Add node name prefix (#4356)

Author: pixcc

ydb/core/mind/node_broker.cpp

@@ -107,6 +107,7 @@ bool TNodeBroker::OnRenderAppHtmlPage(NMon::TEvRemoteHttpInfo::TPtr ev,
                 << "  MaxStaticNodeId: " << AppData(ctx)->DynamicNameserviceConfig->MaxStaticNodeId << Endl
                 << "  MaxDynamicNodeId: " << AppData(ctx)->DynamicNameserviceConfig->MaxDynamicNodeId << Endl
                 << "  EpochDuration: " << EpochDuration << Endl
+                << "  NodeNamePrefix: " << NodeNamePrefix << Endl
                 << "  BannedIds:";
             for (auto &pr : BannedIds)
                 str << " [" << pr.first << ", " << pr.second << "]";
@@ -346,7 +347,7 @@ void TNodeBroker::FillNodeName(const std::optional<ui32> &slotIndex,
                                NKikimrNodeBroker::TNodeInfo &info) const
 {
     if (EnableDynamicNodeNameGeneration && slotIndex.has_value()) {
-        const TString name = TStringBuilder() << "slot-" << slotIndex;
+        const TString name = TStringBuilder() << NodeNamePrefix << slotIndex.value();
         info.SetName(name);
     }
 }
@@ -487,6 +488,8 @@ void TNodeBroker::LoadConfigFromProto(const NKikimrNodeBroker::TConfig &config)
         EpochDuration = MIN_LEASE_DURATION;
     }
 
+    NodeNamePrefix = config.GetNodeNamePrefix();
+
     BannedIds.clear();
     for (auto &banned : config.GetBannedNodeIds())
         BannedIds.emplace_back(banned.GetFrom(), banned.GetTo());

ydb/core/mind/node_broker_impl.h

@@ -314,6 +314,7 @@ class TNodeBroker : public TActor<TNodeBroker>
     TDuration EpochDuration;
     TVector<std::pair<ui32, ui32>> BannedIds;
     ui64 ConfigSubscriptionId;
+    TString NodeNamePrefix;
 
     // Events collected during initialization phase.
     TMultiMap<ui64, TEvNodeBroker::TEvListNodes::TPtr> DelayedListNodesRequests;
@@ -328,6 +329,7 @@ class TNodeBroker : public TActor<TNodeBroker>
         , TTabletExecutedFlat(info, tablet, new NMiniKQL::TMiniKQLFactory)
         , EpochDuration(TDuration::Hours(1))
         , ConfigSubscriptionId(0)
+        , NodeNamePrefix("slot-")
         , TxProcessor(new TTxProcessor(*this, "root", NKikimrServices::NODE_BROKER))
     {
     }

ydb/core/protos/node_broker.proto

@@ -102,6 +102,7 @@ message TConfig {
     optional uint64 EpochDuration = 1 [default = 3600000000];
     // Don't allocate and extend lease for IDs from banned intervals.
     repeated TNodeIds BannedNodeIds = 2;
+    optional string NodeNamePrefix = 3 [default = "slot-"];
 }
 
 message TGetConfigRequest {