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https://issues.apache.org/jira/browse/SSHD-1217?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17435231#comment-17435231
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Roberto Deandrea commented on SSHD-1217:
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Hi Thomas,
I tried the code changes in [https://github.com/apache/mina-sshd/pull/206] in
our lab environment.
The new code works smoothly without evident problems, but the performance of
the listing folder has not improved; it's almost the same as before, about 60
secs to list 2000 files.
I attached the full traces (at finest level) of the front-end Apache SSHD
server.
Can you take a look at attached traces (file
sftp-sshd-fe-listing-pr206.log.zip) ? Maybe you can find something interesting
in traces that I missed out...
I cannot exclude the possibility that the slow performance is due to other
causes (the front-end server and backend server are executed into docker images
in a bridged network)...
Thank you
Kind Regards
Roberto
> Slow performance listing huge number of files on Apache SSHD server
> -------------------------------------------------------------------
>
> Key: SSHD-1217
> URL: https://issues.apache.org/jira/browse/SSHD-1217
> Project: MINA SSHD
> Issue Type: Improvement
> Affects Versions: 2.6.0
> Reporter: Roberto Deandrea
> Assignee: Thomas Wolf
> Priority: Minor
> Attachments: sftp-sshd-fe-listing-pr206.log.zip,
> trace.ssh-frontend-sftplist.finest.log.zip
>
> Time Spent: 50m
> Remaining Estimate: 0h
>
> Hi Thomas,
> I noted slow performance listing files on the front-end Apache SSHD server in
> the same scenario as https://issues.apache.org/jira/browse/SSHD-1215
> The front-end Apache SSHD server is configured with a Filesystem built upon
> SFTPFileSystemProvider to proxy files to an Apache SSHD back-end server.
>
> In the /inbox folder of the Apache SSHD backend server I have 2000 files.
> The client sftp ls commands take 2 secs on the backend Apache SSHD server,
> instead it takes about 48 secs on the front-end Apache SSHD server.
> For greater number of files in the /inbox folder times are getting worse.
>
> I have full traces of sftp list commands to front-end Apache SSHD server
> that is attached to this jira.[^trace.frontend.sshd.log.zip]
> I looked through the traces on the front-end server and it seems to me that
> for every files in the folder the sftp client on the front-end server creates
> a SSH_MSG_CHANNEL_DATA generating tcp traffic that slow down the performance
> of the list command.
> Obviously this does not happen when a sftp client connects directly to the
> backend Apache SSHD server.
> Can you take a look at traces on the front-end Apache SSHD server ?
> Do you think it's possbile change something to improve performance of list
> files in this situation ?
>
> Thanks in advance
>
> Kind Regards
> Roberto
>
>
>
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