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https://issues.apache.org/jira/browse/FLINK-4603?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15483601#comment-15483601
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Till Rohrmann commented on FLINK-4603:
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That makes sense.
> KeyedStateBackend cannot restore user code classes
> --------------------------------------------------
>
> Key: FLINK-4603
> URL: https://issues.apache.org/jira/browse/FLINK-4603
> Project: Flink
> Issue Type: Bug
> Components: State Backends, Checkpointing
> Affects Versions: 1.2.0
> Reporter: Till Rohrmann
> Priority: Blocker
> Fix For: 1.2.0
>
>
> A user reported that he cannot restore keyed state which contains user code
> classes. I suspect that we don't use the user code class loader to
> deserialize the state.
> The solution seems to be to forward the user code class loader to the
> {{KeyedStateBackends}} when restoring state.
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