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https://issues.apache.org/jira/browse/FLINK-2942?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14982730#comment-14982730
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Maximilian Michels commented on FLINK-2942:
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Thanks for for reporting this with attached screenshots!
> Dangling operators in web UI's program visualization (non-deterministic)
> ------------------------------------------------------------------------
>
> Key: FLINK-2942
> URL: https://issues.apache.org/jira/browse/FLINK-2942
> Project: Flink
> Issue Type: Bug
> Components: Webfrontend
> Affects Versions: 0.10
> Environment: OSX, Firefox and Chrome
> Reporter: Fabian Hueske
> Priority: Critical
> Fix For: 0.10, 1.0
>
> Attachments: Screen Shot 2015-10-29 at 17.11.19.png, Screen Shot
> 2015-10-29 at 20.51.46.png, Screen Shot 2015-10-29 at 20.52.13.png
>
>
> When visualizing a program with three {{MapPartition}} operators that branch
> off from an {{OuterJoin}} operator, two of the three {{MapPartition}}
> operators are not connected to the {{OuterJoin}} operator and appear to have
> no input.
> The problem is present in FireFox as well as in Chrome. I'll attach a
> screenshot.
> The problem and be reproduced by executing the "Cascading for the impatient"
> [TFIDF example
> program|https://github.com/Cascading/Impatient/tree/master/part5] using the
> [Cascading Flink Connector|https://github.com/dataArtisans/cascading-flink].
> Update: It appears that the problem is non-deterministic. I ran the same job
> again (same setup) and the previously missing connections were visualized.
> However, the UI showed only one input for a binary operator (OuterJoin).
> Running the job a third time resulted in a graph layout which was again
> different from both runs before. However, two of the {{MapPartition}}
> operators had not inputs just as in the first run.
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