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https://issues.apache.org/jira/browse/FLINK-21642?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated FLINK-21642:
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Labels: pull-request-available (was: )
> RequestReplyFunction recovery fails with a remote SDK
> -----------------------------------------------------
>
> Key: FLINK-21642
> URL: https://issues.apache.org/jira/browse/FLINK-21642
> Project: Flink
> Issue Type: Bug
> Components: Stateful Functions
> Reporter: Igal Shilman
> Priority: Major
> Labels: pull-request-available
>
> While extending our smoke e2e test to use the remote SDKS I've stumbled upon
> a bug in the RequestReplyFunction. We get a unknown state exception after
> recovery.
> The exact scenario that trigger that bug is:
> # There was request in flight.
> # A failure occurs that causes the job to restart.
> # On restore, we start with no managed state
> # But we try to re-send to the SDK exactly the same ToFunction message.
> # That ToFunction contains state definitions from the previous attempt.
> (before the failure)
> # The SDK processes this message normally (it has all the state definitions
> that it knows)
> # The SDK responds with a state mutation.
> # The PersistedRemoteFunctionValues fails with unknown state.
>
> We need to treat the ToFunction messages as a retryBatch, instead of sending
> it as-is.
>
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