enhance: [2.6] add a disk quota for the loaded binlog size to prevent load failures of querynode (#44932)

issue: #41435 
pr: #44893

---------

Signed-off-by: Shawn Wang <[email protected]>

Author: sparknack

configs/milvus.yaml

@@ -1209,6 +1209,7 @@ quotaAndLimits:
     diskProtection:
       enabled: true # When the total file size of object storage is greater than `diskQuota`, all dml requests would be rejected;
       diskQuota: -1 # MB, (0, +inf), default no limit
+      loadedDiskQuota: -1 # MB, (0, +inf), default no limit
       diskQuotaPerDB: -1 # MB, (0, +inf), default no limit
       diskQuotaPerCollection: -1 # MB, (0, +inf), default no limit
       diskQuotaPerPartition: -1 # MB, (0, +inf), default no limit

internal/querynodev2/metrics_info.go

@@ -153,6 +153,7 @@ func getQuotaMetrics(node *QueryNode) (*metricsinfo.QueryNodeQuotaMetrics, error
 			NumFlowGraph:        node.pipelineManager.Num(),
 		},
 		GrowingSegmentsSize: totalGrowingSize,
+		LoadedBinlogSize:    node.manager.Segment.GetLoadedBinlogSize(),
 		Effect: metricsinfo.NodeEffect{
 			NodeID:        node.GetNodeID(),
 			CollectionIDs: lo.Keys(collections),

internal/querynodev2/segments/manager.go

@@ -29,6 +29,7 @@ import (
 	"fmt"
 	"sync"
 
+	"go.uber.org/atomic"
 	"go.uber.org/zap"
 	"golang.org/x/sync/singleflight"
 
@@ -202,6 +203,10 @@ type SegmentManager interface {
 	AddLogicalResource(usage ResourceUsage)
 	SubLogicalResource(usage ResourceUsage)
 	GetLogicalResource() ResourceUsage
+
+	AddLoadedBinlogSize(size int64)
+	SubLoadedBinlogSize(size int64)
+	GetLoadedBinlogSize() int64
 }
 
 var _ SegmentManager = (*segmentManager)(nil)
@@ -377,6 +382,9 @@ type segmentManager struct {
 	// only MemorySize and DiskSize are used, other fields are ignored.
 	logicalResource     ResourceUsage
 	logicalResourceLock sync.Mutex
+
+	// loadedBinlogSize stats the total binlog size of all loaded segments of this querynode.
+	loadedBinlogSize atomic.Int64
 }
 
 func NewSegmentManager() *segmentManager {
@@ -424,6 +432,39 @@ func (mgr *segmentManager) GetLogicalResource() ResourceUsage {
 	return mgr.logicalResource
 }
 
+func (mgr *segmentManager) AddLoadedBinlogSize(size int64) {
+	mgr.loadedBinlogSize.Add(size)
+}
+
+func (mgr *segmentManager) SubLoadedBinlogSize(size int64) {
+	// Clamp to zero to avoid negative values on concurrent or duplicate subtractions
+	for {
+		current := mgr.loadedBinlogSize.Load()
+		newVal := current - size
+		if newVal < 0 {
+			newVal = 0
+		}
+		if mgr.loadedBinlogSize.CompareAndSwap(current, newVal) {
+			if current < size {
+				log.Warn("Loaded binlog size subtraction exceeds current value, clamped to 0",
+					zap.Int64("current", current),
+					zap.Int64("subtracted", size))
+			}
+			return
+		}
+		// retry on CompareAndSwap failure
+	}
+}
+
+func (mgr *segmentManager) GetLoadedBinlogSize() int64 {
+	current := mgr.loadedBinlogSize.Load()
+	if current < 0 {
+		log.Warn("Loaded binlog size is negative, returning 0", zap.Int64("current", current))
+		return 0
+	}
+	return current
+}
+
 // put is the internal put method updating both global segments and secondary index.
 func (mgr *segmentManager) put(ctx context.Context, segmentType SegmentType, segment Segment) {
 	mgr.globalSegments.Put(ctx, segmentType, segment)

