Gene,
I looked at this article. I believe the author did not get access
to iPlanet and Websphere application servers and could not review
them for that article.
I have some experience with iPlanet Application Server and this is what
I know. In this implementation, the Bean state is serialized to an
in-memory session store at "interesting" points a) across transactions
and b) at configurable timer intervals. You could control the interval
so that timer based saving does not happen, if you have strict
transactional data and state synchronization requirements.
The bean handle must be preserved (in HttpSession, which is expected
to survive a server crash, if you use their highly available sessions)
and smart stubs will reconstitute the stateful session bean if they
detect that the remote object is not responding.
The bean serialization is not without a small overhead. But I dont have any
data.
A sample application is described at:
http://developer.iplanet.com/appserver/samples/cluster/docs/index.html
Sreeram Duvvuru
>MIME-Version: 1.0
>Date: Mon, 14 May 2001 13:30:41 -0700
>From: Gene Chuang <[EMAIL PROTECTED]>
>Subject: Re: True failover for stateful session beans?
>To: [EMAIL PROTECTED]
>
>There isn't a "right" vendor... Well, not until I get on someone's payroll!
>:-) You will need to do some research to see which implementation is best
>for your palnned architecture. Here's a good start:
>
>http://www.javaworld.com/javaworld/jw-02-2001/jw-0223-extremescale.html
>
>Gene
>
>-----Original Message-----
>From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Rupa Schomaker
>Sent: Monday, May 14, 2001 1:23 PM
>To: Gene Chuang
>Cc: [EMAIL PROTECTED]
>Subject: Re: True failover for stateful session beans?
>
>
>Gene Chuang <[EMAIL PROTECTED]> writes:
>
>> Stateful session failover implementation is vendor-specific, but if you
>pick
>> the right vendor, you will not have to worry about any of the questions
>you
>> just asked. Not only can you store the session bean's Handle in a
>> replicated HttpSession, but you can also some vendors provide failover
>> Stateful Session beans altogether.
>>
>> Gene
>
>which is the right vendor?
>
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