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https://issues.apache.org/jira/browse/NIFI-14720?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18004453#comment-18004453
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Michael W Moser commented on NIFI-14720:
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Looking forward to this, SSHJ has demonstrated throughput deficiencies.
> Switch to Apache MINA SSHD for SFTP Processors
> ----------------------------------------------
>
> Key: NIFI-14720
> URL: https://issues.apache.org/jira/browse/NIFI-14720
> Project: Apache NiFi
> Issue Type: Improvement
> Components: Extensions
> Reporter: David Handermann
> Assignee: David Handermann
> Priority: Major
>
> NiFi SFTP Processors have used the [SSHJ|https://github.com/hierynomus/sshj]
> library for the last several years, following a migration from JSch. Although
> SSHJ continues to receive regular maintenance, [Apache MINA
> SSHD|https://mina.apache.org/sshd-project/] also provides robust and
> extensible support for SSH and SFTP. NiFi has used MINA SSHD server
> components for unit testing over several years. Moving from SSHJ to MINA SSHD
> reduces the dependency maintenance surface for SFTP Processors while
> maintaining existing capabilities.
> The initial migration should retain existing Processor properties and
> implementation structure built in the internal {{SFTPTransfer}} class. Tests
> that mock particular SSHJ behavior should be removed or redesigned to make
> use of SFTP interaction with MINA SSHD server components where necessary.
> Some low-level features such as particular algorithm negotiation, or private
> key formats like PuTTY, may require manual migration. Support for legacy
> cipher or key negotiation algorithms may require deprecation. Further
> refinement of algorithm selection should be considered separately.
> Moving to MINA SSHD should provide a better foundation for considering future
> changes, such as key management and connection reuse through a separate
> Controller Service.
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