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From StephanEwen <...@git.apache.org>
Subject [GitHub] flink issue #3599: [FLINK-6174][HA]introduce a new election service to make ...
Date Thu, 23 Mar 2017 14:23:14 GMT
Github user StephanEwen commented on the issue:

    https://github.com/apache/flink/pull/3599
  
    -1 sorry.
    
    This needs to go to the drawing board (FLIP or detailed JIRA discussion) before we consider
a change that is impacting the guarantees and failure mode so heavily.
    
    Some initial comments:
    
      - In proper HA, you need some service that "locks" the leader, otherwise you are vulnerable
to the "split brain" problem where a network partition makes multiple JobManagers work as
leaders, each with some TaskManagers.
    
      - In FLIP-6, we are introducing the `HighAvailabilityServices` to allow for multiple
levels of guarantees with different implementations. I can see that introducing a highly-available
but not split-brain-protected is interesting, but it should not replace any existing mode,
but be a new mode.



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