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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