enhance: skip load bm25 sparse row data

internal/querynodev2/segments/segment.go

@@ -62,6 +62,7 @@
 	"github.com/milvus-io/milvus/pkg/util/indexparams"
 	"github.com/milvus-io/milvus/pkg/util/merr"
 	"github.com/milvus-io/milvus/pkg/util/metautil"
+	"github.com/milvus-io/milvus/pkg/util/metric"
 	"github.com/milvus-io/milvus/pkg/util/paramtable"
 	"github.com/milvus-io/milvus/pkg/util/timerecord"
 	"github.com/milvus-io/milvus/pkg/util/typeutil"
@@ -1054,10 +1055,24 @@
 				return err
 			}
 			updateIndexInfoSpan := tr.RecordSpan()
+			// Skip warnup chunk cache when
+			// . scalar data
+			// . index has row data
+			// . vector was bm25 function output
+
 			if !typeutil.IsVectorType(fieldType) || s.HasRawData(indexInfo.GetFieldID()) {
 				return nil
 			}
 
+			metricType, err := funcutil.GetAttrByKeyFromRepeatedKV(common.MetricTypeKey, indexInfo.IndexParams)
+			if err != nil {
+				return fmt.Errorf("metric type not exist in index params")
+			}
+
+			if metricType == metric.BM25 {
+				return nil
+			}
+
 			// 4.
 			mmapChunkCache := paramtable.Get().QueryNodeCfg.MmapChunkCache.GetAsBool()
 			s.WarmupChunkCache(ctx, indexInfo.GetFieldID(), mmapChunkCache)

internal/querynodev2/segments/segment_loader.go

@@ -57,6 +57,7 @@
 	"github.com/milvus-io/milvus/pkg/util/funcutil"
 	"github.com/milvus-io/milvus/pkg/util/hardware"
 	"github.com/milvus-io/milvus/pkg/util/merr"
+	"github.com/milvus-io/milvus/pkg/util/metric"
 	"github.com/milvus-io/milvus/pkg/util/paramtable"
 	"github.com/milvus-io/milvus/pkg/util/syncutil"
 	"github.com/milvus-io/milvus/pkg/util/timerecord"
@@ -1509,12 +1510,22 @@
 			if !estimateResult.HasRawData && !isVectorType {
 				shouldCalculateDataSize = true
 			}
+
 			if !estimateResult.HasRawData && isVectorType {
-				mmapChunkCache := paramtable.Get().QueryNodeCfg.MmapChunkCache.GetAsBool()
-				if mmapChunkCache {
-					segmentDiskSize += binlogSize
-				} else {
-					segmentMemorySize += binlogSize
+				metricType, err := funcutil.GetAttrByKeyFromRepeatedKV(common.MetricTypeKey, fieldIndexInfo.IndexParams)
+				if err != nil {
+					return nil, errors.Wrapf(err, "failed to estimate resource usage of index, metric type nout found, collection %d, segment %d, indexBuildID %d",
+						loadInfo.GetCollectionID(),
+						loadInfo.GetSegmentID(),
+						fieldIndexInfo.GetBuildID())
+				}
+				if metricType != metric.BM25 {
+					mmapChunkCache := paramtable.Get().QueryNodeCfg.MmapChunkCache.GetAsBool()
+					if mmapChunkCache {
+						segmentDiskSize += binlogSize
+					} else {
+						segmentMemorySize += binlogSize
+					}
 				}
 			}
 		} else {