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Syncing V2 (#1602) 

* Syncing workers now not bound to peers.
Sync status is now printed in statusbar.

* Add `SyncQueue.outSlot` to statusbar too.

* Add `inRangeEvent` and `rangeAge` parameter.

* Fix rangeAge is not depends on SyncQueue latest slot.
Fix syncManager to start from latest local head slot.

* Add notInRange event.

* Remove suspects field.
This commit is contained in:
Eugene Kabanov 2020-09-11 15:46:01 +03:00 committed by GitHub
parent 775683cf2e
commit c7c9b9d5f1
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GPG Key ID: 4AEE18F83AFDEB23
3 changed files with 184 additions and 191 deletions
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8
beacon_chain/beacon_node.nim
View File

@ -995,6 +995,14 @@ when hasPrompt:
balance += b
formatGwei(balance)
of "sync_status":
if isNil(node.syncManager):
"pending"
else:
if node.syncManager.inProgress:
node.syncManager.syncStatus
else:
"synced"
else:
# We ignore typos for now and just render the expression
# as it was written. TODO: come up with a good way to show

3
beacon_chain/conf.nim
View File

@ -185,7 +185,8 @@ type
defaultValue: "peers: $connected_peers;" &
"finalized: $finalized_root:$finalized_epoch;" &
"head: $head_root:$head_epoch:$head_epoch_slot;" &
"time: $epoch:$epoch_slot ($slot)|"
"time: $epoch:$epoch_slot ($slot);" &
"sync: $sync_status|"
desc: "Textual template for the contents of the status bar"
name: "status-bar-contents" }: string

