fix: Configure keepAlive time for gRPC TCP connections

Author: sakthivelmanii

spanner/client.go

@@ -44,6 +44,7 @@ import (
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/credentials/insecure"
 	"google.golang.org/grpc/encoding/gzip"
+	"google.golang.org/grpc/keepalive"
 	"google.golang.org/grpc/metadata"
 	"google.golang.org/grpc/peer"
 	"google.golang.org/grpc/status"
@@ -683,6 +684,7 @@ func allClientOpts(numChannels int, compression string, userOpts ...option.Clien
 		option.WithUserAgent(fmt.Sprintf("spanner-go/v%s", internal.Version)),
 		option.WithGRPCDialOption(grpc.WithChainUnaryInterceptor(addNativeMetricsInterceptor()...)),
 		option.WithGRPCDialOption(grpc.WithChainStreamInterceptor(addStreamNativeMetricsInterceptor()...)),
+		option.WithGRPCDialOption(grpc.WithKeepaliveParams(keepalive.ClientParameters{Time: 120 * time.Second})),
 	}
 	if enableDirectPathXds, _ := strconv.ParseBool(os.Getenv("GOOGLE_SPANNER_ENABLE_DIRECT_ACCESS")); enableDirectPathXds {
 		clientDefaultOpts = append(clientDefaultOpts, internaloption.AllowNonDefaultServiceAccount(true))