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Posted to issues@flink.apache.org by "Stefan Richter (JIRA)" <ji...@apache.org> on 2016/10/24 09:38:58 UTC

[jira] [Updated] (FLINK-4883) Prevent UDFs implementations through Scala singleton objects

     [ https://issues.apache.org/jira/browse/FLINK-4883?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Stefan Richter updated FLINK-4883:
----------------------------------
    Assignee: Renkai Ge

> Prevent UDFs implementations through Scala singleton objects
> ------------------------------------------------------------
>
>                 Key: FLINK-4883
>                 URL: https://issues.apache.org/jira/browse/FLINK-4883
>             Project: Flink
>          Issue Type: Bug
>            Reporter: Stefan Richter
>            Assignee: Renkai Ge
>
> Currently, user can create and use UDFs in Scala like this:
> {code}
> object FlatMapper extends RichCoFlatMapFunction[Long, String, (Long, String)] {
> ...
> }
> {code}
> However, this leads to problems as the UDF is now a singleton that Flink could use across several operator instances, which leads to job failures. We should detect and prevent the usage of singleton UDFs.



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