[jira] [Created] (FLINK-4131) Confusing error for out dated RequestPartitionState

[Shang Yuanchun (Jira)]

Ufuk Celebi created FLINK-4131:
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             Summary: Confusing error for out dated RequestPartitionState
                 Key: FLINK-4131
                 URL: https://issues.apache.org/jira/browse/FLINK-4131
             Project: Flink
          Issue Type: Improvement
            Reporter: Ufuk Celebi
            Assignee: Ufuk Celebi


When a consumer requests a partition state for an old job or execution attempt (e.g. failed job or attempt), the JobManager answers with a {{null}} state, which fails the requesting task with the following cause: {{IllegalStateException("Received unexpected partition state null for partition request. This is a bug.")}}.

This is confusing to the user as one might think that this is the root failure cause.

I propose to either ignore the null state at the Task or not respond on the JobManager side if the job or execution attempt has been cleared (see {{RequestPartitionState}} in {{JobManager.scala}}).



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