openjpa-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Albert Lee <allee8...@gmail.com>
Subject Re: Running more than 1 Entity Manager per JVM
Date Tue, 11 Mar 2014 13:49:34 GMT
"
*Also, is it possible to run 2 entity managers in the same runtime?  I
can't seem to find any documentation on doing so.*"

You can create more than one instance of em from emf and each one will have
its own persistence context.

Albert.


On Mon, Mar 10, 2014 at 10:27 PM, Todd Nine <todd@spidertracks.com> wrote:

> Hi guys,
>   I have a strange use case I can't get any help with in the user mailing
> list.  I'm hoping you guys can give me a hand.  I'm the author of this plug
> in.
>
> https://github.com/riptano/hector-jpa/
>
> This is not an XA data store, and doesn't participate in transactions.  I'm
> attempting to help a user with an online migration from this Cassandra
> plugin to MySQL.  Initially, I thought using slices would be the solution.
>  However, since the Hector JPA adapter is not a JDBC connector, this
> doesn't work.
>
> My next thought is to proxy changes that occur on commit (in the open jpa
> transaction, not the JDBC one) through to another Entity Manager that is
> connected only to MySQL.  This way, we get the dual write functionality we
> need for online migration, and we can perform background migration.
>
> Can you guys provide any examples on doing something like this?  I'm not
> sure where to start.
>
> Also, is it possible to run 2 entity managers in the same runtime?  I can't
> seem to find any documentation on doing so.
>
> Thanks,
> Todd
>



-- 
Albert Lee.

Mime
  • Unnamed multipart/alternative (inline, None, 0 bytes)
View raw message