Mark Payne created NIFI-14197:
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             Summary: If Exception thrown from FlowFileFilter, FlowFiles become 
inaccessible until restart
                 Key: NIFI-14197
                 URL: https://issues.apache.org/jira/browse/NIFI-14197
             Project: Apache NiFi
          Issue Type: Bug
          Components: Core Framework
            Reporter: Mark Payne
            Assignee: Mark Payne


If a Processor provides a {{FlowFileFilter}} to the 
{{ProcessSession.get(FlowFileFilter)}} method, and the {{FlowFileFilter}} 
throws an exception, the FlowFile that the filter is evaluating, and all other 
FlowFiles that it has evaluated, become inaccessible. The queue still shows the 
data available but the Processor can't get to the FlowFiles. Upon restart of 
NiFi, the FlowFiles are properly restored and accessible.



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