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https://issues.apache.org/jira/browse/SSHD-1217?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17434146#comment-17434146
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Roberto Deandrea commented on SSHD-1217:
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Hi Thomas,
I'm afraid for the messy with traces...
I attached new clean traces (trace.sshd-frontend-sftplist.log.zip) of Apache
SSHD front-end server related to a client sftp list of a folder containing 2000
files.
The list command on traces start at this line :
*[10/26/21 6:38:22:756 GMT]* 0000013a id=00000000
org.apache.sshd.sftp.server.AbstractSftpSubsystemHelper 1 process
process(ServerSessionImpl[part1@/172.31.0.1:41154])[length=15,
type=*SSH_FXP_OPENDIR*, id=2] processing
The list command on traces end at this line :
*[10/26/21 6:39:26:203 GMT]* 0000013a id=00000000
org.apache.sshd.sftp.server.AbstractSftpSubsystemHelper 1 sendStatus
doSendStatus(ServerSessionImpl[part1@/172.31.0.1:41154])[id=7] *SSH_FXP_STATUS
(substatus=SSH_FX_EOF, lang=, msg=Directory reading is done)*
It takes about 64 secs to list 2000 files on the remote folder of the Apache
SSHD backend server.
I hope the new traces can help to understand if something strange or wrong
happen on the front-end server.
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
> Priority: Minor
> Attachments: trace.sshd-frontend-sftplist.log.zip
>
>
> 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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