[HBASE-22467] WebUI changes to enable Apache Knox UI proxying

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.0.0-alpha-1, 2.2.0, 2.3.0, 2.1.5
• Component/s: UI
• Labels: knox
• Hadoop Flags: Reviewed
• Assignee: Josh Elser
• Reporter: Josh Elser
• Created: 24/May/19 00:39
• Updated: 03/Jun/19 03:54
• Resolved: 28/May/19 20:34

Description

Apache Knox's gateway is nice in that it can provide centralized authentication and authorization for a collection of service. Additionally, it can expose "private" nodes through a single point (e.g. a gateway). This makes our life as developers much easier in cloud deployments where it's not straightforward to access nodes (e.g. they're running on some private network).

KNOX-1866 captures the changes over there required to make HBase's proxying actually work (definition lives there), but there were a few things we do in our UI which made it hard/impossible to proxy it correctly.

• ProfilerServlet was dropping extra query parameters in the URL
• JSON task output on master/regionserver couldn't be disambiguated
• Some missing /master-status and /rs-status links couldn't be disambiguated properly due to a lack of context
• Missing content-type set on a profiler servlet response

Issue Links

• is required by: KNOX-1866 Fix the HBase UI proxying
• relates to: HBASE-22511 More missing /rs-status links
• links to: GitHub Pull Request #261