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https://issues.apache.org/jira/browse/FLINK-1015?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14056684#comment-14056684
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Bastian Köcher commented on FLINK-1015:
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It's reducer with the id 9. We also do no grouping in front of this operator. 

> Wrong execution strategy
> ------------------------
>
>                 Key: FLINK-1015
>                 URL: https://issues.apache.org/jira/browse/FLINK-1015
>             Project: Flink
>          Issue Type: Bug
>            Reporter: Bastian Köcher
>         Attachments: impro3-ss14-stratosphere.zip
>
>
> We have a min reducer and it's taking really long. It's look like the reducer 
> is sorted in each iteration, but we don't need any sorting. We think that 
> this is the false execution plan. Here is the printed execution plan: 
> http://pastebin.com/cBXsBt6q



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