330
beacon_chain/sync_manager.nim
View File

@ -29,6 +29,9 @@ const
PeerScoreMissingBlocks* = -200
## Peer response contains too many empty blocks.
SyncWorkersCount* = 20
## Number of sync workers to spawn
type
SyncFailureKind* = enum
StatusInvalid,
@ -69,14 +72,19 @@ type
debtsQueue: HeapQueue[SyncRequest[T]]
debtsCount: uint64
readyQueue: HeapQueue[SyncResult[T]]
suspects: seq[SyncResult[T]]
outQueue: AsyncQueue[BlockEntry]
SyncWorkerStatus* {.pure.} = enum
Sleeping, WaitingPeer, UpdatingStatus, Requesting, Downloading, Processing
SyncWorker*[A, B] = object
future: Future[void]
status: SyncWorkerStatus
SyncManager*[A, B] = ref object
pool: PeerPool[A, B]
responseTimeout: chronos.Duration
sleepTime: chronos.Duration
maxWorkersCount: int
maxStatusAge: uint64
maxHeadAge: uint64
maxRecurringFailures: int
@ -84,12 +92,19 @@ type
getLocalHeadSlot: GetSlotCallback
getLocalWallSlot: GetSlotCallback
getFinalizedSlot: GetSlotCallback
workers: array[SyncWorkersCount, SyncWorker[A, B]]
notInSyncEvent: AsyncEvent
rangeAge: uint64
inRangeEvent*: AsyncEvent
notInRangeEvent*: AsyncEvent
chunkSize: uint64
queue: SyncQueue[A]
failures: seq[SyncFailure[A]]
syncFut: Future[void]
outQueue: AsyncQueue[BlockEntry]
inProgress*: bool
syncSpeed*: float
syncStatus*: string
SyncMoment* = object
stamp*: chronos.Moment
@ -585,22 +600,21 @@ proc newSyncManager*[A, B](pool: PeerPool[A, B],
getLocalWallSlotCb: GetSlotCallback,
getFinalizedSlotCb: GetSlotCallback,
outputQueue: AsyncQueue[BlockEntry],
maxWorkers = 10,
maxStatusAge = uint64(SLOTS_PER_EPOCH * 4),
maxHeadAge = uint64(SLOTS_PER_EPOCH * 1),
sleepTime = (int(SLOTS_PER_EPOCH) *
int(SECONDS_PER_SLOT)).seconds,
chunkSize = uint64(SLOTS_PER_EPOCH),
toleranceValue = uint64(1),
maxRecurringFailures = 3
maxRecurringFailures = 3,
rangeAge = uint64(SLOTS_PER_EPOCH * 4)
): SyncManager[A, B] =
let queue = SyncQueue.init(A, getFinalizedSlotCb(), getLocalWallSlotCb(),
let queue = SyncQueue.init(A, getLocalHeadSlotCb(), getLocalWallSlotCb(),
chunkSize, getFinalizedSlotCb, outputQueue, 1)
result = SyncManager[A, B](
pool: pool,
maxWorkersCount: maxWorkers,
maxStatusAge: maxStatusAge,
getLocalHeadSlot: getLocalHeadSlotCb,
getLocalWallSlot: getLocalWallSlotCb,
@ -610,7 +624,11 @@ proc newSyncManager*[A, B](pool: PeerPool[A, B],
sleepTime: sleepTime,
chunkSize: chunkSize,
queue: queue,
outQueue: outputQueue
outQueue: outputQueue,
notInSyncEvent: newAsyncEvent(),
inRangeEvent: newAsyncEvent(),
notInRangeEvent: newAsyncEvent(),
rangeAge: rangeAge
)
proc getBlocks*[A, B](man: SyncManager[A, B], peer: A,
@ -642,6 +660,9 @@ template headAge(): uint64 =
template peerAge(): uint64 =
if peerSlot > wallSlot: 0'u64 else: wallSlot - peerSlot
template queueAge(): uint64 =
wallSlot - man.queue.outSlot
template checkPeerScore(peer, body: untyped): untyped =
mixin getScore
let currentScore = peer.getScore()
@ -656,33 +677,25 @@ template checkPeerScore(peer, body: untyped): untyped =
func syncQueueLen*[A, B](man: SyncManager[A, B]): uint64 =
man.queue.len
proc syncWorker*[A, B](man: SyncManager[A, B],
peer: A): Future[A] {.async.} =
# Sync worker is the lowest level loop which performs syncing with single
# peer.
#
# Logic here is pretty simple:
# 1. Obtain request from SyncQueue.
# 2. Send this request to a peer and obtain response.
# 3. Push response to the SyncQueue, (doesn't matter if it success or failure)
# 4. Update main SyncQueue last slot with wall time slot number.
# 5. From time to time we also requesting peer's status information.
# 6. If our current head slot is near equal to peer's head slot we are
# exiting this loop and finishing that sync-worker task.
# 7. Repeat
proc syncWorker[A, B](man: SyncManager[A, B], index: int) {.async.} =
mixin getKey, getScore, getHeadSlot
debug "Starting syncing with peer", peer = peer,
peer_score = peer.getScore(),
peer_speed = peer.netKbps(),
topics = "syncman"
try:
debug "Starting syncing worker", index = index, topics = "syncman"
while true:
var wallSlot = man.getLocalWallSlot()
var headSlot = man.getLocalHeadSlot()
man.workers[index].status = SyncWorkerStatus.Sleeping
# This event is going to be set until we are not in sync with network
await man.notInSyncEvent.wait()
man.workers[index].status = SyncWorkerStatus.WaitingPeer
let peer = await man.pool.acquire()
try:
let wallSlot = man.getLocalWallSlot()
let headSlot = man.getLocalHeadSlot()
var peerSlot = peer.getHeadSlot()
# We updating SyncQueue's last slot all the time
man.queue.updateLastSlot(wallSlot)
