check whether shares the same filer store

weed/filer/meta_aggregator.go

@@ -139,3 +139,15 @@ func (ma *MetaAggregator) subscribeToOneFiler(f *Filer, self string, filer strin
 		}
 	}
 }
+
+func (ma *MetaAggregator) isSameFilerStore(f *Filer, peer string) (isSame bool, err error) {
+	err = pb.WithFilerClient(peer, ma.grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
+		resp, err := client.GetFilerConfiguration(context.Background(), &filer_pb.GetFilerConfigurationRequest{})
+		if err != nil {
+			return err
+		}
+		isSame = f.Signature == resp.Signature
+		return nil
+	})
+	return
+}