Syinchwun Leo created FLINK-5221:
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             Summary: 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


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. 



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