Good point. They belong to the same entity group. The more complete
Objectify class is shown.
public class Payment implements IsSerializable {
@Id
private Long id;
@Parent Key<Party> parentPartyKey;
private String comments;
private double amount;
}
public class Invoice IsSerializable {
@Id Long id;
@Parent Key<Party> parentPartyKey;
InvoiceType invoiceType;
Status status;
private double amount;
}
In the application,there are situations, where I update the Payment and
Invoice in a transaction.
So, how can this be done in mapreduce.
-Aswath
On Sat, Oct 30, 2010 at 12:26 PM, Didier Durand <[email protected]>wrote:
> Hi,
>
> Question from side: do Payment & Invoice belong to the same entity
> group as Party ? I ask this because of the transactional implications
> it will have when you modify keys in Payments & Invoices.
>
> regards
> didier
>
> On Oct 30, 5:04 am, aswath satrasala <[email protected]>
> wrote:
> > Hi,
> > Further, on this... which leads to how changing of the namespace can be
> done
> > using mapreduce.
> >
> > If I recreate entities, then if the keys are stored as references in
> other
> > entities also needs to be recreated.
> > Ex.
> > class Party {
> > @Long id
> > Key<Tenant> tenantKey; // partitioning/filtering
> > String fname
> >
> > }
> >
> > I have several other entitities dependent on the Party Key.
> > class Invoice {
> > @Long id
> > Key<party> partyKey
> > ...}
> >
> > class Payment {
> > @Long id
> > Key<Party> partyKey
> >
> > }
> >
> > All invoices/Payments has to be re-created.
> >
> > So, how can this be done using mapreduce jobs. One option is
> > - Using mapreduce, all the Party entities are recreated. The originalkey
> > and the newkey is stored in a different mapping table, something like
> this
> > and operates in the empty namespace.
> > class MigrationMappingKeys {
> > @Long id;
> > Key<Party> oldKey
> > Key<Party> newKey
> >
> > }
> >
> > Then, I run the mapreduce job on the Invoice and Payment, and recreate
> based
> > on the above class.
> >
> > Any other options...?
> > -Aswath
> >
> > On Thu, Oct 28, 2010 at 3:25 PM, Didier Durand <[email protected]
> >wrote:
> >
> > > Hi,
> >
> > >http://code.google.com/appengine/docs/java/javadoc/com/google/appengi.
> ..
> > > says
> >
> > > "When a namespace aware class (e.g., Key, Query and MemcacheService)
> > > is constructed, it determines which namespace will be used by calling
> > > get() if it is otherwise unspecified. If get() returns null, the
> > > current namespace is unset and these APIs will use the empty ("")
> > > namespace in its place. "
> >
> > > So, I would guess that you have to recreate / copy your entities after
> > > having set namespace via NameSpaceManager.set() if you want to move
> > > them into a new namespace
> >
> > > regards
> > > didier
> >
> > > On Oct 28, 11:34 am, aswath satrasala <[email protected]>
> > > wrote:
> > > > Hello,
> > > > I have an multi-tenant app-id, and I have designed on partitioning
> the
> > > > entities based on url parameters. I am not using the namespace yet.
> >
> > > > For example,
> >
> > > > Tenant {
> > > > @Id name+email;
> >
> > > > }
> >
> > > > class Party {
> > > > @Long id
> > > > Key<Tenant> tenantKey; // partitioning/filtering
> > > > String fname
> >
> > > > }
> >
> > > > Now, I am planning to use the NamespaceManager for the Party
> entities. I
> > > > want to use the mapreduce and apply the namespace on the existing
> Party
> > > > entities.
> > > > Can a namespace be changed from empty to certain value on the
> existing
> > > > entity.
> >
> > > > -Aswathhttp://vs-accounting.appspot.com
> >
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