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https://issues.apache.org/jira/browse/FLINK-5932?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15891930#comment-15891930
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Stefan Richter commented on FLINK-5932:
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I think it makes a lot of sense if it is easily possible.
> Order of legacy vs new state initialization in the AbstractStreamOperator.
> --------------------------------------------------------------------------
>
> Key: FLINK-5932
> URL: https://issues.apache.org/jira/browse/FLINK-5932
> Project: Flink
> Issue Type: Bug
> Components: DataStream API
> Affects Versions: 1.2.0
> Reporter: Kostas Kloudas
> Assignee: Kostas Kloudas
> Fix For: 1.3.0
>
>
> Currently in the
> {{AbstractStreamOperator::initializeState(OperatorStateHandles
> stateHandles)}}, the {{restoreStreamCheckpointed}} which is responsible for
> restoring state from previous Flink versions, (backwards compatibility) is
> called before the {{initializeState(StateInitializationContext context)}}
> which is responsible for initializing the state in Flink 1.2.
> This has the negative side effect that when implementing the backwards
> compatibility strategy for a given operator, we have to restore the old
> state, store it in local variables, and register it with the new state
> abstractions in the {{initializeState()}} or the {{open()}}. This creates a
> lot of unnecessary code in the operators, and potential memory leaks if the
> local variables are not "null-ified".
> This issue proposes to call the {{restoreStreamCheckpointed}} after the
> {{initializeState(StateInitializationContext context)}}. This way, the new
> operator state will have been initialized (e.g. keyed state), and the
> {{restoreStreamCheckpointed}} will be able to register its state directly
> with the new abstractions, instead of putting it in local variables and wait
> for the {{initializeState}} or the {{open()}} to re-register it.
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