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From "Goldstein Lyor (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SSHD-812) support asynchronous mode for sftp subsystem
Date Thu, 19 Apr 2018 18:17:00 GMT

    [ https://issues.apache.org/jira/browse/SSHD-812?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16444550#comment-16444550

Goldstein Lyor commented on SSHD-812:

[~gnt] great work - I am getting though quite frequent intermittent test failures when running
it via the Netty I/O factory. The strange thing is this. If I run {{mvn clean install}} only
on the _sshd-sftp_ artifact it is usually successful. However, if it runs as part of a general
{{mvn clean install}} it fails much more often - and always when run with the Netty I/O factory.
I cannot tell if this is because of the Netty factory or the async. mode. I am inclined to
believe some kind of race condition, but cannot put my finger on it yet - like I said, it
is intermittent, but if running {{mvn clean install -Ptest-netty}} on _sshf-sftp_ it seems
to fail most frequently.

> support asynchronous mode for sftp subsystem
> --------------------------------------------
>                 Key: SSHD-812
>                 URL: https://issues.apache.org/jira/browse/SSHD-812
>             Project: MINA SSHD
>          Issue Type: New Feature
>    Affects Versions: 1.7.0
>         Environment: java1.8, linux
>            Reporter: Zhenliang Su
>            Assignee: Guillaume Nodet
>            Priority: Minor
>              Labels: asynchronous, sftp
>             Fix For: 2.0.0
>         Attachments: Main.java, doRead.png
> I used SSHD as a middleman between client and target sftp server.
> I found that, when filezilla client directly connect to the target sftp server, it transfers
fast. When filezilla client connect to the middleman, it transfers slow.
> I analyzed the source code of org.apache.sshd.server.subsystem.sftp.SftpSubsystem#doRead,
and I found it behaves like block mode, and client's other SSH_FXP_READ request blocked
in the same thread.
> my middleman code:
>  [^Main.java]

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