internal/querynodev2/segments/manager_test.go

@@ -190,3 +190,30 @@ func (s *ManagerSuite) TestIncreaseVersion() {
 func TestManager(t *testing.T) {
 	suite.Run(t, new(ManagerSuite))
 }
+
+func TestLoadedBinlogSizeAccounting(t *testing.T) {
+	m := NewSegmentManager()
+	if got := m.GetLoadedBinlogSize(); got != 0 {
+		t.Fatalf("expected initial 0, got %d", got)
+	}
+
+	m.AddLoadedBinlogSize(100)
+	if got := m.GetLoadedBinlogSize(); got != 100 {
+		t.Fatalf("expected 100 after add, got %d", got)
+	}
+
+	m.AddLoadedBinlogSize(50)
+	if got := m.GetLoadedBinlogSize(); got != 150 {
+		t.Fatalf("expected 150 after add, got %d", got)
+	}
+
+	m.SubLoadedBinlogSize(20)
+	if got := m.GetLoadedBinlogSize(); got != 130 {
+		t.Fatalf("expected 130 after sub, got %d", got)
+	}
+
+	m.SubLoadedBinlogSize(1000)
+	if got := m.GetLoadedBinlogSize(); got != 0 {
+		t.Fatalf("expected clamp to 0, got %d", got)
+	}
+}

internal/querynodev2/segments/mock_segment_manager.go

@@ -312,6 +312,7 @@ type LocalSegment struct {
 
 	// cached results, to avoid too many CGO calls
 	memSize     *atomic.Int64
+	binlogSize  *atomic.Int64
 	rowNum      *atomic.Int64
 	insertCount *atomic.Int64
 
@@ -389,6 +390,7 @@ func NewSegment(ctx context.Context,
 		fieldJSONStats:     make(map[int64]*querypb.JsonStatsInfo),
 
 		memSize:     atomic.NewInt64(-1),
+		binlogSize:  atomic.NewInt64(0),
 		rowNum:      atomic.NewInt64(-1),
 		insertCount: atomic.NewInt64(0),
 	}
@@ -1352,10 +1354,17 @@ func (s *LocalSegment) CreateTextIndex(ctx context.Context, fieldID int64) error
 }
 
 func (s *LocalSegment) FinishLoad() error {
+	err := s.csegment.FinishLoad()
+	if err != nil {
+		return err
+	}
 	// TODO: disable logical resource handling for now
 	// usage := s.ResourceUsageEstimate()
 	// s.manager.AddLogicalResource(usage)
-	return s.csegment.FinishLoad()
+	binlogSize := calculateSegmentMemorySize(s.LoadInfo())
+	s.manager.AddLoadedBinlogSize(binlogSize)
+	s.binlogSize.Store(binlogSize)
+	return nil
 }
 
 type ReleaseScope int
@@ -1424,6 +1433,13 @@ func (s *LocalSegment) Release(ctx context.Context, opts ...releaseOption) {
 	// usage := s.ResourceUsageEstimate()
 	// s.manager.SubLogicalResource(usage)
 
+	binlogSize := s.binlogSize.Load()
+	if binlogSize > 0 {
+		// no concurrent change to s.binlogSize, so the subtraction is safe
+		s.manager.SubLoadedBinlogSize(binlogSize)
+		s.binlogSize.Store(0)
+	}
+
 	log.Info("delete segment from memory")
 }
 

internal/querynodev2/segments/segment.go

@@ -244,6 +244,24 @@ func calculateSegmentLogSize(segmentLoadInfo *querypb.SegmentLoadInfo) int64 {
 	return segmentSize
 }
 
