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eth/downloader: fetch data proportionally to peer capacity

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This commit is contained in:
Péter Szilágyi
2015-10-29 18:37:26 +02:00
parent 4c2933ad82
commit b6f5523bdc
3 changed files with 257 additions and 245 deletions
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178
eth/downloader/downloader.go
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@ -45,16 +45,17 @@ var (
MaxReceiptFetch = 256 // Amount of transaction receipts to allow fetching per request
MaxStateFetch = 384 // Amount of node state values to allow fetching per request
hashTTL = 5 * time.Second // [eth/61] Time it takes for a hash request to time out
blockSoftTTL = 3 * time.Second // [eth/61] Request completion threshold for increasing or decreasing a peer's bandwidth
blockHardTTL = 3 * blockSoftTTL // [eth/61] Maximum time allowance before a block request is considered expired
headerTTL = 5 * time.Second // [eth/62] Time it takes for a header request to time out
bodySoftTTL = 3 * time.Second // [eth/62] Request completion threshold for increasing or decreasing a peer's bandwidth
bodyHardTTL = 3 * bodySoftTTL // [eth/62] Maximum time allowance before a block body request is considered expired
receiptSoftTTL = 3 * time.Second // [eth/63] Request completion threshold for increasing or decreasing a peer's bandwidth
receiptHardTTL = 3 * receiptSoftTTL // [eth/63] Maximum time allowance before a receipt request is considered expired
stateSoftTTL = 2 * time.Second // [eth/63] Request completion threshold for increasing or decreasing a peer's bandwidth
stateHardTTL = 3 * stateSoftTTL // [eth/63] Maximum time allowance before a node data request is considered expired
hashTTL = 3 * time.Second // [eth/61] Time it takes for a hash request to time out
blockTargetRTT = 3 * time.Second / 2 // [eth/61] Target time for completing a block retrieval request
blockTTL = 3 * blockTargetRTT // [eth/61] Maximum time allowance before a block request is considered expired
headerTTL = 3 * time.Second // [eth/62] Time it takes for a header request to time out
bodyTargetRTT = 3 * time.Second / 2 // [eth/62] Target time for completing a block body retrieval request
bodyTTL = 3 * bodyTargetRTT // [eth/62] Maximum time allowance before a block body request is considered expired
receiptTargetRTT = 3 * time.Second / 2 // [eth/63] Target time for completing a receipt retrieval request
receiptTTL = 3 * receiptTargetRTT // [eth/63] Maximum time allowance before a receipt request is considered expired
stateTargetRTT = 2 * time.Second / 2 // [eth/63] Target time for completing a state trie retrieval request
stateTTL = 3 * stateTargetRTT // [eth/63] Maximum time allowance before a node data request is considered expired
maxQueuedHashes = 256 * 1024 // [eth/61] Maximum number of hashes to queue for import (DOS protection)
maxQueuedHeaders = 256 * 1024 // [eth/62] Maximum number of headers to queue for import (DOS protection)
@ -486,7 +487,7 @@ func (d *Downloader) fetchHeight61(p *peer) (uint64, error) {
// Request the advertised remote head block and wait for the response
go p.getBlocks([]common.Hash{p.head})
timeout := time.After(blockSoftTTL)
timeout := time.After(hashTTL)
for {
select {
case <-d.cancelCh:
@ -779,47 +780,27 @@ func (d *Downloader) fetchBlocks61(from uint64) error {
// If the peer was previously banned and failed to deliver it's pack
// in a reasonable time frame, ignore it's message.
if peer := d.peers.Peer(packet.PeerId()); peer != nil {
// Deliver the received chunk of blocks, and demote in case of errors
blocks := packet.(*blockPack).blocks
err := d.queue.DeliverBlocks(peer.id, blocks)
switch err {
case nil:
// If no blocks were delivered, demote the peer (need the delivery above)
if len(blocks) == 0 {
peer.Demote()
peer.SetBlocksIdle()
glog.V(logger.Detail).Infof("%s: no blocks delivered", peer)
break
}
// All was successful, promote the peer and potentially start processing
peer.Promote()
peer.SetBlocksIdle()
glog.V(logger.Detail).Infof("%s: delivered %d blocks", peer, len(blocks))
case errInvalidChain:
// The hash chain is invalid (blocks are not ordered properly), abort
// Deliver the received chunk of blocks and check chain validity
accepted, err := d.queue.DeliverBlocks(peer.id, blocks)
if err == errInvalidChain {
return err
case errNoFetchesPending:
// Peer probably timed out with its delivery but came through
// in the end, demote, but allow to to pull from this peer.
peer.Demote()
peer.SetBlocksIdle()
glog.V(logger.Detail).Infof("%s: out of bound delivery", peer)
case errStaleDelivery:
// Delivered something completely else than requested, usually
// caused by a timeout and delivery during a new sync cycle.
