lightning: unlimited grpc MaxCallRecvMsgSize for TikvImporter (pingcap#56771)

close pingcap#56114

Author: fishiu

br/pkg/lightning/backend/local/local.go

@@ -113,6 +113,9 @@ var (
 	// MaxWriteAndIngestRetryTimes is the max retry times for write and ingest.
 	// A large retry times is for tolerating tikv cluster failures.
 	MaxWriteAndIngestRetryTimes = 30
+
+	// Unlimited RPC receive message size for TiKV importer
+	unlimitedRPCRecvMsgSize = math.MaxInt32
 )
 
 // ImportClientFactory is factory to create new import client for specific store.
@@ -166,6 +169,7 @@ func (f *importClientFactoryImpl) makeConn(ctx context.Context, storeID uint64)
 		addr = store.GetAddress()
 	}
 	opts = append(opts,
+		grpc.WithDefaultCallOptions(grpc.MaxCallRecvMsgSize(unlimitedRPCRecvMsgSize)),
 		grpc.WithConnectParams(grpc.ConnectParams{Backoff: bfConf}),
 		grpc.WithKeepaliveParams(keepalive.ClientParameters{
 			Time:                gRPCKeepAliveTime,