debug "Peer's syncing status", wall_clock_slot = wallSlot,
@ -690,25 +703,27 @@ proc syncWorker*[A, B](man: SyncManager[A, B],
peer_score = peer.getScore(), peer = peer,
peer_speed = peer.netKbps(), topics = "syncman"
# Check if peer's head slot is bigger than our wall clock slot.
if peerSlot > wallSlot + man.toleranceValue:
# Our wall timer is broken, or peer's status information is invalid.
debug "Local timer is broken or peer's status information is invalid",
warn "Local timer is broken or peer's status information is invalid",
wall_clock_slot = wallSlot, remote_head_slot = peerSlot,
local_head_slot = headSlot, peer = peer,
tolerance_value = man.toleranceValue, peer_speed = peer.netKbps(),
peer_score = peer.getScore(), topics = "syncman"
let failure = SyncFailure.init(SyncFailureKind.StatusInvalid, peer)
man.failures.add(failure)
break
continue
# Check if we need to update peer's status information
if peerAge >= man.maxStatusAge:
# Peer's status information is very old, we going to update it.
# Peer's status information is very old, its time to update it
man.workers[index].status = SyncWorkerStatus.UpdatingStatus
debug "Updating peer's status information", wall_clock_slot = wallSlot,
remote_head_slot = peerSlot, local_head_slot = headSlot,
peer = peer, peer_score = peer.getScore(),
peer_speed = peer.netKbps(), topics = "syncman"
checkPeerScore peer:
let res = await peer.updateStatus()
if not(res):
@ -718,20 +733,17 @@ proc syncWorker*[A, B](man: SyncManager[A, B],
peer_speed = peer.netKbps(), topics = "syncman"
let failure = SyncFailure.init(SyncFailureKind.StatusDownload, peer)
man.failures.add(failure)
break
continue
let newPeerSlot = peer.getHeadSlot()
if peerSlot >= newPeerSlot:
peer.updateScore(PeerScoreStaleStatus)
debug "Peer's status information is stale, exiting",
debug "Peer's status information is stale",
wall_clock_slot = wallSlot, remote_old_head_slot = peerSlot,
local_head_slot = headSlot, remote_new_head_slot = newPeerSlot,
peer = peer, peer_score = peer.getScore(),
peer_speed = peer.netKbps(), topics = "syncman"
let failure = SyncFailure.init(SyncFailureKind.StatusStale, peer)
man.failures.add(failure)
break
else:
debug "Peer's status information updated", wall_clock_slot = wallSlot,
remote_old_head_slot = peerSlot, local_head_slot = headSlot,
remote_new_head_slot = newPeerSlot, peer = peer,
@ -745,10 +757,19 @@ proc syncWorker*[A, B](man: SyncManager[A, B],
remote_head_slot = peerSlot, local_head_slot = headSlot,
peer = peer, peer_score = peer.getScore(),
peer_speed = peer.netKbps(), topics = "syncman"
break
continue
man.workers[index].status = SyncWorkerStatus.Requesting
let req = man.queue.pop(peerSlot, peer)
if req.isEmpty():
# SyncQueue could return empty request in 2 cases:
# 1. There no more slots in SyncQueue to download (we are synced, but
# our ``notInSyncEvent`` is not yet cleared).
# 2. Current peer's known head slot is too low to satisfy request.
#
# To avoid endless loop we going to wait for RESP_TIMEOUT time here.
# This time is enough for all pending requests to finish and it is also
# enough for main sync loop to clear ``notInSyncEvent``.
debug "Empty request received from queue, exiting", peer = peer,
local_head_slot = headSlot, remote_head_slot = peerSlot,
queue_input_slot = man.queue.inpSlot,
@ -756,24 +777,16 @@ proc syncWorker*[A, B](man: SyncManager[A, B],
queue_last_slot = man.queue.lastSlot,
peer_speed = peer.netKbps(), peer_score = peer.getScore(),
topics = "syncman"
# Sometimes when syncing is almost done but last requests are still
# pending, this can fall into endless cycle, when low number of peers
# are available in PeerPool. We going to wait for RESP_TIMEOUT time,
# so all pending requests should be finished at this moment.
checkPeerScore peer:
await sleepAsync(RESP_TIMEOUT)
continue
let failure = SyncFailure.init(SyncFailureKind.EmptyProblem, peer)
man.failures.add(failure)
break
man.workers[index].status = SyncWorkerStatus.Downloading
debug "Creating new request for peer", wall_clock_slot = wallSlot,
remote_head_slot = peerSlot, local_head_slot = headSlot,
request_slot = req.slot, request_count = req.count,
request_step = req.step, peer = peer, peer_speed = peer.netKbps(),
peer_score = peer.getScore(), topics = "syncman"
checkPeerScore peer:
let blocks = await man.getBlocks(peer, req)
if blocks.isOk:
@ -795,11 +808,12 @@ proc syncWorker*[A, B](man: SyncManager[A, B],
topics = "syncman"
