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https://issues.apache.org/jira/browse/NIFI-9328?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17433817#comment-17433817
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David Handermann commented on NIFI-9328:
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Changes to handle asynchronous session commit processing in NIFI-8469 resulted
in failure to call the cleanup transfer method in {{FetchFileTransfer}}, which
impacts both {{FetchSFTP}} and {{FetchFTP}}.
> FetchSFTP fails to close connections while file.not.found error
> ----------------------------------------------------------------
>
> Key: NIFI-9328
> URL: https://issues.apache.org/jira/browse/NIFI-9328
> Project: Apache NiFi
> Issue Type: Bug
> Affects Versions: 1.14.0
> Reporter: Deep Ghodasara
> Assignee: Lehel Boér
> Priority: Critical
>
> If *FetchSFTP* fails due to *file.not.found* exception, it appears the
> connection is not being properly closed. The number of threads dedicated to
> SFTP sessions kept growing.
> This leads to out of memory exception and eventually causing Nifi to
> shutdown. Hence this is critical to investigate and find resolution.
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