final String bulkToken,
final byte[] startRow) throws IOException {
// we never want to send a batch of HFiles to all regions, thus cannot call
// HTable#coprocessorService methods that take start and end rowkeys; see HBASE-9639
try {
CoprocessorRpcChannel channel = table.coprocessorService(startRow);
SecureBulkLoadProtos.SecureBulkLoadService instance =
ProtobufUtil.newServiceStub(SecureBulkLoadProtos.SecureBulkLoadService.class, channel);
SecureBulkLoadProtos.DelegationToken protoDT =
SecureBulkLoadProtos.DelegationToken.newBuilder().build();