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https://issues.apache.org/jira/browse/FLINK-5221?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15724281#comment-15724281
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Aljoscha Krettek commented on FLINK-5221:
-----------------------------------------
FLINK-5250 would be the general fix for this.
> Checkpointed workless in Window Operator
> ----------------------------------------
>
> Key: FLINK-5221
> URL: https://issues.apache.org/jira/browse/FLINK-5221
> Project: Flink
> Issue Type: Bug
> Components: DataStream API
> Affects Versions: 1.2.0, 1.1.3
> Environment: SUSE
> Reporter: Syinchwun Leo
> Labels: windows
> Fix For: 1.2.0
>
> Original Estimate: 12h
> Remaining Estimate: 12h
>
> When window OPERATOR making checkpoint like this:
> class WindowStatistic extends WindowFunction[Event, Int, Tuple, TimeWindow]
> with Checkpointed[Option[List[Event]]] {
> override def appley()....
> override def snapshotState()...
> override def restoreState()
> }
> Window Operator couldn't invoke user defined function "snapshotState()". In
> debug model, line 123 in AbstractUdfStreamOperator.java returns false and
> can't make user defined state when checking the window whether is a
> Checkpointed instance. I think there is something wrong in userFunction var,
> it's a ScalaWindowFunctionWrapper object and it couldn't reflect if the user
> defined window extend Checkpointed Interface. Actually, the user defined
> window is kept in "func" var of userFunction.
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