I wonder if someone could confirm what can be failed over in what products (although I
perceive that WLS seems to have some of the best facilities at present):
1) re-binding to Home (this should be easy and therefore I presume is available)
2) idempotent stateless session bean methods (again, from the below emails I presume
this is here today)
3) what about stateful session beans (i.e. memory replication or continual syncing
with a persistent representation) ?
4) entity beans - presuming that all instances are looking at the same database, does
any server offer this facility ?
We are going to use WLS but the reason I haven't posted to the WLS newsgroups is I
would like to hear views from WLS and other server users as to what is possible today.
Is anyone using application server clustering on a real system ?
Does it cause a performance degradation ?
Regards
Ed
-----Original Message-----
From: A mailing list for Enterprise JavaBeans development
[mailto:[EMAIL PROTECTED]]On Behalf Of Gene Chuang
Sent: Thursday, July 13, 2000 10:32 PM
To: [EMAIL PROTECTED]
Subject: Re: Resiliency: method level failover, who provides this
Not really... my stateless session beans' methods are NOT idempotent...
hence I cannot use weblogic's method failover support.
Gene
-----Original Message-----
From: A mailing list for Enterprise JavaBeans development
[mailto:[EMAIL PROTECTED]]On Behalf Of J. Matthew Pryor
Sent: Thursday, July 13, 2000 12:36 PM
To: [EMAIL PROTECTED]
Subject: Re: Resiliency: method level failover, who provides this
Doesn't Eric's post about idempotent methods contradict Gene's post about
having to wrapper re-binding to Homes etc
i.e.
> I don't know about WLE, but WLS has some EJB deployment options
> to indicate to
> the stub that it may automatically retry when a failure occurs:
>
> <home-is-clusterable>true</home-is-clusterable>
> <stateless-bean-is-clusterable>true</stateless-bean-is-clusterable>
> <stateless-bean-methods-are-idempotent>true</stateless-bean-method
> s-are-idempote
> nt>
>
[snip]
>
> Hope this helps.
>
> -Eric
Seems to contradict this
> Good call! WL 5.1 doesn't support this, and I had to hand-code a
> EJBHomeFactory that produced FailSafeHomes that wrapped EJBHome
> and provide
> transparent re-lookup in case of connection failure. This is
> definitely not
> a difficult concept and can easily be provided by the vendor, i.e.
> weblogic.ejbc generating FailSafeBeanImpl stubs...
>
> Maybe in WL 6.0???
>
> Gene
Just hoping to clarify either my foggy mind to 2 difering opinions
Thanks,
Matthew
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