smbecker opened a new issue, #260:
URL: https://github.com/apache/pulsar-dotpulsar/issues/260
### Description
I have a topic that was created using `NewConsumer(Schema.String)`. However,
for retries and dead letters, I frequently create the producers using
`NewProducer()` since I don't want to pay the `Encode`/`Decode` penalty since
it is just forwarding the message data from the consumer into the retry queue.
After upgrading to 4.2, I noticed that my retry producers were faulting with a
`IncompatibleSchemaException`.
### Reproduction Steps
```c#
[Fact]
public async Task can_publish_retry_to_consumer() {
var pulsarContainer = new PulsarBuilder().Build();
await pulsarContainer.StartAsync();
try {
await using var client = PulsarClient.Builder()
.ServiceUrl(new Uri(pulsarContainer.GetBrokerAddress()))
.Build();
await using var originProducer =
client.NewProducer(Schema.String)
.Topic("persistent://public/default/test")
.Create();
await using var originConsumer =
client.NewConsumer(Schema.String)
.Topic("persistent://public/default/test")
.SubscriptionName("test")
.SubscriptionType(SubscriptionType.Exclusive)
.Create();
await using var retryProducer = client.NewProducer()
.Topic("persistent://public/default/test")
.Create();
await originProducer.Send("test");
var testMessage = await originConsumer.Receive();
Assert.Equal("test", testMessage.Value());
await retryProducer.Send(testMessage.Data);
testMessage = await originConsumer.Receive();
Assert.Equal("test", testMessage.Value());
} finally {
await pulsarContainer.StopAsync();
}
}
```
### Expected behavior
Technically, this is more accurate in creating the topic with the correct
schema. However, it is a change in behavior and not one that was expected.
Perhaps a flag that allows you to opt-out of setting the schema at the
server-side topic level to preserve the old behavior.
### Actual behavior
Throws a `ProducerFaultedException` with the following as the
`InnerException`:
```
DotPulsar.Exceptions.IncompatibleSchemaException:
org.apache.pulsar.broker.service.schema.exceptions.IncompatibleSchemaException:
Incompatible schema: exists schema type STRING, new schema type NONE caused by
org.apache.pulsar.broker.service.schema.exceptions.IncompatibleSchemaException:
Incompatible schema: exists schema type STRING, new schema type NONE
```
### Regression?
I would consider this a regression as it is a change in behavior and not one
that was expected.
### Known Workarounds
One workaround is to create all producers and consumers using
`ReadOnlySequence<byte>` and handle encoding and decoding yourself. Another
workaround is to create a new `ISchema<string>` with
`Schema.ByteSequence.SchemaInfo`.
```c#
private sealed class CustomStringSchema : ISchema<string>
{
public static ISchema<string> Instance { get; } = new
CustomStringSchema();
public SchemaInfo SchemaInfo => Schema.ByteSequence.SchemaInfo;
public string Decode(ReadOnlySequence<byte> bytes, byte[]?
schemaVersion = null) {
return Schema.String.Decode(bytes, schemaVersion);
}
public ReadOnlySequence<byte> Encode(string message) {
return Schema.String.Encode(message);
}
}
```
### Configuration
* Which version of .NET is the code running on? `net9.0`
* Which version of DotPulsar are you using? `4.2.0`
* What OS and version, and what distro if applicable? `Ubuntu 24.04`
* What is the architecture (x64, x86, ARM, ARM64)? `x64`
* Do you know whether it is specific to that configuration? It doesn't
appear to be related to OS/.NET configuration at all. It seems to be a breaking
change from [this PR](https://github.com/apache/pulsar-dotpulsar/pull/253)
### Other information
_No response_
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