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https://issues.apache.org/jira/browse/FLINK-4883?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15662269#comment-15662269
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ASF GitHub Bot commented on FLINK-4883:
---------------------------------------
Github user StefanRRichter commented on a diff in the pull request:
https://github.com/apache/flink/pull/2729#discussion_r87724376
--- Diff: flink-java/src/main/java/org/apache/flink/api/java/DataSet.java
---
@@ -181,7 +181,17 @@ protected void fillInType(TypeInformation<T> typeInfo)
{
return this.type;
}
+ /**
+ * 1. Check if the function is implemented by a scala object. Checks
only if scala object function forbidden
+ * is not disabled in the
[[org.apache.flink.api.common.ExecutionConfig]]
+ *
+ * 2. Returns a "closure-cleaned" version of the given function.
Cleans only if closure cleaning
+ * is not disabled in the
[[org.apache.flink.api.common.ExecutionConfig]]
+ */
public <F> F clean(F f) {
--- End diff --
I think it would be helpful if you could share the error message.
> 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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