Matt Gilman created NIFI-4386:
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             Summary: FetchSFTP - Ensure connection is closed
                 Key: NIFI-4386
                 URL: https://issues.apache.org/jira/browse/NIFI-4386
             Project: Apache NiFi
          Issue Type: Bug
          Components: Extensions
            Reporter: Matt Gilman
            Priority: Critical


If FetchSFTP fails due to permissions, it appears the connection is not being 
properly closed. The number of threads dedicated to SFTP sessions kept growing. 
The relevant part of the processor I believe is here [1]. We made need to 
investigate other failure scenarios as well.

[1] 
https://github.com/apache/nifi/blob/master/nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/main/java/org/apache/nifi/processors/standard/FetchFileTransfer.java#L256-L262




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