lbradstreet commented on pull request #10704:
URL: https://github.com/apache/kafka/pull/10704#issuecomment-841831977
@ijuma I'm admittedly very confused by this too. I followed the producer
configs through everywhere it's passed and can't see anywhere that it seems
likely to be called concurrently. There are a few places that seem suspicious
(channel builder code, etc) by the time it calls logUnused.
`doSend` will use it later on, but by then the constructor will have had to
have returned:
```
try {
serializedKey = keySerializer.serialize(record.topic(),
record.headers(), record.key());
} catch (ClassCastException cce) {
throw new SerializationException("Can't convert key of class
" + record.key().getClass().getName() +
" to class " +
producerConfig.getClass(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG).getName() +
" specified in key.serializer", cce);
}
```
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