Re: [JSch-users] Concurrency with JSch

[Lahiru G. <gl...@gm...>]

Hi guillaume,

I was able tohandle it in my code level by synchronizing the code.
Everything works fine, I share sessions but synchronized the methods.

Lahiru

On Mon, Nov 17, 2014 at 11:22 AM, guillaume cornet <
cor...@gm...> wrote:

> Hi Lahiru !
>
>
> I'm creating many SftpChannel in multiple Session and I'm facing the same
> issue (e.g. 'Packet corrupt' or 'connection is closed by foreign host').
>
> In order to solve this issue, I've introduce an retry mechanism in my
> code, so that a new Session is created an openend when such error are
> detected.
>
> I know it is not the best solution, but it was easier to do this rather
> than modifying JCraft source code to make it thread safe.
>
>
> Does anybody encounter such concurrency issue ?
>
>
>
> G.
>
> 2014-10-07 20:34 GMT+02:00 Lahiru Gunathilake <gl...@gm...>:
>
>> Hi Users,
>>
>> And when I remove the threadpool an still submit a very large load I can
>> see I am getting the following error intermittently,
>>
>> com.jcraft.jsch.JSchException: Packet corrupt
>>
>>
>>         at com.jcraft.jsch.Session.start_discard(Session.java:1049)
>>
>>         at com.jcraft.jsch.Session.read(Session.java:956)
>>
>>         at com.jcraft.jsch.UserAuthNone.start(UserAuthNone.java:56)
>>
>>         at com.jcraft.jsch.Session.connect(Session.java:389)
>>
>>         at com.jcraft.jsch.Session.connect(Session.java:183)
>>
>>
>> Regards
>>
>> Lahiru
>>
>> On Tue, Oct 7, 2014 at 2:18 PM, Lahiru Gunathilake <gl...@gm...>
>> wrote:
>>
>>> Hi All,
>>>
>>> I have extended the JCraft library to authenticate my servers with a
>>> token and everything works fine when I use in the serial mode. But when I
>>> moved to a thread pool and try to share the JCraftSession and try to create
>>> multiple channels in large number of threads (I have already increased my
>>> maxSessionCount in sshd_config) I get the following error and I am not sure
>>> what is really going on.
>>>
>>> Every 20-30 request I get the below error.
>>>
>>>
>>>  "com.jcraft.jsch.JSchException: channel is not opened."
>>>
>>>
>>> Anybody using the sessions and creating channels concurrently ? I am not
>>> synchronizing the session in each thread ? Should I synchronize the session
>>> object if I am using in multi-threaded mode ?
>>>
>>> Regards
>>> Lahiru
>>>
>>> --
>>> Research Assistant
>>> Science Gateways Group
>>> Indiana University
>>>
>>
>>
>>
>> --
>> Research Assistant
>> Science Gateways Group
>> Indiana University
>>
>>
>> ------------------------------------------------------------------------------
>> Meet PCI DSS 3.0 Compliance Requirements with EventLog Analyzer
>> Achieve PCI DSS 3.0 Compliant Status with Out-of-the-box PCI DSS Reports
>> Are you Audit-Ready for PCI DSS 3.0 Compliance? Download White paper
>> Comply to PCI DSS 3.0 Requirement 10 and 11.5 with EventLog Analyzer
>>
>> http://pubads.g.doubleclick.net/gampad/clk?id=154622311&iu=/4140/ostg.clktrk
>> _______________________________________________
>> JSch-users mailing list
>> JSc...@li...
>> https://lists.sourceforge.net/lists/listinfo/jsch-users
>>
>>
>


-- 
Research Assistant
Science Gateways Group
Indiana University