails := range expire() {
if peer := d.peers.Peer(pid); peer != nil {
if fails > 1 {
// If a lot of retrieval elements expired, we might have overestimated the remote peer or perhaps
// ourselves. Only reset to minimal throughput but don't drop just yet. If even the minimal times
// out that sync wise we need to get rid of the peer.
//
// The reason the minimum threshold is 2 is because the downloader tries to estimate the bandwidth
// and latency of a peer separately, which requires pushing the measures capacity a bit and seeing
// how response times reacts, to it always requests one more than the minimum (i.e. min 2).
if fails > 2 {
glog.V(logger.Detail).Infof("%s: %s delivery timeout", peer, strings.ToLower(kind))
setIdle(peer, 0)
} else {