Ok great, that's how I was hoping it worked, thanks guys,
Mark
On Jun 24, 3:46 am, "Nick Johnson (Google)" <nick.john...@google.com>
wrote:
> Hi Mark,
>
> No, write latency won't depend on the number of entities in the entity group
> - only on the rate of writes to the group.
>
> -Nick Johnson
>
>
>
>
>
> On Thu, Jun 24, 2010 at 5:12 AM, Mark <mar...@gmail.com> wrote:
> > Hi,
>
> > I've created two simple classes which I want to use in an entity
> > group:
>
> > class User {
> > int numReports;
> > }
>
> > class Report {
> > }
>
> > the User object will always be the parent, Report instances are part
> > of a User's entity group. There can be many Report objects per User:
>
> > User
> > |--- Report
>
> > when I save a Report instance, I want to increment the 'numReports'
> > counter in the User object, in a transaction. This arrangement works
> > fine.
>
> > But as the # of Report instances increase, does app engine have to
> > lock all other Report instances in the same entity group before
> > performing the transaction? I'm worried that performance will degrade
> > as the # of Report objects per User increases.
>
> > Thanks
>
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> --
> Nick Johnson, Developer Programs Engineer, App Engine Google Ireland Ltd. ::
> Registered in Dublin, Ireland, Registration Number: 368047
> Google Ireland Ltd. :: Registered in Dublin, Ireland, Registration Number:
> 368047
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