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Posted to dev@mina.apache.org by "Thomas Wolf (Jira)" <ji...@apache.org> on 2021/10/16 20:08:00 UTC
[jira] [Commented] (SSHD-1217) Slow performance listing huge number
of files on Apache SSHD server
[ https://issues.apache.org/jira/browse/SSHD-1217?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17429610#comment-17429610 ]
Thomas Wolf commented on SSHD-1217:
-----------------------------------
I see the server sending the directory listing in chunks of about 150 files (about 16kB of data). Could it be a configuration issue? Check the values of the Apache MINA sshd configuration MAX_READDIR_DATA_SIZE on your front-end server and on your back-end server. It's 16kB by default.
> 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.frontend.sshd.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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