If you open an OTLP receiver in port 4317, another one is opened on port 55680

[mirath]

opentelemetry-collector/receiver/otlpreceiver/otlp.go

Line 129 in e6319ac

if r.cfg.GRPC.NetAddr.Endpoint == defaultGRPCEndpoint {

Currently if you open an OTLP receiver on port 4317, the code is wired to open an extra one in 55680.

I guess that this was meant as a legacy or backwards compatible feature, but it can trip setups that trying to use 55680 for other uses (it tripped me up while I was doing a proof of concept).

In general I think this is very unintuitive behaviour that is rather tricky to debug.

[pmm-sumo]

BTW, this was done intentionally as part of #2104 for the transition period

[alolita]

@bogdandrutu @bhautikpip submitted a PR to remove support for port 55680. If we decide to deprecate this port, we should do this before GA. Please advise.

cc: @mxiamxia can you please take a look based on what we hear from @bogdandrutu

[bogdandrutu]

@alolita I think we need to agree on the right thing to do here. probably we should discuss this during SIG meeting to achieve agreement.

The first goal is to make a decision.

To understand: "If we release with this it means we have to always support this behavior"

[alolita]

Action Item: We should scan and remove all references in the code and docs to the old port before GA. If we find a reference, file an issue, we will need to fix it.

See: https://github.com/search?q=org%3Aopen-telemetry+55680&type=code

[mxiamxia]

OTel Repos need to be updated.

• opentelemetry-erlang - https://github.com/open-telemetry/opentelemetry-erlang/search?q=55680
  • Remove the OTLP receiver legacy gRPC port(55680) references opentelemetry-erlang#250
• opentelemetry-collector - https://github.com/open-telemetry/opentelemetry-collector/search?q=55680
  • remove legacy grpc receiver endpoint for GA release #3256
• opentelemetry-collector-contrib - https://github.com/open-telemetry/opentelemetry-collector-contrib/search?q=55680
  • Remove the OTLP receiver legacy gRPC port(55680) references opentelemetry-collector-contrib#3452
• opentelemetry-js-contrib - https://github.com/open-telemetry/opentelemetry-js-contrib/search?q=55680
  • Remove the OTLP receiver legacy gRPC port(55680) references opentelemetry-js-contrib#500
• opentelemetry.io - https://github.com/open-telemetry/opentelemetry.io/search?q=55680
  • Remove the OTLP receiver legacy gRPC port(55680) references opentelemetry.io#588
• opentelemetry-swift - https://github.com/open-telemetry/opentelemetry-swift/search?q=55680
  • Remove the OTLP receiver legacy gRPC port(55680) references opentelemetry-swift#190
• opentelemetry-cpp-contrib - https://github.com/open-telemetry/opentelemetry-cpp-contrib/search?q=55680
  • Remove the OTLP receiver legacy gRPC port(55680) references opentelemetry-cpp-contrib#29
• opentelemetry-operator - https://github.com/open-telemetry/opentelemetry-operator/search?q=55680
  • Remove the OTLP receiver legacy gRPC port(55680) references opentelemetry-operator#293
• opentelemetry-java-instrumentation - https://github.com/open-telemetry/opentelemetry-java-instrumentation/search?q=55680
• opentelemetry-ruby - https://github.com/open-telemetry/opentelemetry-ruby/search?q=55680
  • Remove the OTLP receiver legacy gRPC port(55680) references opentelemetry-ruby#766
• opentelemetry-java-contrib - https://github.com/open-telemetry/opentelemetry-java-contrib/search?q=55680
  • Remove the OTLP receiver legacy gRPC port(55680) references opentelemetry-java-contrib#37
• opentelemetry-java - https://github.com/open-telemetry/opentelemetry-java/search?q=55680
  • Remove the OTLP receiver legacy gRPC port(55680) references opentelemetry-java#3245

[mxiamxia]

Removed all the legacy port(55680) mentions across the OpenTelemetry repos. The port will be disabled in OTel Collector v0.30.0 per the discussion below.

#3256 (comment)

[alolita]

This is completed from an implementation standpoint so I will close this issue. I will open another issue to track user feedback until the Collector reaches version 0.30.0 when this port will be disabled.