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Contributing to the OpenTelemetry Protocol with Apache Arrow project

We want to make contributing to this project as easy and transparent as possible. Please see the OpenTelemetry CONTRIBUTING.md guidelines for project-wide information, including code of conduct, and contributor license agreements, copyright notices, and how to engage with the OpenTelemetry community.

Our Development Process

Repository background

The OpenTelemetry Protocol with Apache Arrow project was initially developed in the github.com/f5/otel-arrow-adapter repository. At the time of the OpenTelemetry donation, this repository was a construction of original code and code copied from the OpenTelemetry Protocol with Apache Arrow Collector, which is a fork of the OpenTelemetry Collector, as part of our development process.

Source locations

This repository contains the OpenTelemetry Protocol with Apache Arrow definition and Golang libraries for producing and consuming streams of data in this format.

Exporter and receiver components for the OpenTelemetry Collector were developed in parallel and are currently maintained in this repository.

  • Exporter: Send telemetry data using OpenTelemetry Protocol with Apache Arrow
  • Receiver: Receive telemetry data using OpenTelemetry Protocol with Apache Arrow.

Historically, the exporter and receiver components were forked from the Collector's core OTLP Exporter and OTLP Receiver, and the original branch history is now archived in the OpenTelemetry Protocol with Apache Arrow Collector repository.

How to change the protobuf specification

To (re)generate the ArrowStreamService gRPC service, you need to install the protoc compiler and the protoc-gen-grpc plugin.

go install google.golang.org/protobuf/cmd/protoc-gen-go@v1.28
go install google.golang.org/grpc/cmd/protoc-gen-go-grpc@v1.2
export PATH="$PATH:$(go env GOPATH)/bin"
./proto/generate.sh

Once the *.pb.go files are generated, you need to replace the content of the api/collector/arrow/v1 directory by the generated files present in the ./proto/api/collector/arrow/v1 directory.

Releasing this repository

See the instructions in RELEASING.md.

Local development issues

This repository contains a top-level go.work file. This enables the Go modules defined here to avoid relative replace statements, which interfere with the ability to run them via simple go install and go run commands. The go.work file names all the module definitions inside this repository and allows them all to be used at once during local development.

Upgrading OpenTelemetry Collector dependencies

When a new version of the OpenTelemetry collector, is available, the easiest way to upgrade this repository is:

  1. Update the distribution::otelcol_version field in otelarrowcol-build.yaml
  2. Modify any components from the core or contrib repositories to use the corresponding versions (e.g., pprofextension's module version should match the new collector release).
  3. Regenerate otelarrowcol via make genotelarrowcol
  4. Run go work sync to update the other modules with fresh dependencies.