System.DllNotFoundException: Failed to load the librdkafka native library

An error occurred using the Dotnet core Web API Errors are as follows

Microsoft.AspNetCore.Server.Kestrel[13] Connection id “0HL9RN5T1D654”, Request id “0HL9RN5T1D654:00000001”: An unhandled exception was thrown by the application. System.DllNotFoundException: Failed to load the librdkafka native library. at Confluent.Kafka.Impl.LibRdKafka.Initialize(String userSpecifiedPath) at Confluent.Kafka.Producer…ctor(IEnumerable1 config, Boolean manualPoll, Boolean disableDeliveryReports) at Confluent.Kafka.Producer2…ctor(IEnumerable1 config, ISerializer1 keySerializer, ISerializer`1 valueSerializer, Boolean manualPoll, Boolean disableDeliveryReports)

How to reproduce

Use Asp.net Core WebApi on Centos7

Issue Analytics

State:
Created 6 years ago
Comments:36 (15 by maintainers)

Top GitHub Comments

6reactions

glazkovalexcommented, Feb 12, 2019

Hi guys, I am trying to do exactly what @sfrooster said - building netstandard2.0 lib used by a netcoreapp2.0 console app and it fails with aforementioned error on Windows 10, is there any resolution/solution to this yet?

I was helped with this code before creating the producer

try
{
	_producer = builder.Build();
}
catch (DllNotFoundException)
{   // Загрузка злоебучей librdkafka.dll
	if (!Library.IsLoaded)
	{
		var pathToLibrd = System.IO.Path.Combine(System.IO.Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().Location),
			$"librdkafka\\{(Environment.Is64BitOperatingSystem ? "x64" : "x86")}\\librdkafka.dll");
		_log.Info($"librdkafka is not loaded. Trying to load {pathToLibrd}");
		Library.Load(pathToLibrd);
		_log.Info($"Using librdkafka version: {Library.Version}");
	}
	_producer = builder.Build();
}

3reactions

sfroostercommented, Mar 9, 2018

@mhowlett “brew install openssl” fixed everything such that he also no longer needs to explicitly call Load.

As for versions, he’s on osx 10.13.3, dotnet cli 2.2-preview/2.1, mono 5.8, Confluent.Kafka 0.11.3, building a netstandard2.0 lib used by a netcoreapp2.0 console app.