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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-5720) Deprecate "Folding" in all of DataStream API
Date Mon, 11 Sep 2017 03:41:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-5720?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16160619#comment-16160619
] 

ASF GitHub Bot commented on FLINK-5720:
---------------------------------------

Github user iduanyingjie commented on the issue:

    https://github.com/apache/flink/pull/3816
  
    In this document
    [https://ci.apache.org/projects/flink/flink-docs-release-1.4/dev/stream/operators/index.html#datastream-transformations](url)
    `keyedStream.fold("start")((str, i) => { str + "-" + i })`
    I want to do the same thing, what am I supposed to do and and don't use deprecated API


> Deprecate "Folding" in all of DataStream API
> --------------------------------------------
>
>                 Key: FLINK-5720
>                 URL: https://issues.apache.org/jira/browse/FLINK-5720
>             Project: Flink
>          Issue Type: Improvement
>          Components: DataStream API
>            Reporter: Aljoscha Krettek
>            Assignee: Chesnay Schepler
>            Priority: Blocker
>             Fix For: 1.3.0, 1.4.0
>
>
> Folding is an operation that cannot be done incrementally in a distributed way and that
also cannot be done on merging windows. Now that we have {{AggregatingState}} and aggregate
operations we should deprecate folding in the APIs and deprecate {{FoldingState}}.
> I suggest to remove folding completely in Flink 2.0



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