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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