BewareMyPower commented on issue #7682:
URL: https://github.com/apache/pulsar/issues/7682#issuecomment-684182030
@jiazhai Looks like the cpp client's error is just caused by the broker.
```c++
// ClientConnection.cc
case BaseCommand::ERROR: {
const CommandError& error = incomingCmd_.error();
Result result = getResult(error.error());
LOG_WARN(cnxString_ << "Received error response from
server: " << result
<< " -- req_id: " <<
error.request_id());
```
The broker gave an unknown `ServerError` or just an `UnknownError` when
processing the subscribe command.
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