control inflight pings in hive (ydb-platform#6916)

ydb/core/mind/hive/hive_impl.cpp

@@ -495,6 +495,7 @@ void THive::Handle(TEvPrivate::TEvBootTablets::TPtr&) {
     for (auto* node : unimportantNodes) {
         node->Ping();
     }
+    ProcessNodePingQueue();
     TVector<TTabletId> tabletsToReleaseFromParent;
     TSideEffects sideEffects;
     sideEffects.Reset(SelfId());
@@ -685,11 +686,13 @@ void THive::Cleanup() {
 
 void THive::Handle(TEvLocal::TEvStatus::TPtr& ev) {
     BLOG_D("Handle TEvLocal::TEvStatus for Node " << ev->Sender.NodeId() << ": " << ev->Get()->Record.ShortDebugString());
+    RemoveFromPingInProgress(ev->Sender.NodeId());
     Execute(CreateStatus(ev->Sender, ev->Get()->Record));
 }
 
 void THive::Handle(TEvLocal::TEvSyncTablets::TPtr& ev) {
     BLOG_D("THive::Handle::TEvSyncTablets");
+    RemoveFromPingInProgress(ev->Sender.NodeId());
     Execute(CreateSyncTablets(ev->Sender, ev->Get()->Record));
 }
 
@@ -742,7 +745,10 @@ void THive::Handle(TEvInterconnect::TEvNodeConnected::TPtr &ev) {
 void THive::Handle(TEvInterconnect::TEvNodeDisconnected::TPtr &ev) {
     TNodeId nodeId = ev->Get()->NodeId;
     BLOG_W("Handle TEvInterconnect::TEvNodeDisconnected, NodeId " << nodeId);
-    ConnectedNodes.erase(nodeId);
+    RemoveFromPingInProgress(nodeId);
+    if (ConnectedNodes.erase(nodeId)) {
+       UpdateCounterNodesConnected(-1);
+    }
     Execute(CreateDisconnectNode(THolder<TEvInterconnect::TEvNodeDisconnected>(ev->Release().Release())));
 }
 
@@ -912,6 +918,7 @@ void THive::Handle(TEvents::TEvUndelivered::TPtr &ev) {
     case TEvLocal::EvPing: {
         TNodeId nodeId = ev->Cookie;
         TNodeInfo* node = FindNode(nodeId);
+        NodePingsInProgress.erase(nodeId);
         if (node != nullptr && ev->Sender == node->Local) {
             if (node->IsDisconnecting()) {
                 // ping continiousily until we fully disconnected from the node
@@ -920,6 +927,7 @@ void THive::Handle(TEvents::TEvUndelivered::TPtr &ev) {
                 KillNode(node->Id, node->Local);
             }
         }
+        ProcessNodePingQueue();
         break;
     }
     };
@@ -1684,6 +1692,13 @@ void THive::UpdateCounterNodesConnected(i64 nodesConnectedDiff) {
     }
 }
 
+void THive::UpdateCounterPingQueueSize() {
+    if (TabletCounters != nullptr) {
+        auto& counter = TabletCounters->Simple()[NHive::COUNTER_PINGQUEUE_SIZE];
+        counter.Set(NodePingQueue.size());
+    }
+}
+
 void THive::RecordTabletMove(const TTabletMoveInfo& moveInfo) {
     TabletMoveHistory.PushBack(moveInfo);
     TabletCounters->Cumulative()[NHive::COUNTER_TABLETS_MOVED].Increment(1);
@@ -2648,6 +2663,25 @@ void THive::ExecuteStartTablet(TFullTabletId tabletId, const TActorId& local, ui
     Execute(CreateStartTablet(tabletId, local, cookie, external));
 }
 
+void THive::QueuePing(const TActorId& local) {
+    NodePingQueue.push(local);
+}
+
+void THive::ProcessNodePingQueue() {
+    while (!NodePingQueue.empty() && NodePingsInProgress.size() < GetMaxPingsInFlight()) {
+        TActorId local = NodePingQueue.front();
+        TNodeId node = local.NodeId();
+        NodePingQueue.pop();
+        NodePingsInProgress.insert(node);
+        SendPing(local, node);
+    }
+}
+
+void THive::RemoveFromPingInProgress(TNodeId node) {
+    NodePingsInProgress.erase(node);
+    ProcessNodePingQueue();
+}
+
 void THive::SendPing(const TActorId& local, TNodeId id) {
     Send(local,
          new TEvLocal::TEvPing(HiveId,

ydb/core/mind/hive/hive_impl.h

@@ -409,6 +409,8 @@ class THive : public TActor<THive>, public TTabletExecutedFlat, public THiveShar
     TOwnershipKeeper Keeper;
     TEventPriorityQueue<THive> EventQueue{*this};
     std::vector<TActorId> ActorsWaitingToMoveTablets;
+    std::queue<TActorId> NodePingQueue;
+    std::unordered_set<TNodeId> NodePingsInProgress;
 
