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Posted to commits@helix.apache.org by "Hao Zhang (JIRA)" <ji...@apache.org> on 2018/03/20 01:57:00 UTC

[jira] [Created] (HELIX-682) Stale message should not prevent controller from rebalancing resource

Hao Zhang created HELIX-682:
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             Summary: Stale message should not prevent controller from rebalancing resource
                 Key: HELIX-682
                 URL: https://issues.apache.org/jira/browse/HELIX-682
             Project: Apache Helix
          Issue Type: Bug
            Reporter: Hao Zhang


Currently during MessageGenerationPhase, we skip re-balancing when there is pending message. Though we assume that participant will delete messages when they finish the task, there will be cases that when ZK is not stable and participant fail to do so, which will leave message un-deleted and thus block rebalance.

Ideally on controller side, we should try to delete message as well: if partition's current state is same as message's toState, or there is totally invalid message remaining, controller should try to delete message to unblock rebalancing



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