// Don't set it to idle as the original request should still be
// in flight.
peer.Demote()
glog.V(logger.Detail).Infof("%s: stale delivery", peer)
}
// Unless a peer delivered something completely else than requested (usually
// caused by a timed out request which came through in the end), set it to
// idle. If the delivery's stale, the peer should have already been idled.
if err != errStaleDelivery {
peer.SetBlocksIdle(accepted)
}
// Issue a log to the user to see what's going on
switch {
case err == nil && len(blocks) == 0:
glog.V(logger.Detail).Infof("%s: no blocks delivered", peer)
case err == nil:
glog.V(logger.Detail).Infof("%s: delivered %d blocks", peer, len(blocks))
default:
// Peer did something semi-useful, demote but keep it around
peer.Demote()
peer.SetBlocksIdle()
glog.V(logger.Detail).Infof("%s: delivery partially failed: %v", peer, err)
glog.V(logger.Detail).Infof("%s: delivery failed: %v", peer, err)
}
}
// Blocks arrived, try to update the progress
@ -852,10 +833,15 @@ func (d *Downloader) fetchBlocks61(from uint64) error {
return errNoPeers
}
// Check for block request timeouts and demote the responsible peers
for _, pid := range d.queue.ExpireBlocks(blockHardTTL) {
for pid, fails := range d.queue.ExpireBlocks(blockTTL) {
if peer := d.peers.Peer(pid); peer != nil {
peer.Demote()
glog.V(logger.Detail).Infof("%s: block delivery timeout", peer)
if fails > 1 {
glog.V(logger.Detail).Infof("%s: block delivery timeout", peer)
peer.SetBlocksIdle(0)
} else {
glog.V(logger.Debug).Infof("%s: stalling block delivery, dropping", peer)
d.dropPeer(pid)
}
}
}
// If there's nothing more to fetch, wait or terminate
@ -1281,14 +1267,14 @@ func (d *Downloader) fetchBodies(from uint64) error {
glog.V(logger.Debug).Infof("Downloading block bodies from #%d", from)
var (
deliver = func(packet dataPack) error {
deliver = func(packet dataPack) (int, error) {
pack := packet.(*bodyPack)
return d.queue.DeliverBodies(pack.peerId, pack.transactions, pack.uncles)
}
expire = func() []string { return d.queue.ExpireBodies(bodyHardTTL) }
expire = func() map[string]int { return d.queue.ExpireBodies(bodyTTL) }
fetch = func(p *peer, req *fetchRequest) error { return p.FetchBodies(req) }
capacity = func(p *peer) int { return p.BlockCapacity() }
setIdle = func(p *peer) { p.SetBodiesIdle() }
setIdle = func(p *peer, accepted int) { p.SetBodiesIdle(accepted) }
)
err := d.fetchParts(errCancelBodyFetch, d.bodyCh, deliver, d.bodyWakeCh, expire,
d.queue.PendingBlocks, d.queue.InFlightBlocks, d.queue.ShouldThrottleBlocks, d.queue.ReserveBodies,
@ -1305,14 +1291,14 @@ func (d *Downloader) fetchReceipts(from uint64) error {
glog.V(logger.Debug).Infof("Downloading receipts from #%d", from)
var (
deliver = func(packet dataPack) error {
deliver = func(packet dataPack) (int, error) {
pack := packet.(*receiptPack)
return d.queue.DeliverReceipts(pack.peerId, pack.receipts)
}
expire = func() []string { return d.queue.ExpireReceipts(receiptHardTTL) }
expire = func() map[string]int { return d.queue.ExpireReceipts(receiptTTL) }
fetch = func(p *peer, req *fetchRequest) error { return p.FetchReceipts(req) }
capacity = func(p *peer) int { return p.ReceiptCapacity() }
setIdle = func(p *peer) { p.SetReceiptsIdle() }
setIdle = func(p *peer, accepted int) { p.SetReceiptsIdle(accepted) }
)
err := d.fetchParts(errCancelReceiptFetch, d.receiptCh, deliver, d.receiptWakeCh, expire,
d.queue.PendingReceipts, d.queue.InFlightReceipts, d.queue.ShouldThrottleReceipts, d.queue.ReserveReceipts,
@ -1329,7 +1315,7 @@ func (d *Downloader) fetchNodeData() error {
glog.V(logger.Debug).Infof("Downloading node state data")
var (
deliver = func(packet dataPack) error {
deliver = func(packet dataPack) (int, error) {
start := time.Now()
return d.queue.DeliverNodeData(packet.PeerId(), packet.(*statePack).states, func(err error, delivered int) {
if err != nil {
@ -1352,14 +1338,14 @@ func (d *Downloader) fetchNodeData() error {
glog.V(logger.Info).Infof("imported %d state entries in %v: processed %d in total", delivered, time.Since(start), d.syncStatsStateDone)
})
}
expire = func() []string { return d.queue.ExpireNodeData(stateHardTTL) }
expire = func() map[string]int { return d.queue.ExpireNodeData(stateTTL) }
throttle = func() bool { return false }
reserve = func(p *peer, count int) (*fetchRequest, bool, error) {
return d.queue.ReserveNodeData(p, count), false, nil
}
fetch = func(p *peer, req *fetchRequest) error { return p.FetchNodeData(req) }
capacity = func(p *peer) int { return p.NodeDataCapacity() }
setIdle = func(p *peer) { p.SetNodeDataIdle() }
setIdle = func(p *peer, accepted int) { p.SetNodeDataIdle(accepted) }
)
err := d.fetchParts(errCancelStateFetch, d.stateCh, deliver, d.stateWakeCh, expire,
d.queue.PendingNodeData, d.queue.InFlightNodeData, throttle, reserve, nil, fetch,
@ -1372,10 +1358,10 @@ func (d *Downloader) fetchNodeData() error {
// fetchParts iteratively downloads scheduled block parts, taking any available
// peers, reserving a chunk of fetch requests for each, waiting for delivery and
// also periodically checking for timeouts.
