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https://issues.apache.org/jira/browse/NIFI-6017?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16766237#comment-16766237
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Joseph Witt commented on NIFI-6017:
-----------------------------------

thanks for reporting.  this looks important to address for the very shortly RC 
ready 1.9.0.  [~markap14] can you take a look?

> ArrayIndexOutOfBounds Load Balancer CorrelationAttributePartitioner
> -------------------------------------------------------------------
>
>                 Key: NIFI-6017
>                 URL: https://issues.apache.org/jira/browse/NIFI-6017
>             Project: Apache NiFi
>          Issue Type: Bug
>          Components: Core Framework
>    Affects Versions: 1.8.0
>            Reporter: Dorian Bugeja
>            Assignee: Mark Payne
>            Priority: Critical
>             Fix For: 1.9.0
>
>
> When trying to perform load balancing on queue using 'partition by 
> attribute', the use of the hashCode() function can return a negative value 
> which in turns, the '%' operation might return a negative value (which is 
> used as index) which throws an ArrayIndexOutOfBounds exception. 



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