Travis CI arm64 support

[jishminor]

Requirement - what kind of business use case are you trying to solve?

Run and test all Jaeger components on arm64.

Problem - what in Jaeger blocks you from solving the requirement?

No existing infrastructure to build and test Jaeger components on arm64.

Proposal - what do you suggest to solve the problem or improve the existing situation?

Travis CI can now run multiarch builds out of the box: https://docs.travis-ci.com/user/multi-cpu-architectures/.

Any open questions to address

Would there be any interest in modifying the CI configuration to support arm64 builds?

[yurishkuro]

I'd be concerned with how much extra load it would add to our CI jobs, which already take quite a while to run for each PR.

[jpkrohling]

I think we could consider adding it at least for the unit tests. I think it would cover most of the arch-related issues that we might face.

[jishminor]

Pushing the arm64 docker images to dockerhub would also be a great addition. Especially with the announcement of bigger and better AWS arm64 ec2 instances: https://aws.amazon.com/blogs/aws/coming-soon-graviton2-powered-general-purpose-compute-optimized-memory-optimized-ec2-instances/.

[jpkrohling]

@jishminor are you able to commit to support this when it needs maintenance? If so, send a PR with your proposal and let's see how the CI gets affected.

[jishminor]

I have only so far been using an arm64 jaeger agent, which speaks to a x86 jaeger collector. I still need to fully familiarize myself with your build and test infrastructure before I can give my commitment for maintenance support for arm64. Let me do some experimenting and get back to you. I don't for-see many things breaking when swapping out the x86 go runtime for the arm64, besides any OS level package use (syscall interfaces etc).

[jpkrohling]

Let us know if you hit any roadblocks!

[vielmetti]

@jishminor have you had any success here? If you need arm64 infrastructure to test or develop, reach out to the @WorksOnArm project via opening an issue at https://github.com/worksonarm/cluster/issues .

[jishminor]

@vielmetti I have not yet. I have my own repository for the Jaeger Agent on arm64 and arm, but have not gotten around to playing with the build infrastructure in this repo.

[yurishkuro]

ARM64 binaries are already supported (#1656) as part of the release (but not the Docker images).

We don't have the CI resources to do integration testing on all supported platforms. I am closing this.