[GitHub] jackjlli opened a new pull request #3864: Add controller mode logic in ControllerStarter

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jackjlli opened a new pull request #3864: Add controller mode logic in ControllerStarter
URL: https://github.com/apache/incubator-pinot/pull/3864
 
 
   This PR adds `controller mode` logic in ControllerStarter. By default, the controller would be in dual mode if nothing specified.
   
   If controller is in dual mode, it behaves the same as current controller.
   If controller is in helix_only mode, it just starts a helix controller without any pinot logic.
   If controller is in pinot_only mode, it just starts a pinot only controller without any helix logic.
   
   Unit tests added.
   
   This PR doesn't have the logic of handling partition leader yet, which will be added in the next PR. Thus, in this PR pinot only controller won't do any periodic tasks nor real-time segment completion.

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