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Posted to issues@flink.apache.org by "Eron Wright (JIRA)" <ji...@apache.org> on 2017/01/15 01:22:26 UTC
[jira] [Closed] (FLINK-5416) Function wrappers should support
CheckpointedFunction
[ https://issues.apache.org/jira/browse/FLINK-5416?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Eron Wright closed FLINK-5416.
-------------------------------
Resolution: Duplicate
Seems to a duplicate of FLINK-5250, and the fix there looks good.
> 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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