Eron Wright created FLINK-5416:
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Summary: 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
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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