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https://issues.apache.org/jira/browse/HELIX-681?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16451476#comment-16451476
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ASF GitHub Bot commented on HELIX-681:
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Github user asfgit closed the pull request at:
https://github.com/apache/helix/pull/197
> 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
> Priority: Major
>
> 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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