hdfsBuilderSetPrincipal doesn't work

Hi Team,
I got an error like this :
```
2021-03-14 14:10:20.339761, p16581, th139969607461248, INFO Retrying connect to server: "hadoopc1h5:25000". Already tried 9 time(s)
2021-03-14 14:10:22.359599, p16581, th139969607461248, ERROR Failed to setup RPC connection to "hadoopc1h5:25000" caused by:
RpcChannel.cpp: 747: Problem with callback handler
@ Hdfs::Internal::UnWrapper::unwrap(char const*, int)
@ Hdfs::Internal::UnWrapper::unwrap(char const*, int)
@ Hdfs::Internal::UnWrapper::unwrap(char const*, int)
@ Hdfs::Internal::UnWrapper::unwrap(char const*, int)
@ Hdfs::Internal::UnWrapper::unwrap(char const*, int)
@ Hdfs::Internal::HandlerRpcResponseException(std::__exception_ptr::exception_ptr)
@ Hdfs::Internal::RpcChannelImpl::readOneResponse(bool) [clone .cold]
@ Hdfs::Internal::RpcChannelImpl::setupSaslConnection()
@ Hdfs::Internal::RpcChannelImpl::connect()
@ Hdfs::Internal::RpcChannelImpl::invokeInternal(std::shared_ptr)
@ Hdfs::Internal::RpcChannelImpl::invoke(Hdfs::Internal::RpcCall const&)
@ Hdfs::Internal::NamenodeImpl::invoke(Hdfs::Internal::RpcCall const&)
@ Hdfs::Internal::NamenodeImpl::getFsStats()
@ Hdfs::Internal::NamenodeProxy::getFsStats()
@ Hdfs::Internal::FileSystemImpl::getFsStats()
@ Hdfs::Internal::FileSystemImpl::connect()
@ Hdfs::FileSystem::connect(char const*, char const*, char const*)
@ hdfsBuilderConnect
@ main
@ __libc_start_main
@ Unknown
```
and my code and hdfs conf :
```
int main() {
hdfsBuilder* builder = hdfsNewBuilder();
hdfsBuilderSetNameNode(builder, schemaAddress.c_str());
hdfsBuilderSetForceNewInstance(builder);

hdfsBuilderSetPrincipal(builder, "ossuser");

std::stringstream ss;
ss.imbue(std::locale::classic());
ss << "/tmp/krb5cc_0";
std::cout << ss.str() << std::endl;
const char * userCCpath = GetEnv("LIBHDFS3_TEST_USER_CCPATH", ss.str().c_str());
hdfsBuilderSetKerbTicketCachePath(builder, userCCpath);

hdfsFS hdfs = hdfsBuilderConnect(builder);
if (!hdfs) {
die("Could not connect to HDFS server \"" << schemaAddress << "\": " << thrill::vfs::HdfsGetLastError());
}

std::cout << "success connect to hdfs!!!!!!!!!!!" << std::endl;

return 1;
}
```
hdfs-client.xml
```

hadoop.security.authentication
kerberos

the RPC authentication method, valid values include "simple" or "kerberos". default is "simple"

```
klist shows:
```
Ticket cache: FILE:/tmp//krb5cc_0
Default principal: ossuser@HADOOP.COM

Valid starting Expires Service principal
03/14/21 14:09:56 03/15/21 14:09:56 krbtgt/HADOOP.COM@HADOOP.COM
03/14/21 14:10:05 03/15/21 14:09:56 hdfs/hadoop.hadoop.com@HADOOP.COM
```
Am I use the hdfsBuilderSetPrincipal in the wrong way?
Can you please give me some example or reference how to use libhdfs3 to connect kerberized cluster?

Appreciate your support!
Thanks!