sudhi wrote:
>
> Hello,
> I have question :-)
> I am using apache1.3.12 and apacheJserv 1.1 and ApacheJSSI 1.1.2.
> I am interested in Session Fail over/migration. I looked into all of the
> document and mailing list. I wasn't able to find anything for failure
> and migration. The only thing i was able to find was in the document - "
> How to : Scalability - Load Balancing - Fault tolerance with Apache
> Jserv 1.1 ". In that document, in the fault tolerance section, it
> explains how session failure works (when one Jserv fails the request is
> sent to another Jserv, which creates a new session cookie (which will
> help to associate this request with this Jserv) and erases the old
> cookie. What I am really interested is
> " what happens to the session object ? "
As the session is stored in the memory space of the failed JServ session
then it is presumably lost if the java VM goes down. I guess it depends
upon precisely how the jserv instance fails. Anyhow, if the jserv
vanishes then the session will be gc'd even if it were still in the
memory of some vm.
> Is there a way to restore them, if so how to achieve this ?
> Is it possible to achieve session migration (from one jserv to another
> without loosing data) ?
Not without a lot of work, I'd have thought. Ideally you'd make the
jserv prescient and then it would know when it was about to fail and
send its session to another instance. Unfortunately, there are a couple
of implementation issues with this approach....
Cheers,
Tom
--
Using new ram-scoop infusion techniques, Undead Boars are twice as
undead as, say, Windows NT or IRIX. I find Undead Boars to be an
invaluable asset whether I'm hunting fierce animals or managing a
massive heterogeneous network.
--
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