[THRIFT-3907] Skip Docker image build on CI when unchanged

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.10.0
• Assignee: Nobuaki Sukegawa
• Reporter: Nobuaki Sukegawa
• Created: 29/Aug/16 02:33
• Updated: 28/Sep/16 13:28
• Resolved: 04/Sep/16 12:27

Description

Previously we were able to reuse Docker layers from prebuilt images pulled from docker hub.
This has been reducing total build time by 3 hours out of 7~8 hours total.
After Docker 1.10 or so, it is no longer possible and we tend to easily saturate entire Apache's 30 jobs on Travis-CI.

Standard solution as of now is to use docker save/load.
This typically requires automated file upload on CI to some external storage.
Unfortunately it cannot be done with our current Travis-CI account settings.

To workaround this, we can put Dockerfile itself to Docker image and see if it's modified after the prebuild time and skip fresh builds if unchanged.

Issue Links

• links to: GitHub Pull Request #1070