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https://issues.apache.org/jira/browse/NIFI-9507?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Handermann updated NIFI-9507:
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Status: Patch Available (was: In Progress)
> FetchSFTP spawns multiple keep-alive threads on failed connections
> ------------------------------------------------------------------
>
> Key: NIFI-9507
> URL: https://issues.apache.org/jira/browse/NIFI-9507
> Project: Apache NiFi
> Issue Type: Bug
> Components: Extensions
> Affects Versions: 1.15.1, 1.12.0
> Reporter: David Handermann
> Assignee: David Handermann
> Priority: Major
> Fix For: 1.16.0, 1.15.2
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> The {{FetchSFTP}} processor relies on the shared {{SFTPTransfer}} class to
> handle SFTP communication using the SSHJ library starting in NiFi 1.12.0.
> The {{SFTPTransfer}} class instantiates and configures an {{SSHClient}} based
> on processor properties, calling the {{connect}} method after initial
> configuration.
> The {{SSHClient.connect}} method can throw an {{IOException}} on failure to
> reach the remote SFTP server, but the NiFi {{SFTPTransfer}} class does not
> close in the {{{}SSHClient{}}}. Although {{FetchSFTP}} catches the
> {{IOException}} in the parent {{FetchFileTransfer.onTrigger}} method, the
> processor never closes the failed {{SSHClient}} because {{SFTPTransfer}}
> never assigned the instance variable.
> The creation and lifecycle of the {{SSHClient}} inside {{SFTPTransfer}}
> should be adjusted to ensure closure of {{SSHClient}} and the associated
> keep-alive thread.
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