Github user steveloughran commented on the pull request:
https://github.com/apache/spark/pull/9238#issuecomment-151462264
1. Adding new abstract methods is going to break providers which use the
current plugin point. Adding base implementations which throw an "unsupported"
exception would be better.
2. If there was also a `hasFeature` method to enumerate/probe for features,
the UI could adapt and skip showing UI features which aren't implemented
3. You can bring up a history server in the test suite. This will let you
test that the actual POST operation works, If you look at the [SPARK-1537
publisher tests](https://github.com/apache/spark/pull/5423) you can see me
doing this for the GET side of things.
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