DNS does not update

[bladefist]

Pretty simple report, if you use collector.example.com and you change that dns to point to another IP, the collector will not update until you cycle the app.

[russorat]

@bladefist thanks for the issue. In other client libs you've used, is this option configurable or always on?

[bladefist]

I'm not sure as I would never cheat on this repository. I will say this is an issue that has come up before when using HttpClient (I assume this repo uses it). There are some easy fixes. If you're using a singleton it can be re-instated periodically. There are other solutions but I will admit I'm not an expert on it. thanks!

[bednar]

Hi @bladefist,

I've been investigate how to fix it and it is a little bit complicated than it looks like. As you assume we are using a singleton:

influxdb-csharp/src/InfluxDB.LineProtocol/Client/LineProtocolClient.cs

Line 36 in fe041d7

_httpClient = new HttpClient(handler) { BaseAddress = serverBaseAddress };

so re-instated periodically is possible but it seems to me a too tricky 😄.

The next option is use a ServicePoint.ConnectionLeaseTimeout but it looks that it isn't supported on all platforms.

• https://docs.microsoft.com/en-us/dotnet/api/system.net.servicepoint.connectionleasetimeout?redirectedfrom=MSDN&view=netstandard-2.0
• ServicePoint.ConnectionLeaseTimeout throws NotImplementedException dotnet/standard#642
• http://byterot.blogspot.com/2016/07/singleton-httpclient-dns.html

Regards

[sgtfrankieboy]

Starting from .NET Core 2.1 its possible to use IHttpClientFactory to handle the creation and recycling of the HttpClient/HttpMessageHandler, solving the DNS issue. An issue is that its coupled with Microsoft.Extensions.DependencyInjection.

[wbaldoumas]

Any updates on this issue? We ran into this exact problem on my team yesterday and it bit us pretty hard. We're using v1.1.0.