Github user StephanEwen commented on the issue:
    I think we are talking about two different things here:
      1. We DO need a new method on the hook interface to reinitialize the 
reader group. I think the one suggested by Eron works.
      2. We DO NOT need a new method on the CheckpointCoordinator, but calling 
`Hook.initializeState()` within `CC.restoreLatestCheckpointedState()` (whenever 
there is no checkpoint to be restored) should work.
    ==> Let's add the Hook method, but not add an additional method to the 


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