fallback to check master

weed/server/filer_grpc_server.go

@@ -6,6 +6,7 @@ import (
 	"os"
 	"path/filepath"
 	"strconv"
+	"strings"
 	"time"
 
 	"github.com/seaweedfs/seaweedfs/weed/cluster"
@@ -94,17 +95,23 @@ func (fs *FilerServer) LookupVolume(ctx context.Context, req *filer_pb.LookupVol
 		LocationsMap: make(map[string]*filer_pb.Locations),
 	}
 
+	// Collect volume IDs that are not in cache for batch lookup
+	var vidsToLookup []string
+	vidMap := make(map[string]uint32)
+
 	for _, vidString := range req.VolumeIds {
 		vid, err := strconv.Atoi(vidString)
 		if err != nil {
-			glog.V(1).InfofCtx(ctx, "Unknown volume id %d", vid)
+			glog.V(1).InfofCtx(ctx, "Unknown volume id %s", vidString)
 			return nil, err
 		}
-		var locs []*filer_pb.Location
+		vidMap[vidString] = uint32(vid)
+		
+		// Check cache first
 		locations, found := fs.filer.MasterClient.GetLocations(uint32(vid))
-		if !found {
-			continue
-		}
+		if found && len(locations) > 0 {
+			// Found in cache
+			var locs []*filer_pb.Location
 			for _, loc := range locations {
 				locs = append(locs, &filer_pb.Location{
 					Url:        loc.Url,
@@ -116,6 +123,58 @@ func (fs *FilerServer) LookupVolume(ctx context.Context, req *filer_pb.LookupVol
 			resp.LocationsMap[vidString] = &filer_pb.Locations{
 				Locations: locs,
 			}
+		} else {
+			// Not in cache, need to query master
+			vidsToLookup = append(vidsToLookup, vidString)
+		}
+	}
+
+	// Query master for volumes not in cache
+	if len(vidsToLookup) > 0 {
+		glog.V(2).InfofCtx(ctx, "Looking up %d volumes from master: %v", len(vidsToLookup), vidsToLookup)
+		err := operation.WithMasterServerClient(false, fs.filer.GetMaster(ctx), fs.grpcDialOption, func(masterClient master_pb.SeaweedClient) error {
+			masterResp, err := masterClient.LookupVolume(ctx, &master_pb.LookupVolumeRequest{
+				VolumeOrFileIds: vidsToLookup,
+			})
+			if err != nil {
+				return fmt.Errorf("master lookup failed: %v", err)
+			}
+
+			// Process master response
+			for _, vidLoc := range masterResp.VolumeIdLocations {
+				if vidLoc.Error != "" {
+					glog.V(0).InfofCtx(ctx, "volume %s lookup error: %s", vidLoc.VolumeOrFileId, vidLoc.Error)
+					continue
+				}
+				
+				vidString := vidLoc.VolumeOrFileId
+				// Parse volume ID from response (could be "123" or "123,abc")
+				parts := strings.Split(vidString, ",")
+				vidOnly := parts[0]
+
+				var locs []*filer_pb.Location
+				for _, masterLoc := range vidLoc.Locations {
+					locs = append(locs, &filer_pb.Location{
+						Url:        masterLoc.Url,
+						PublicUrl:  masterLoc.PublicUrl,
+						GrpcPort:   masterLoc.GrpcPort,
+						DataCenter: masterLoc.DataCenter,
+					})
+				}
+				
+				if len(locs) > 0 {
+					resp.LocationsMap[vidOnly] = &filer_pb.Locations{
+						Locations: locs,
+					}
+				}
+			}
+			return nil
+		})
+		
+		if err != nil {
+			glog.V(0).InfofCtx(ctx, "failed to lookup volumes from master: %v", err)
+			// Don't return error, return partial results
+		}
 	}
 
 	return resp, nil