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https://issues.apache.org/jira/browse/FLINK-2178?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14584885#comment-14584885
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ASF GitHub Bot commented on FLINK-2178:
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Github user vasia commented on the pull request:
https://github.com/apache/flink/pull/799#issuecomment-111762942
Then shouldn't we throw an exception like we do in degrees with a "The edge
src/trg id is invalid" or something, instead of hiding the exception?
> groupReduceOnNeighbors throws NoSuchElementException
> ----------------------------------------------------
>
> Key: FLINK-2178
> URL: https://issues.apache.org/jira/browse/FLINK-2178
> Project: Flink
> Issue Type: Bug
> Components: Gelly
> Affects Versions: 0.9
> Reporter: Andra Lungu
> Assignee: Andra Lungu
>
> In the ALL EdgeDirection case, ApplyCoGroupFunctionOnAllNeighbors does not
> check whether the vertex iterator has elements causing the aforementioned
> exception.
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