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From Owen Nichols <onich...@pivotal.io>
Subject [DISCUSS] feedback on new experimental Cluster Management Service
Date Sat, 27 Jul 2019 01:54:16 GMT
Starting with discussions over a year ago, the Geode community recognized the need for a new
API for cluster management and cluster configuration management.  Currently this requires
a mix of properties, xml files, and gfsh commands.  The envisioned “v2” API would expose
identical REST and Java APIs and unify the configuration and management experience.

A vast amount of work remains to implement 100% of that vision, but the effort reached an
important milestone this week.  As of PR 3827 <https://github.com/apache/geode/pull/3827>,
the REST controllers for the handful of commands implemented so far <https://cwiki.apache.org/confluence/display/GEODE/Management+REST+API>
are now enabled by default.  The hope is to start gathering feedback on the v2 API vision
by making it easier for all users to try it.

Steps have been taken to make it clear that this API could change or be removed in a future
release:
- all public classes are annotated @Experimental <https://geode.apache.org/releases/latest/javadoc/org/apache/geode/annotations/Experimental.html>
- all REST endpoints <https://cwiki.apache.org/confluence/display/GEODE/Management+REST+API>
contain the word “experimental”
- all REST controllers can be disabled if needed by start locator --J=-Dgemfire.enable-management-rest-service=false

Recent discussion about the upcoming 1.10 release have some people wondering “Is there a
better way to get feedback on something new in Geode?”

Here are a few opinions I’ve heard:
- it’s fine the way it is (clearly labeled and has a kill switch just in case)
- this kind of work should be happening on a long-lived feature branch, not on develop. 
- Geode could have a separate “Technology Preview” release track (somehow merging all
feature branches).
- it’s open source; let's encourage all contributions and release often. 
- the community could vote that experimental features in Geode releases are ok if and only
if they are behind a feature flag which is off by default
- the community could encourage more frequent discussion of new and experimental features
so that concerns are raised and mitigated well in advance of the next planned release

This thread is open to discussion both on the new Cluster Management Service itself, as well
as the general process by which feedback on new features should be gathered.
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