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Posted to issues@flink.apache.org by "Eron Wright (JIRA)" <ji...@apache.org> on 2017/01/05 16:49:58 UTC
[jira] [Created] (FLINK-5416) Function wrappers should support
CheckpointedFunction
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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