Hao Zhang created HELIX-681:
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Summary: Participant should not fail state transition on fail to
delete / relay message
Key: HELIX-681
URL: https://issues.apache.org/jira/browse/HELIX-681
Project: Apache Helix
Issue Type: Bug
Reporter: Hao Zhang
Currently we have a general try-catch block in HelixTask and HelixTaskExecutor,
which, upon any exception thrown from state transition routine, will fail state
transition. However there are at least the following cases in which state
transition should be considered as successful:
* When we fail to delete message after successfully handled message and
updated current state -> this is because we already completed state transition
and current state is consistent between participant and ZK
* When we fail to send out relay message > as relay message provides only best
effort of delivering messages, which has nothing to do with state transition's
results. In case of fail to relay message, controller will resend message which
ensures correctness.
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