Roberto Deandrea created SSHD-1217:
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Summary: 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
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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