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@@ -1044,7 +1044,14 @@ func (d *Downloader) fetchParts(errCancel error, deliveryCh chan dataPack, deliv
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// Check for fetch request timeouts and demote the responsible peers
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for pid, fails := range expire() {
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if peer := d.peers.Peer(pid); peer != nil {
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- if fails > 1 {
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+ // If a lot of retrieval elements expired, we might have overestimated the remote peer or perhaps
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+ // ourselves. Only reset to minimal throughput but don't drop just yet. If even the minimal times
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+ // out that sync wise we need to get rid of the peer.
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+ //
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+ // The reason the minimum threshold is 2 is because the downloader tries to estimate the bandwidth
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+ // and latency of a peer separately, which requires pushing the measures capacity a bit and seeing
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+ // how response times reacts, to it always requests one more than the minimum (i.e. min 2).
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+ if fails > 2 {
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glog.V(logger.Detail).Infof("%s: %s delivery timeout", peer, strings.ToLower(kind))
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setIdle(peer, 0)
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} else {
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Felix Lange