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Don't use latency as initital estimate for blocksync #3648

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merged 6 commits into from
Sep 8, 2020
Merged

Don't use latency as initital estimate for blocksync #3648

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043e62a
Don't use latency as initital estimate for blocksync
Sep 8, 2020
93176c9
Track time in relation to request size
Sep 8, 2020
74e5776
Forward peers from hello to blocksync
Sep 8, 2020
ba9678b
Use for to iterate over channel
Sep 8, 2020
4fce018
Ignore the linter
Sep 8, 2020
b66058e
Add 0 guard
Sep 8, 2020
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11 changes: 7 additions & 4 deletions chain/blocksync/client.go
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Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,7 @@ import (
inet "github.com/libp2p/go-libp2p-core/network"
"github.com/libp2p/go-libp2p-core/peer"
"go.opencensus.io/trace"
"go.uber.org/fx"
"golang.org/x/xerrors"

cborutil "github.com/filecoin-project/go-cbor-util"
Expand All @@ -36,12 +37,13 @@ type BlockSync struct {
}

func NewClient(
lc fx.Lifecycle,
host host.Host,
pmgr peermgr.MaybePeerMgr,
) *BlockSync {
return &BlockSync{
host: host,
peerTracker: newPeerTracker(pmgr.Mgr),
peerTracker: newPeerTracker(lc, host, pmgr.Mgr),
}
}

Expand Down Expand Up @@ -360,6 +362,7 @@ func (client *BlockSync) sendRequestToPeer(

supported, err := client.host.Peerstore().SupportsProtocols(peer, BlockSyncProtocolID)
if err != nil {
client.RemovePeer(peer)
return nil, xerrors.Errorf("failed to get protocols for peer: %w", err)
}
if len(supported) == 0 || supported[0] != BlockSyncProtocolID {
Expand All @@ -385,7 +388,7 @@ func (client *BlockSync) sendRequestToPeer(
_ = stream.SetWriteDeadline(time.Now().Add(WRITE_REQ_DEADLINE))
if err := cborutil.WriteCborRPC(stream, req); err != nil {
_ = stream.SetWriteDeadline(time.Time{})
client.peerTracker.logFailure(peer, build.Clock.Since(connectionStart))
client.peerTracker.logFailure(peer, build.Clock.Since(connectionStart), req.Length)
// FIXME: Should we also remove peer here?
return nil, err
}
Expand All @@ -398,7 +401,7 @@ func (client *BlockSync) sendRequestToPeer(
bufio.NewReader(incrt.New(stream, READ_RES_MIN_SPEED, READ_RES_DEADLINE)),
&res)
if err != nil {
client.peerTracker.logFailure(peer, build.Clock.Since(connectionStart))
client.peerTracker.logFailure(peer, build.Clock.Since(connectionStart), req.Length)
return nil, xerrors.Errorf("failed to read blocksync response: %w", err)
}

Expand All @@ -412,7 +415,7 @@ func (client *BlockSync) sendRequestToPeer(
)
}

client.peerTracker.logSuccess(peer, build.Clock.Since(connectionStart))
client.peerTracker.logSuccess(peer, build.Clock.Since(connectionStart), uint64(len(res.Chain)))
// FIXME: We should really log a success only after we validate the response.
// It might be a bit hard to do.
return &res, nil
Expand Down
55 changes: 37 additions & 18 deletions chain/blocksync/peer_tracker.go
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Original file line number Diff line number Diff line change
Expand Up @@ -3,11 +3,14 @@ package blocksync
// FIXME: This needs to be reviewed.

import (
"context"
"sort"
"sync"
"time"

host "github.com/libp2p/go-libp2p-core/host"
"github.com/libp2p/go-libp2p-core/peer"
"go.uber.org/fx"

"github.com/filecoin-project/lotus/build"
"github.com/filecoin-project/lotus/lib/peermgr"
Expand All @@ -29,11 +32,30 @@ type bsPeerTracker struct {
pmgr *peermgr.PeerMgr
}

func newPeerTracker(pmgr *peermgr.PeerMgr) *bsPeerTracker {
return &bsPeerTracker{
func newPeerTracker(lc fx.Lifecycle, h host.Host, pmgr *peermgr.PeerMgr) *bsPeerTracker {
bsPt := &bsPeerTracker{
peers: make(map[peer.ID]*peerStats),
pmgr: pmgr,
}

sub, err := h.EventBus().Subscribe(new(peermgr.NewFilPeer))
if err != nil {
panic(err)
}

go func() {
for newPeer := range sub.Out() {
bsPt.addPeer(newPeer.(peermgr.NewFilPeer).Id)
}
}()

lc.Append(fx.Hook{
OnStop: func(ctx context.Context) error {
return sub.Close()
},
})

return bsPt
}

func (bpt *bsPeerTracker) addPeer(p peer.ID) {
Expand Down Expand Up @@ -72,16 +94,7 @@ func (bpt *bsPeerTracker) prefSortedPeers() []peer.ID {
var costI, costJ float64