+func calculateSegmentMemorySize(segmentLoadInfo *querypb.SegmentLoadInfo) int64 {
+	segmentSize := int64(0)
+
+	for _, fieldBinlog := range segmentLoadInfo.BinlogPaths {
+		segmentSize += getBinlogDataMemorySize(fieldBinlog)
+	}
+
+	for _, fieldBinlog := range segmentLoadInfo.Statslogs {
+		segmentSize += getBinlogDataMemorySize(fieldBinlog)
+	}
+
+	for _, fieldBinlog := range segmentLoadInfo.Deltalogs {
+		segmentSize += getBinlogDataMemorySize(fieldBinlog)
+	}
+
+	return segmentSize
+}
+
 func getFieldSizeFromFieldBinlog(fieldBinlog *datapb.FieldBinlog) int64 {
 	fieldSize := int64(0)
 	for _, binlog := range fieldBinlog.Binlogs {

internal/querynodev2/segments/utils.go

@@ -1378,6 +1378,22 @@ func (q *QuotaCenter) checkDiskQuota(denyWritingDBs map[int64]struct{}) error {
 		return err
 	}
 
+	// check disk quota of loaded collections
+	totalLoadedDiskQuota := Params.QuotaConfig.LoadedDiskQuota.GetAsFloat()
+	totalLoaded := 0.0
+	for _, queryNodeMetrics := range q.queryNodeMetrics {
+		// for streaming node, queryNodeMetrics.LoadedBinlogSize is always 0
+		totalLoaded += float64(queryNodeMetrics.LoadedBinlogSize)
+	}
+	if totalLoaded >= totalLoadedDiskQuota {
+		log.RatedWarn(10, "cluster loaded disk quota exceeded", zap.Float64("total loaded", totalLoaded), zap.Float64("total loaded disk quota", totalLoadedDiskQuota))
+		err := q.forceDenyWriting(commonpb.ErrorCode_DiskQuotaExhausted, true, nil, nil, nil)
+		if err != nil {
+			log.Warn("fail to force deny writing", zap.Error(err))
+		}
+		return err
+	}
+
 	collectionDiskQuota := Params.QuotaConfig.DiskQuotaPerCollection.GetAsFloat()
 	dbSizeInfo := make(map[int64]int64)
 	collections := make([]int64, 0)
@@ -1434,7 +1450,7 @@ func (q *QuotaCenter) checkDiskQuota(denyWritingDBs map[int64]struct{}) error {
 func (q *QuotaCenter) checkDBDiskQuota(dbSizeInfo map[int64]int64) []int64 {
 	log := log.Ctx(context.Background()).WithRateGroup("rootcoord.QuotaCenter", 1.0, 60.0)
 	dbIDs := make([]int64, 0)
-	checkDiskQuota := func(dbID, binlogSize int64, quota float64) {
+	appendIfExceeded := func(dbID, binlogSize int64, quota float64) {
 		if float64(binlogSize) >= quota {
 			log.RatedWarn(10, "db disk quota exceeded",
 				zap.Int64("db", dbID),
@@ -1451,7 +1467,7 @@ func (q *QuotaCenter) checkDBDiskQuota(dbSizeInfo map[int64]int64) []int64 {
 			if dbDiskQuotaStr := db.GetProperty(common.DatabaseDiskQuotaKey); dbDiskQuotaStr != "" {
 				if dbDiskQuotaBytes, err := strconv.ParseFloat(dbDiskQuotaStr, 64); err == nil {
 					dbDiskQuotaMB := dbDiskQuotaBytes * 1024 * 1024
-					checkDiskQuota(dbID, binlogSize, dbDiskQuotaMB)
+					appendIfExceeded(dbID, binlogSize, dbDiskQuotaMB)
 					continue
 				} else {
 					log.Warn("invalid configuration for diskQuota.mb",
@@ -1460,7 +1476,7 @@ func (q *QuotaCenter) checkDBDiskQuota(dbSizeInfo map[int64]int64) []int64 {
 				}
 			}
 		}
-		checkDiskQuota(dbID, binlogSize, Params.QuotaConfig.DiskQuotaPerDB.GetAsFloat())
+		appendIfExceeded(dbID, binlogSize, Params.QuotaConfig.DiskQuotaPerDB.GetAsFloat())
 	}
 	return dbIDs
 }