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https://issues.apache.org/jira/browse/NIFI-14152?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18004998#comment-18004998
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Eric Secules commented on NIFI-14152:
-------------------------------------

Hi Mark, could you add what processor you were testing to the ticket 
description and how you observed the multiple access?

> Mock Framework does not lock Input Queues when using 
> ProcessSession.get(FlowFileFilter)
> ---------------------------------------------------------------------------------------
>
>                 Key: NIFI-14152
>                 URL: https://issues.apache.org/jira/browse/NIFI-14152
>             Project: Apache NiFi
>          Issue Type: Bug
>          Components: Core Framework
>            Reporter: Mark Payne
>            Priority: Major
>
> When {{PocessSession.get(FlowFileFilter)}} is called, the thread running the 
> filter should have exclusive access to the FlowFiles in all incoming queues. 
> The NiFi framework ensure that this happens. However, the Mock Framework does 
> not ensure this. As a result, if it is scheduled to run with multiple 
> concurrent threads, this can result in multiple threads accessing the 
> FlowFiles in the queue concurrently.



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