[SSHD-812] support asynchronous mode for sftp subsystem

• Type: New Feature
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 1.7.0
• Fix Version/s: 2.0.0
• Labels: asynchronous sftp
• Environment: java1.8, linux
• Assignee: Guillaume Nodet
• Reporter: Zhenliang Su
• Created: 27/Mar/18 08:18
• Updated: 19/Dec/19 17:37
• Resolved: 19/Apr/18 15:09

Description

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

 

Issue Links

• blocks: SSHD-814 enrich the SftpEventListener
• links to: GitHub Pull Request #50