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https://issues.apache.org/jira/browse/FLINK-4883?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15619663#comment-15619663
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Renkai Ge commented on FLINK-4883:
----------------------------------
I tried to implement it in module flink-scala and flink-streaming-scala, but it
seems that these two modules assumes flink-java and flink-streaming-java do a
lot of work and flink-scala and flink-stream-scala is just a wrap. I think I
have to change the code in flink-java and flink-stream-java, and write tests in
flink-scala and flink-stream-scala or too much code would be changed.
> 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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