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https://issues.apache.org/jira/browse/FLINK-5221?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Syinchwun Leo updated FLINK-5221:
---------------------------------
    Description: 
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. 

  was:
When window OPERATOR making checkpoint like this:

class WindowStatistic  extends WindowFunction[Event, Int, Tuple, TineWindow] 
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. 


> 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: 1.1.3
>         Environment: SUSE
>            Reporter: Syinchwun Leo
>              Labels: windows
>   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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