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https://issues.apache.org/jira/browse/FLINK-5111?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kostas Kloudas closed FLINK-5111.
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Resolution: Invalid
> Change the assignToKeyGroup() method to not use Object.hashCode()
> -----------------------------------------------------------------
>
> Key: FLINK-5111
> URL: https://issues.apache.org/jira/browse/FLINK-5111
> Project: Flink
> Issue Type: Bug
> Affects Versions: 1.2.0
> Reporter: Kostas Kloudas
> Priority: Blocker
> Fix For: 1.2.0
>
>
> Currently we use the Object.hashCode method as an intermediate step to assign
> an item to a key group. According to the java documentation:
> "This integer (returned by the method) need not remain consistent from one
> execution of an application to another execution of the same application."
> This means that a key may be assigned to another keygroup after restoring.
> This can easily break the semantics of a pipeline.
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