await producer.ProduceAsync() never return

Description

In a C# Windows service application, await producer.ProduceAsync() never return. but the message have sent and consumer received it. This issue both occurred in Confluent.Kafka nuget package of 0.11.6 & 1.0.0 beta3.

Add: Just tested other version and found:

• Confluent.Kafka 0.11.2 & librdkkafka.redist 0.11.1: Works
• Confluent.Kafka 0.11.3 & librdkkafka.redist 0.11.3: Works
• Confluent.Kafka 0.11.4 & librdkkafka.redist 0.11.4: Does not works
• Confluent.Kafka 0.11.5 & librdkkafka.redist 0.11.5: Does not works
• Confluent.Kafka 0.11.6 & librdkkafka.redist 0.11.6: Does not works

How to reproduce

var config = new ProducerConfig
 {
      BootstrapServers = "server:9092",
      MessageTimeoutMs = 5000
};
var _producer = new ProducerBuilder<Null, string>(config).Build();

var message = new { Time = DateTime.Now };

LogHelper.Debug("Producer start...");

await _producer.ProduceAsync("myTopic", new Message<Null, string>{ Value = JsonConvert.SerializeObject(message)});

LogHelper.Debug("Producer end...");   //this line never executed

Checklist

Please provide the following information:

• Confluent.Kafka nuget version: 0.11.6 & 1.0.0-beta3
• Apache Kafka version: 2.11
• Client configuration: .NET Framework 4.6.2
• Operating system: Windows Server 2016
• Provide logs (with “debug” : “…” as necessary in configuration)
• Provide broker log excerpts
• Critical issue

[mhowlett]

thanks for confirming @cmills2000 - the power of open source at work! I plan to get this resolved before the next release.

[raldes]

I had the same error “await producer async never return”. The cause was SSL wrong configuration. My recomendation: set the Debug config property to “all” and see the log