     struct TPendingCreateTablet {
         NKikimrHive::TEvCreateTablet CreateTablet;
@@ -642,6 +644,7 @@ TTabletInfo* FindTabletEvenInDeleting(TTabletId tabletId, TFollowerId followerId
     void UpdateCounterBootQueueSize(ui64 bootQueueSize);
     void UpdateCounterEventQueueSize(i64 eventQueueSizeDiff);
     void UpdateCounterNodesConnected(i64 nodesConnectedDiff);
+    void UpdateCounterPingQueueSize();
     void RecordTabletMove(const TTabletMoveInfo& info);
     bool DomainHasNodes(const TSubDomainKey &domainKey) const;
     void ProcessBootQueue();
@@ -670,7 +673,10 @@ TTabletInfo* FindTabletEvenInDeleting(TTabletId tabletId, TFollowerId followerId
     void UpdateRegisteredDataCenters();
     void AddRegisteredDataCentersNode(TDataCenterId dataCenterId, TNodeId nodeId);
     void RemoveRegisteredDataCentersNode(TDataCenterId dataCenterId, TNodeId nodeId);
+    void QueuePing(const TActorId& local);
     void SendPing(const TActorId& local, TNodeId id);
+    void RemoveFromPingInProgress(TNodeId node);
+    void ProcessNodePingQueue();
     void SendReconnect(const TActorId& local);
     static THolder<TGroupFilter> BuildGroupParametersForChannel(const TLeaderTabletInfo& tablet, ui32 channelId);
     void KickTablet(const TTabletInfo& tablet);
@@ -923,6 +929,10 @@ TTabletInfo* FindTabletEvenInDeleting(TTabletId tabletId, TFollowerId followerId
         return CurrentConfig.GetStorageBalancerInflight();
     }
 
+    ui64 GetMaxPingsInFlight() const {
+        return CurrentConfig.GetMaxPingsInFlight();
+    }
+
     static void ActualizeRestartStatistics(google::protobuf::RepeatedField<google::protobuf::uint64>& restartTimestamps, ui64 barrier);
     static ui64 GetRestartsPerPeriod(const google::protobuf::RepeatedField<google::protobuf::uint64>& restartTimestamps, ui64 barrier);
     static bool IsSystemTablet(TTabletTypes::EType type);

ydb/core/mind/hive/node_info.cpp

@@ -337,7 +337,7 @@ void TNodeInfo::DeregisterInDomains() {
 void TNodeInfo::Ping() {
     Y_ABORT_UNLESS((bool)Local);
     BLOG_D("Node(" << Id << ") Ping(" << Local << ")");
-    Hive.SendPing(Local, Id);
+    Hive.QueuePing(Local);
 }
 
 void TNodeInfo::SendReconnect(const TActorId& local) {

ydb/core/mind/hive/tx__register_node.cpp

@@ -77,7 +77,9 @@ class TTxRegisterNode : public TTransactionBase<THive> {
         BLOG_D("THive::TTxRegisterNode(" << Local.NodeId() << ")::Complete");
         TNodeInfo* node = Self->FindNode(Local.NodeId());
         if (node != nullptr && node->Local) { // we send ping on every RegisterNode because we want to re-sync tablets upon every reconnection
+            Self->NodePingsInProgress.erase(node->Id);
             node->Ping();
+            Self->ProcessNodePingQueue();
         }
     }
 };

ydb/core/protos/config.proto

@@ -1479,6 +1479,7 @@ message THiveConfig {
     optional double MinStorageScatterToBalance = 71 [default = 999]; // storage balancer trigger is disabled by default
     optional double MinGroupUsageToBalance = 72 [default = 0.1];
     optional uint64 StorageBalancerInflight = 73 [default = 1];
+    optional uint64 MaxPingsInFlight = 78 [default = 1000];
 }
 
 message TColumnShardConfig {

ydb/core/protos/counters_hive.proto

@@ -29,6 +29,7 @@ enum ESimpleCounters {
     COUNTER_IMBALANCED_OBJECTS = 19 [(CounterOpts) = {Name: "ImbalancedObjects"}];
     COUNTER_WORST_OBJECT_VARIANCE = 20 [(CounterOpts) = {Name: "WorstObjectVariance"}];
     COUNTER_STORAGE_SCATTER = 21 [(CounterOpts) = {Name: "StorageScatter"}];
+    COUNTER_PINGQUEUE_SIZE = 23 [(CounterOpts) = {Name: "PingQueueSize"}];
 }
 
 enum ECumulativeCounters {