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https://issues.apache.org/jira/browse/FLINK-27608?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17536840#comment-17536840
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Zhilong Hong commented on FLINK-27608:
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As a {{PartitionNotFoundException}} is thrown, it will be handled in by the
logic located at
{{{}org.apache.flink.runtime.io.network.netty.CreditBasedPartitionRequestClientHandler:298{}}}.
The {{Task}} will try to {{requestPartitionProducerState}} from the
JobManager. If the upstream task is not ready (i.e. in the DEPLOYING or
INITIALIZING state), the {{SingleInputGate}} will try to retrigger another
partition request until the partition is consumable.
> Flink may throw PartitionNotFound Exception if the downstream task reached
> Running state earlier than it's upstream task
> ------------------------------------------------------------------------------------------------------------------------
>
> Key: FLINK-27608
> URL: https://issues.apache.org/jira/browse/FLINK-27608
> Project: Flink
> Issue Type: Bug
> Components: Runtime / Network
> Affects Versions: 1.14.2
> Reporter: zlzhang0122
> Priority: Major
> Fix For: 1.16.0
>
>
> Flink streaming job deployment may throw PartitionNotFound Exception if the
> downstream task reached Running state earlier than its upstream task and
> after maximum backoff for partition requests passed.But the config of
> taskmanager.network.request-backoff.max is not eay to decide. Can we use a
> loop awaiting the upstream task partition be ready?
>
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