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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-2968) Windowed fold operation fails because the initial value was not serialized
Date Wed, 04 Nov 2015 18:47:27 GMT

    [ https://issues.apache.org/jira/browse/FLINK-2968?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14990150#comment-14990150
] 

ASF GitHub Bot commented on FLINK-2968:
---------------------------------------

Github user asfgit closed the pull request at:

    https://github.com/apache/flink/pull/1328


> Windowed fold operation fails because the initial value was not serialized
> --------------------------------------------------------------------------
>
>                 Key: FLINK-2968
>                 URL: https://issues.apache.org/jira/browse/FLINK-2968
>             Project: Flink
>          Issue Type: Bug
>    Affects Versions: 0.10
>            Reporter: Till Rohrmann
>            Assignee: Till Rohrmann
>
> The windowed fold operation currently fails because the initial value was not serialized.
The reason for this is that the fold operation is realized as a {{WindowFunction}} within
an {{AbstractUdfStreamOperator}} and does not get the output type information forwarded (which
is necessary for the serialization). 
> The solution is to let the {{AbstractUdfStreamOperator}} forward the output type information
to the {{WindowFunction}} if it implements the {{OutputTypeConfigurable}} interface.



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