let failure = SyncFailure.init(SyncFailureKind.BadResponse, peer)
man.failures.add(failure)
break
continue
# Scoring will happen in `syncUpdate`.
checkPeerScore peer,
man.workers[index].status = SyncWorkerStatus.Processing
await man.queue.push(req, data)
# Cleaning up failures.
man.failures.setLen(0)
else:
@ -812,170 +826,140 @@ proc syncWorker*[A, B](man: SyncManager[A, B],
topics = "syncman"
let failure = SyncFailure.init(SyncFailureKind.BlockDownload, peer)
man.failures.add(failure)
break
result = peer
except CatchableError as exc:
debug "Unexpected exception happened", topics = "syncman",
excName = $exc.name, excMsg = exc.msg
finally:
man.pool.release(peer)
proc getWorkersStats[A, B](man: SyncManager[A, B]): tuple[map: string,
sleeping: int,
waiting: int,
pending: int] =
var map = newString(len(man.workers))
var sleeping, waiting, pending: int
for i in 0 ..< len(man.workers):
var ch: char
case man.workers[i].status
of SyncWorkerStatus.Sleeping:
ch = 's'
inc(sleeping)
of SyncWorkerStatus.WaitingPeer:
ch = 'w'
inc(waiting)
of SyncWorkerStatus.UpdatingStatus:
ch = 'U'
inc(pending)
of SyncWorkerStatus.Requesting:
ch = 'R'
inc(pending)
of SyncWorkerStatus.Downloading:
ch = 'D'
inc(pending)
of SyncWorkerStatus.Processing:
ch = 'P'
inc(pending)
map[i] = ch
(map, sleeping, waiting, pending)
proc syncLoop[A, B](man: SyncManager[A, B]) {.async.} =
# This procedure manages main loop of SyncManager and in this loop it
# performs
# 1. It checks for current sync status, "are we synced?".
# 2. If we are in active syncing, it tries to acquire new peers from PeerPool
# and spawns new sync-workers. Number of spawned sync-workers can be
# controlled by `maxWorkersCount` value.
# 3. It stops spawning sync-workers when we are "in sync".
# 4. It calculates syncing performance.
mixin getKey, getScore
var pending = newSeq[Future[A]]()
var acquireFut: Future[A]
var syncSpeed: float = 0.0
template workersCount(): int =
if isNil(acquireFut): len(pending) else: (len(pending) - 1)
# Starting all sync workers
for i in 0 ..< len(man.workers):
man.workers[i].future = syncWorker[A, B](man, i)
proc watchTask() {.async.} =
debug "Synchronization loop started", topics = "syncman"
proc watchAndSpeedTask() {.async.} =
while true:
let wallSlot = man.getLocalWallSlot()
let headSlot = man.getLocalHeadSlot()
let lsm1 = SyncMoment.now(man.getLocalHeadSlot())
await sleepAsync(chronos.seconds(int(SECONDS_PER_SLOT)))
let lsm2 = SyncMoment.now(man.getLocalHeadSlot())
if workersCount() == 0:
syncSpeed = 0.0
let (map, sleeping, waiting, pending) = man.getWorkersStats()
if pending == 0:
man.syncSpeed = 0.0
else:
if (lsm2.slot - lsm1.slot == 0'u64) and (workersCount() > 1):
if (lsm2.slot - lsm1.slot == 0'u64) and (pending > 1):
debug "Syncing process is not progressing, reset the queue",
workers_count = workersCount(),
pending_workers_count = pending,
to_slot = man.queue.outSlot,
local_head_slot = lsm1.slot, topics = "syncman"
await man.queue.resetWait(none[Slot]())
else:
syncSpeed = speed(lsm1, lsm2)
man.syncSpeed = speed(lsm1, lsm2)
debug "Synchronization loop started", topics = "syncman"
debug "Synchronization loop tick", wall_head_slot = wallSlot,
local_head_slot = headSlot, queue_start_slot = man.queue.startSlot,
queue_last_slot = man.queue.lastSlot,
sync_speed = man.syncSpeed, pending_workers_count = pending,
topics = "syncman"
traceAsyncErrors watchTask()
traceAsyncErrors watchAndSpeedTask()
while true:
let wallSlot = man.getLocalWallSlot()
let headSlot = man.getLocalHeadSlot()
let progress =
if headSlot <= man.queue.lastSlot:
man.queue.progress()
else:
100'u64
let (map, sleeping, waiting, pending) = man.getWorkersStats()
debug "Synchronization loop tick", wall_head_slot = wallSlot,
local_head_slot = headSlot, queue_status = progress,
queue_start_slot = man.queue.startSlot,
queue_last_slot = man.queue.lastSlot,
waiting_for_new_peer = $not(isNil(acquireFut)),
sync_speed = syncSpeed, workers_count = workersCount(),
debug "Current syncing state", workers_map = map,
sleeping_workers_count = sleeping,
waiting_workers_count = waiting,
pending_workers_count = pending,
wall_head_slot = wallSlot, local_head_slot = headSlot,
topics = "syncman"
var temp = newSeqOfCap[Future[A]](len(pending))
for fut in pending:
if fut.finished():
if fut == acquireFut:
# We acquired new peer from PeerPool.
if acquireFut.failed():
debug "Synchronization loop failed to get new peer",
wall_head_slot = wallSlot, local_head_slot = headSlot,
workers_count = workersCount(),
