Hao Zhang created HELIX-705:
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Summary: Participant duplicated state transition handling rework
Key: HELIX-705
URL: https://issues.apache.org/jira/browse/HELIX-705
Project: Apache Helix
Issue Type: Task
Reporter: Hao Zhang
Helix should have some re-work on participant side message handling:
- Duplicated message in same batch: discard the later one
- Duplicated message in different batches, the later one should be discarded if the first
one is in progress
- During state transition, we should not rely on current state delta to get partition's current
state, but should lock on state model def (thread safety)
- Duplicated state transition (toState == currentState) should not result in error, which
is confusion, but should report success
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