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Struts & Hibernate
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| | | data replication | data replication 2004-07-12 - By koala.gnu@(protected)
Back
I have a server with a connected DB. I want use 2 or more servers with
same DB schema.
If a change occurs on a server (cache or DB) I want replicate this change.
I do not know if this is a Master/Master or
Master/Slave. The question is: does EJB do this job? If so, Should I delegate
this to DB. In this case I think that different implementation should occur
for each type of DB. Am I right?
As reported below. I have also problem in understand how to implement sequence
pattern for key generation in a clustered env and if it is possible execute
specific services on only one server in a cluster. For example, If I should
aggregate some data using a periodical thread I want to do this on only
one server and then replicate the result on others server.
Is this possible?
PS
I am using websphere.
-- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ------
-- ---- ---
Hi,
what kind of data replication are u talking about ?
is there two master databases with which your applications are going to
talk.
or a master or slave type of db architecture..
what EJB's or other mechanism can do is to refresh their references/cache
when some record is updated in db by an application running in other cluster.
so if you can provide more info, we might be able to help you.
Rajesh
At 12:11 12/07/2004, koala.gnu@(protected) wrote:
> Hi all,
>
> some questions.
>
> 1) Suppose I have a J2EE application with
>
> WEB Tier
> EJB Tier
> Database Tier
>
> I want to use clustering for solve scalability problem but I do not know
> who should be responsible for data replication: EJB or DB?
>
> I mean if on two server I configure EJB layers in clustering, does this
> allow data replication?
> If so, the entity bean should be defined remote or local. Currently I
use
> only local interface since session bean access to them on same JVM.
>
> 2) I use sequence bean pattern for id generation, but how to implement
it
> in a clustered environment. Any link?
>
> 3) again. I have some periodical tasks (call them services) and I want
execute
> them only on one server. It could be a good choice distribute service
> execution
> on server. What pattern I should use?
>
> Thanks.
>
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