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https://issues.apache.org/jira/browse/FLINK-5416?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Stefan Richter reassigned FLINK-5416:
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Assignee: Stefan Richter
> Function wrappers should support CheckpointedFunction
> ------------------------------------------------------
>
> Key: FLINK-5416
> URL: https://issues.apache.org/jira/browse/FLINK-5416
> Project: Flink
> Issue Type: Bug
> Components: State Backends, Checkpointing
> Reporter: Eron Wright
> Assignee: Stefan Richter
>
> The `CheckpointedFunction` interface was introduced to provide user functions
> with a context for partitioned state storage. This works for user functions
> that are provided directly to the operator (assuming it extends from
> `AbstractUdfStreamOperator`). However, I see that some operators wrap the
> user function in an internal function (e.g. `WrappingFunction`,
> `InternalWindowFunction`). This defeats the callbacks on
> `CheckpointedFunction` because those wrappers don’t implement
> `CheckpointedFunction`.
> For example, the user function passed to `WindowedStream::apply` will get
> callbacks for `RichFunction` but not for `CheckpointedFunction`.
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