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From "Aljoscha Krettek (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-4016) FoldApplyWindowFunction is not properly initialized
Date Tue, 07 Jun 2016 11:31:21 GMT

    [ https://issues.apache.org/jira/browse/FLINK-4016?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15318320#comment-15318320
] 

Aljoscha Krettek commented on FLINK-4016:
-----------------------------------------

I don't think so, FLINK-3977 describes a more general problem of which this (FLINK-4016) is
a manifestation.

> FoldApplyWindowFunction is not properly initialized
> ---------------------------------------------------
>
>                 Key: FLINK-4016
>                 URL: https://issues.apache.org/jira/browse/FLINK-4016
>             Project: Flink
>          Issue Type: Bug
>          Components: DataStream API
>    Affects Versions: 1.0.3
>            Reporter: RWenden
>            Priority: Blocker
>              Labels: easyfix
>             Fix For: 1.1.0
>
>   Original Estimate: 1h
>  Remaining Estimate: 1h
>
> FoldApplyWindowFunction's outputtype is not set.
> We're using constructions like (excerpt):
>       .keyBy(0)
>       .countWindow(10, 5)
>       .fold(...)
> Running this stream gives an runtime exception in FoldApplyWindowFunction:
> "No initial value was serialized for the fold window function. Probably the setOutputType
method was not called."
> This can be easily fixed in WindowedStream.java by (around line# 449):
>             FoldApplyWindowFunction foldApplyWindowFunction = new FoldApplyWindowFunction<>(initialValue,
foldFunction, function);
>             foldApplyWindowFunction.setOutputType(resultType, input.getExecutionConfig());
>             operator = new EvictingWindowOperator<>(windowAssigner,
>                     windowAssigner.getWindowSerializer(getExecutionEnvironment().getConfig()),
>                     keySel,
>                     input.getKeyType().createSerializer(getExecutionEnvironment().getConfig()),
>                     stateDesc,
>                     new InternalIterableWindowFunction<>(foldApplyWindowFunction),
>                     trigger,
>                     evictor);



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