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https://issues.apache.org/jira/browse/KAFKA-9277?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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huxihx reassigned KAFKA-9277:
-----------------------------
Assignee: huxihx (was: dengziming)
> move all group state transition rules into their states
> -------------------------------------------------------
>
> Key: KAFKA-9277
> URL: https://issues.apache.org/jira/browse/KAFKA-9277
> Project: Kafka
> Issue Type: Improvement
> Reporter: dengziming
> Assignee: huxihx
> Priority: Minor
> Fix For: 2.5.0
>
>
> Today the `GroupMetadata` maintain a validPreviousStates map of all
> GroupState:
> ```
> private val validPreviousStates: Map[GroupState, Set[GroupState]] =
> Map(Dead -> Set(Stable, PreparingRebalance, CompletingRebalance, Empty,
> Dead),
> CompletingRebalance -> Set(PreparingRebalance),
> Stable -> Set(CompletingRebalance),
> PreparingRebalance -> Set(Stable, CompletingRebalance, Empty),
> Empty -> Set(PreparingRebalance))
> ```
> It would be cleaner to move all state transition rules into their states :
> ```
> private[group] sealed trait GroupState {
> val validPreviousStates: Set[GroupState]
> }
> ```
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