Prepare to integrate new scheduler into apache/openwhisk-deploy-kube

[hunhoffe]

Description

I am working on integrating the new scheduler into openwhisk-deploy-kube (see this draft PR here). While most of the changes that need to be made are within the apache/openwhisk-deploy-kube repo, some changes need to be made here for full support.

Namely:

• Scheduler images need to be build and pushed to dockerhub
• The scheduler and controller both need to option to use the akka cluster discovery in the case that they are replicated; the existing mechanism of using seedNodes is not a great fit for Kubernetes deployments

I tested locally (mostly using Kubernetes deployments) but I'm not sure the best way to test the tooling and changes to travis/CI.

Note that while I did, in general, try to integrate the scheduler into the tooling, I did not attempt to add it to dev/src/main/groovy/intellijRunConfig.groovy, as I don't have experience in this area.

My changes affect the following components

• API
• Controller
• Message Bus (e.g., Kafka)
• Loadbalancer
• Scheduler
• Invoker
• Intrinsic actions (e.g., sequences, conductors)
• Data stores (e.g., CouchDB)
• Tests
• Deployment
• CLI
• General tooling
• Documentation

Types of changes

• Bug fix (generally a non-breaking change which closes an issue).
• Enhancement or new feature (adds new functionality).
• Breaking change (a bug fix or enhancement which changes existing behavior).

Checklist:

• I signed an Apache CLA.
• I reviewed the style guides and followed the recommendations (Travis CI will check :).
• I added tests to cover my changes.
• My changes require further changes to the documentation.
• I updated the documentation where necessary.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 40.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 76.42%. Comparing base (138f3d9) to head (806cbe7).
Report is 90 commits behind head on master.

Files with missing lines	Patch %	Lines
...rg/apache/openwhisk/core/scheduler/Scheduler.scala	25.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5278      +/-   ##
==========================================
- Coverage   81.03%   76.42%   -4.61%     
==========================================
  Files         239      239              
  Lines       14245    14249       +4     
  Branches      594      602       +8     
==========================================
- Hits        11543    10890     -653     
- Misses       2702     3359     +657     

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[hunhoffe]

Apologies for making the PR live - then draft - then live again, but I believe it is in a good state now and ready for review!

[dgrove-oss]

Hi Erika, have you filed an Individual Contributors License Agreement with Apache (https://www.apache.org/licenses/contributor-agreements.html#clas)? I did a quick search and I don't think I found one for you, but the tooling isn't always perfect.

If you haven't done so already please go ahead and do that.

[hunhoffe]

@dgrove-oss I did submit an ICLA in the past, so I should be good to go. To be on the safe side and check for clerical errors, I have sent an email asking for confirmation that my form is on file.

[dgrove-oss]

ok, cool. That's fine then. The tool for looking up ICLAs changed recently. Now you have to search by email address instead of by name and I haven't figured out how to do fuzzy searches yet.

[hunhoffe]

Rebased to master so I can make sure new changes integrate well into openwhisk-deploy-kube, also - I did confirm my ICLA is good.

[style95]

I generally agree with the direction of this PR.
I just wanted to make sure only the required logic is added.

[hunhoffe]

Rebased to master, finished addressing comments about changes to controller (by removing changes to the controller)

[style95]

Thank you, Erika, for your effort. 👍