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https://issues.apache.org/jira/browse/FLINK-5883?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15928726#comment-15928726
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ASF GitHub Bot commented on FLINK-5883:
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Github user greghogan commented on the issue:
https://github.com/apache/flink/pull/3392
This change also effects running in a cluster environment where the UDF
requests multiple iterators but accepts that the same iterator is returned, as
in the modified test.
Since this only affects the batch API, since 2.0 may be a ways off, and
since the changed behavior throws an exception I'm in favor of making the
change in 1.3.
> Re-adding the Exception-thrown code for ListKeyGroupedIterator when the
> iterator is requested the second time
> -------------------------------------------------------------------------------------------------------------
>
> Key: FLINK-5883
> URL: https://issues.apache.org/jira/browse/FLINK-5883
> Project: Flink
> Issue Type: Improvement
> Components: DataSet API
> Reporter: lincoln.lee
> Assignee: lincoln.lee
>
> Originally, ListKeyGroupedIterator ensured that a TraversableOnceException
> was thrown when the iterator is requested the second time within FLINK-1023,
> it was lost from FLINK-1110 unexpectedly, so add it back.
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