getPeerInitLat := func(p peer.ID) float64 {
var res float64
if bpt.pmgr != nil {
if lat, ok := bpt.pmgr.GetPeerLatency(p); ok {
res = float64(lat)
}
}
if res == 0 {
res = float64(bpt.avgGlobalTime)
}
return res * newPeerMul
return float64(bpt.avgGlobalTime) * newPeerMul
}

if pi.successes+pi.failures > 0 {
Expand All @@ -107,8 +120,8 @@ func (bpt *bsPeerTracker) prefSortedPeers() []peer.ID {
const (
// xInvAlpha = (N+1)/2

localInvAlpha = 5 // 86% of the value is the last 9
globalInvAlpha = 20 // 86% of the value is the last 39
localInvAlpha = 10 // 86% of the value is the last 19
globalInvAlpha = 25 // 86% of the value is the last 49
)

func (bpt *bsPeerTracker) logGlobalSuccess(dur time.Duration) {
Expand All @@ -133,7 +146,7 @@ func logTime(pi *peerStats, dur time.Duration) {

}

func (bpt *bsPeerTracker) logSuccess(p peer.ID, dur time.Duration) {
func (bpt *bsPeerTracker) logSuccess(p peer.ID, dur time.Duration, reqSize uint64) {
bpt.lk.Lock()
defer bpt.lk.Unlock()

Expand All @@ -145,10 +158,13 @@ func (bpt *bsPeerTracker) logSuccess(p peer.ID, dur time.Duration) {
}

pi.successes++
logTime(pi, dur)
if reqSize == 0 {
reqSize = 1
}
logTime(pi, dur/time.Duration(reqSize))
}

func (bpt *bsPeerTracker) logFailure(p peer.ID, dur time.Duration) {
func (bpt *bsPeerTracker) logFailure(p peer.ID, dur time.Duration, reqSize uint64) {
bpt.lk.Lock()
defer bpt.lk.Unlock()

Expand All @@ -160,7 +176,10 @@ func (bpt *bsPeerTracker) logFailure(p peer.ID, dur time.Duration) {
}

pi.failures++
logTime(pi, dur)
if reqSize == 0 {
reqSize = 1
}
logTime(pi, dur/time.Duration(reqSize))
}

func (bpt *bsPeerTracker) removePeer(p peer.ID) {
Expand Down
25 changes: 21 additions & 4 deletions lib/peermgr/peermgr.go
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Original file line number Diff line number Diff line change
Expand Up @@ -10,7 +10,10 @@ import (
"github.com/filecoin-project/lotus/node/modules/dtypes"
"go.opencensus.io/stats"
"go.uber.org/fx"
"go.uber.org/multierr"
"golang.org/x/xerrors"

"github.com/libp2p/go-libp2p-core/event"
host "github.com/libp2p/go-libp2p-core/host"
net "github.com/libp2p/go-libp2p-core/network"
peer "github.com/libp2p/go-libp2p-core/peer"
Expand Down Expand Up @@ -50,12 +53,17 @@ type PeerMgr struct {
h host.Host
dht *dht.IpfsDHT

notifee *net.NotifyBundle
notifee *net.NotifyBundle
filPeerEmitter event.Emitter

done chan struct{}
}

func NewPeerMgr(lc fx.Lifecycle, h host.Host, dht *dht.IpfsDHT, bootstrap dtypes.BootstrapPeers) *PeerMgr {
type NewFilPeer struct {
Id peer.ID
}

func NewPeerMgr(lc fx.Lifecycle, h host.Host, dht *dht.IpfsDHT, bootstrap dtypes.BootstrapPeers) (*PeerMgr, error) {
pm := &PeerMgr{
h: h,
dht: dht,
Expand All @@ -69,10 +77,18 @@ func NewPeerMgr(lc fx.Lifecycle, h host.Host, dht *dht.IpfsDHT, bootstrap dtypes

done: make(chan struct{}),
}
emitter, err := h.EventBus().Emitter(new(NewFilPeer))
if err != nil {
return nil, xerrors.Errorf("creating NewFilPeer emitter: %w", err)
}
pm.filPeerEmitter = emitter

lc.Append(fx.Hook{
OnStop: func(ctx context.Context) error {
return pm.Stop(ctx)
return multierr.Combine(
pm.filPeerEmitter.Close(),
pm.Stop(ctx),
)
},
})

Expand All @@ -84,10 +100,11 @@ func NewPeerMgr(lc fx.Lifecycle, h host.Host, dht *dht.IpfsDHT, bootstrap dtypes

h.Network().Notify(pm.notifee)

return pm
return pm, nil
}

func (pmgr *PeerMgr) AddFilecoinPeer(p peer.ID) {
_ = pmgr.filPeerEmitter.Emit(NewFilPeer{Id: p}) //nolint:errcheck
pmgr.peersLk.Lock()
defer pmgr.peersLk.Unlock()
pmgr.peers[p] = time.Duration(0)
Expand Down