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Posted to issues@flink.apache.org by "Fabian Hueske (JIRA)" <ji...@apache.org> on 2016/11/23 09:27:59 UTC

[jira] [Assigned] (FLINK-5105) Improve ReduceState: value put into ReducingState should always be a copy

     [ https://issues.apache.org/jira/browse/FLINK-5105?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Fabian Hueske reassigned FLINK-5105:
------------------------------------

    Assignee: Fabian Hueske

> Improve ReduceState: value put into ReducingState should always be a copy
> -------------------------------------------------------------------------
>
>                 Key: FLINK-5105
>                 URL: https://issues.apache.org/jira/browse/FLINK-5105
>             Project: Flink
>          Issue Type: Bug
>          Components: State Backends, Checkpointing
>            Reporter: sunjincheng
>            Assignee: Fabian Hueske
>
>  In case of overlapping sliding windows, multiple references are hold on the same object. If we modify value1 or value2 the results are incorrect.  The value that is put into a ReducingState is always copied. That would allow to modify and emit one of the two input values (the one which is comes from the state).
> The FoldingState has the same problem.



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