[jira] [Commented] (SSHD-812) support asynchronization mode for sftp subsystem

["Guillaume Nodet (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SSHD-812?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16429828#comment-16429828 ] 

Guillaume Nodet commented on SSHD-812:
--------------------------------------

I don't really see the benefit of having multiple threads reading the input stream.
It's more the {{process}} methods which should be called in an executor.
However, the original scenario can't be easily fixed with the current code, as a {{read}} operation uses a {{FileChannel}}, so in order to process multiple reads concurrently, the subsystem would have to use multiple channels for a single handle.

> support asynchronization 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: Goldstein Lyor
>            Priority: Minor
>              Labels: asynchronous, sftp
>         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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