[jira] [Updated] (FLINK-864) Add description of mutable object iterators (GroupReduce, CoGroup) to documentation

["Ufuk Celebi (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-864?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ufuk Celebi updated FLINK-864:
------------------------------

    Component/s: Documentation

> Add description of mutable object iterators (GroupReduce, CoGroup) to documentation
> -----------------------------------------------------------------------------------
>
>                 Key: FLINK-864
>                 URL: https://issues.apache.org/jira/browse/FLINK-864
>             Project: Flink
>          Issue Type: Bug
>          Components: Documentation
>            Reporter: GitHub Import
>              Labels: github-import
>             Fix For: pre-apache
>
>
> Stratosphere uses value iterators with mutable objects.
> If this is not considered by an UDF, this silently leads to invalid results and hard to debug bugs.
> We had a lot of discussions about this. In the long run, we want to offer a safe default iterator which returns new objects with every call and a more efficient iterator with mutable object.
> Until then, we should add a warning to the Java Docs of `GroupReduceFunction` and `CoGroupFunction`.
> ---------------- Imported from GitHub ----------------
> Url: https://github.com/stratosphere/stratosphere/issues/864
> Created by: [fhueske|https://github.com/fhueske]
> Labels: documentation, user satisfaction, 
> Milestone: Release 0.5.1
> Created at: Mon May 26 10:33:28 CEST 2014
> State: open



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