discovery: use thanos resolver for endpoint groups #7565
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MichaHoffmann
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| @@ -891,14 +906,12 @@ func prepareEndpointSet( | |||
| } | |||
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| for _, eg := range endpointGroupAddrs { | |||
| addr := fmt.Sprintf("dns:///%s", eg) | |||
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Note: this is a breaking change; its so that people can chose to keep previous behavior by adding "dns:///" prefix or opt into thanos resolver by adding "thanos:///" prefix; alternatively we could snoop if thanos:/// is added and if not add dns:/// or just add "thanos:///" by default, in theory it should be not noticeable mostly. I like it better to state the resolver explicitely here.
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What's the main difference between the Thanos DNS resolver and the default DNS resolver we are using?
Trying to understand if it is a big difference. If it is, then I think the detection is needed and if no prefix is added we can still default to dns://. If there is no big difference I think I am fine either way
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The thanos one understands our "dnssrv+" stuff while the dns one does not. Otherwise it should be roughly the same.
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Is this true? I remember it resolves every 30 min. But still almost unusable. |
Yeah the resolver per connection runs in a loop and updates the addresses for it every configured SD interval like normal endpoint too |
This is my understanding based on grpc/grpc#12295, but yes, even 30 minutes is very long. |
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Signed-off-by: Michael Hoffmann <mhoffm@posteo.de>
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Test is flaky on main right now, merging. |
Endpoint Groups behave differently from regular endpoints right now. Regular endpoints are resolved periodically by our own resolvers but endpoint groups use the grpc "dns:///" resolver. This PR adds a "thanos:///" resolver that remedies this.
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