[jira] [Created] (KNOX-2160) Process refreshable-service-parameters.xml in Knox

["Sandor Molnar (Jira)" <ji...@apache.org>]

Sandor Molnar created KNOX-2160:
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             Summary: Process refreshable-service-parameters.xml in Knox
                 Key: KNOX-2160
                 URL: https://issues.apache.org/jira/browse/KNOX-2160
             Project: Apache Knox
          Issue Type: New Feature
          Components: Server
    Affects Versions: 1.3.0, 1.2.0, 1.1.0
            Reporter: Sandor Molnar
            Assignee: Sandor Molnar
             Fix For: 1.4.0


It'd be beneficial if there was a way to update service parameters in a descriptor without using the Admin API/UI. The preferred approach is similar to {{gateway-reloadable.xml}} handling. I'd add 2 new configurations:
 - {{refreshable.service.parameters.folder}} - optional configuration to indicate if Knox should monitor the given folder for service parameter changes. If it's {{null}} -> no monitoring is enabled.
 - {{refreshable.service.parameters.folder.monitor.interval}} - indicates the time period Knox checks if any parameter changes were made; defaults to 60 seconds. This is relevant only if {{refreshable.service.parameters.folder}} is {{not null}}.

A new monitor would be implemented (triggered only if monitoring is enabled) as follows:
 # checks {{refreshable-service-parameters.xml}} within the configured {{refreshable.service.parameters.folder}}. The relevant configuration's name is {{refreshable.service.parameters}}.
 # if there is new content (based on file timestamp) -> parse the file and build a new parameter list -> trigger topology redeployment with the new parameter list by rewriting the appropriate descriptor file.



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