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https://issues.apache.org/jira/browse/FLINK-4603?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15477093#comment-15477093
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Aljoscha Krettek commented on FLINK-4603:
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We wouldn't if we always keep everything in serialized form, as is the case for
the RocksDB backend. In that case, the user code is only necessary when a state
access comes in and when that happens we're already "in" the user code class
loader.
> 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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