errMsg = acquireFut.readError().msg, topics = "syncman"
else:
let peer = acquireFut.read()
if headAge <= man.maxHeadAge:
# If we are already in sync, we going to release just acquired
# peer and do not acquire peers
debug "Synchronization loop reached sync barrier", peer = peer,
wall_head_slot = wallSlot, local_head_slot = headSlot,
peer_score = peer.getScore(), topics = "syncman"
man.pool.release(peer)
else:
if headSlot > man.queue.lastSlot:
debug "Synchronization lost, restoring",
wall_head_slot = wallSlot, local_head_slot = headSlot,
queue_last_slot = man.queue.lastSlot, topics = "syncman"
man.queue = SyncQueue.init(A, man.getFinalizedSlot(), wallSlot,
man.chunkSize, man.getFinalizedSlot,
man.outQueue, 1)
debug "Synchronization loop starting new worker", peer = peer,
wall_head_slot = wallSlot, local_head_slot = headSlot,
peer_score = peer.getScore(), peer_speed = peer.netKbps(),
topics = "syncman"
temp.add(syncWorker(man, peer))
# We will create new `acquireFut` later.
acquireFut = nil
else:
# We got worker finished its work
if fut.failed():
debug "Synchronization loop got worker finished with an error",
wall_head_slot = wallSlot, local_head_slot = headSlot,
errMsg = fut.readError().msg, topics = "syncman"
else:
let peer = fut.read()
debug "Synchronization loop got worker finished",
wall_head_slot = wallSlot, local_head_slot = headSlot,
peer = peer, peer_score = peer.getScore(),
peer_speed = peer.netKbps(),
topics = "syncman"
else:
if fut == acquireFut:
# Task which waits for new peer from PeerPool is not yet finished.
if headAge <= man.maxHeadAge:
debug "Synchronization loop reached sync barrier",
wall_head_slot = wallSlot, local_head_slot = headSlot,
topics = "syncman"
acquireFut = nil
fut.cancel()
else:
temp.add(fut)
else:
temp.add(fut)
pending = temp
# Update status string
man.syncStatus = map & ":" & $pending & ":" &
man.syncSpeed.formatBiggestFloat(ffDecimal, 4) &
" (" & $man.queue.outSlot & ")"
if headAge <= man.maxHeadAge:
man.notInSyncEvent.clear()
# We are marking SyncManager as not working only when we are in sync and
# all sync workers are in `Sleeping` state.
if pending > 0:
debug "Synchronization loop waits for workers completion",
wall_head_slot = wallSlot, local_head_slot = headSlot,
difference = (wallSlot - headSlot), max_head_age = man.maxHeadAge,
sleeping_workers_count = sleeping,
waiting_workers_count = waiting, pending_workers_count = pending,
topics = "syncman"
man.inProgress = true
else:
debug "Synchronization loop sleeping", wall_head_slot = wallSlot,
local_head_slot = headSlot, workers_count = workersCount(),
difference = (wallSlot - headSlot),
local_head_slot = headSlot, difference = (wallSlot - headSlot),
max_head_age = man.maxHeadAge, topics = "syncman"
if len(pending) == 0:
man.inProgress = false
await sleepAsync(man.sleepTime)
else:
debug "Synchronization loop waiting for workers completion",
workers_count = workersCount(), topics = "syncman"
discard await withTimeout(one(pending), man.sleepTime)
else:
man.notInSyncEvent.fire()
man.inProgress = true
if isNil(acquireFut) and len(pending) < man.maxWorkersCount:
acquireFut = man.pool.acquire()
pending.add(acquireFut)
debug "Synchronization loop waiting for new peer",
wall_head_slot = wallSlot, local_head_slot = headSlot,
workers_count = workersCount(), topics = "syncman",
sleep_time = $man.sleepTime
if queueAge <= man.rangeAge:
# We are in requested range ``man.rangeAge``.
man.inRangeEvent.fire()
man.notInRangeEvent.clear()
else:
debug "Synchronization loop waiting for workers",
wall_head_slot = wallSlot, local_head_slot = headSlot,
workers_count = workersCount(), topics = "syncman",
sleep_time = $man.sleep_time
# We are not in requested range anymore ``man.rangeAge``.
man.inRangeEvent.clear()
man.notInRangeEvent.fire()
discard await withTimeout(one(pending), man.sleepTime)
if len(man.failures) > man.maxRecurringFailures and (workersCount() > 1):
if len(man.failures) > man.maxRecurringFailures and pending > 1:
debug "Number of recurring failures exceeds limit, reseting queue",
workers_count = workers_count(), rec_failures = len(man.failures)
pending_workers_count = pending, sleeping_workers_count = sleeping,
waiting_workers_count = waiting, rec_failures = len(man.failures),
topics = "syncman"
# Cleaning up failures.
man.failures.setLen(0)
await man.queue.resetWait(none[Slot]())
await sleepAsync(chronos.seconds(2))
proc start*[A, B](man: SyncManager[A, B]) =
## Starts SyncManager's main loop.
man.syncFut = man.syncLoop()