[jira] [Created] (HELIX-821) CLONE - Allow partitions to be dropped automatically when their instance dies

["Clinton R.Holzheuser (Jira)" <ji...@apache.org>]

Clinton R.Holzheuser created HELIX-821:
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             Summary: CLONE - Allow partitions to be dropped automatically when their instance dies 
                 Key: HELIX-821
                 URL: https://issues.apache.org/jira/browse/HELIX-821
             Project: Apache Helix
          Issue Type: Improvement
          Components: helix-core
    Affects Versions: 0.6.0-incubating
            Reporter: Clinton R.Holzheuser
            Assignee: Shi Lu


Currently, when creating a session for a new participant, Helix resets current states of all assigned partitions from previous session of the same participant to the initial state. This may be undesirable for deployments where Helix session and assigned partitions by the participant are tightly coupled. In such a setup, when a participant loses a session, it also loses all associated partitions.  The current behavior triggers transitions back to the ideal state which may or may not be desirable.  Possible workarounds:
(1) update ideal state to DROPPED on noticing that an instance is not live anymore
(2) (suggested by Kishore) safely clear state from old participant session before creating a new session.  I'm using this one and so far it's working OK for me.



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