func (d *Downloader) fetchParts(errCancel error, deliveryCh chan dataPack, deliver func(packet dataPack) error, wakeCh chan bool,
expire func() []string, pending func() int, inFlight func() bool, throttle func() bool, reserve func(*peer, int) (*fetchRequest, bool, error),
func (d *Downloader) fetchParts(errCancel error, deliveryCh chan dataPack, deliver func(dataPack) (int, error), wakeCh chan bool,
expire func() map[string]int, pending func() int, inFlight func() bool, throttle func() bool, reserve func(*peer, int) (*fetchRequest, bool, error),
fetchHook func([]*types.Header), fetch func(*peer, *fetchRequest) error, cancel func(*fetchRequest), capacity func(*peer) int,
idle func() ([]*peer, int), setIdle func(*peer), kind string) error {
idle func() ([]*peer, int), setIdle func(*peer, int), kind string) error {
// Create a ticker to detect expired retrieval tasks
ticker := time.NewTicker(100 * time.Millisecond)
@ -1394,45 +1380,25 @@ func (d *Downloader) fetchParts(errCancel error, deliveryCh chan dataPack, deliv
// If the peer was previously banned and failed to deliver it's pack
// in a reasonable time frame, ignore it's message.
if peer := d.peers.Peer(packet.PeerId()); peer != nil {
// Deliver the received chunk of data, and demote in case of errors
switch err := deliver(packet); err {
case nil:
// If no blocks were delivered, demote the peer (need the delivery above to clean internal queue!)
if packet.Items() == 0 {
peer.Demote()
setIdle(peer)
glog.V(logger.Detail).Infof("%s: no %s delivered", peer, strings.ToLower(kind))
break
}
// All was successful, promote the peer and potentially start processing
peer.Promote()
setIdle(peer)
glog.V(logger.Detail).Infof("%s: delivered %s %s(s)", peer, packet.Stats(), strings.ToLower(kind))
case errInvalidChain:
// The hash chain is invalid (blocks are not ordered properly), abort
// Deliver the received chunk of data and check chain validity
accepted, err := deliver(packet)
if err == errInvalidChain {
return err
case errNoFetchesPending:
// Peer probably timed out with its delivery but came through
// in the end, demote, but allow to to pull from this peer.
peer.Demote()
setIdle(peer)
glog.V(logger.Detail).Infof("%s: out of bound %s delivery", peer, strings.ToLower(kind))
case errStaleDelivery:
// Delivered something completely else than requested, usually
// caused by a timeout and delivery during a new sync cycle.
// Don't set it to idle as the original request should still be
// in flight.
peer.Demote()
glog.V(logger.Detail).Infof("%s: %s stale delivery", peer, strings.ToLower(kind))
}
// Unless a peer delivered something completely else than requested (usually
// caused by a timed out request which came through in the end), set it to
// idle. If the delivery's stale, the peer should have already been idled.
if err != errStaleDelivery {
setIdle(peer, accepted)
}
// Issue a log to the user to see what's going on
switch {
case err == nil && packet.Items() == 0:
glog.V(logger.Detail).Infof("%s: no %s delivered", peer, strings.ToLower(kind))
case err == nil:
glog.V(logger.Detail).Infof("%s: delivered %s %s(s)", peer, packet.Stats(), strings.ToLower(kind))
default:
// Peer did something semi-useful, demote but keep it around
peer.Demote()
setIdle(peer)
glog.V(logger.Detail).Infof("%s: %s delivery partially failed: %v", peer, strings.ToLower(kind), err)
glog.V(logger.Detail).Infof("%s: %s delivery failed: %v", peer, strings.ToLower(kind), err)
}
}
// Blocks assembled, try to update the progress
@ -1465,11 +1431,15 @@ func (d *Downloader) fetchParts(errCancel error, deliveryCh chan dataPack, deliv
return errNoPeers
}
// Check for fetch request timeouts and demote the responsible peers
for _, pid := range expire() {
for pid, fails := range expire() {
if peer := d.peers.Peer(pid); peer != nil {
peer.Demote()
setIdle(peer)
glog.V(logger.Detail).Infof("%s: %s delivery timeout", peer, strings.ToLower(kind))
if fails > 1 {
glog.V(logger.Detail).Infof("%s: %s delivery timeout", peer, strings.ToLower(kind))
setIdle(peer, 0)
} else {
glog.V(logger.Debug).Infof("%s: stalling %s delivery, dropping", peer, strings.ToLower(kind))
d.dropPeer(pid)
}
}
}
// If there's nothing more to fetch, wait or terminate