How much does the CPU time increase by? On Wed, Jan 20, 2010 at 1:59 PM, Lucian Baciu <lucianba...@gmail.com> wrote:
> In total my model has about 4000 entities. The shape of my model is
> like this: a root entity that has many owned one to many
> relationships
> (about 10), and each children collection can have hundreds or
> thousands of child entities in them, something like:
>
> public class Account{
> @Persistent(mappedBy = "account")
> @Order(extensions = @Extension(vendorName="datanucleus",
> key="list-
> ordering", value="key asc"))
> private List<Child1> children1;
> @Persistent(mappedBy = "account")
> @Order(extensions = @Extension(vendorName="datanucleus",
> key="list-
> ordering", value="key asc"))
> private List<Child2> children2;
> //....
> @Persistent(mappedBy = "account")
> @Order(extensions = @Extension(vendorName="datanucleus",
> key="list-
> ordering", value="key asc"))
> private List<Child10> children10;
> }
>
> Yes my inserts are in transaction. I've marked all entity properties
> not used in custom indexes as unindexed, but I still see the same
> problem. The CPU time continues to increase for the same insert
> operation of one entity as the group gets larger. Also, I have no
> custom indexes with two list properties, so I don't think I have an
> exploding index problem.
>
>
> On Jan 20, 11:45 pm, "Ikai L (Google)" <ika...@google.com> wrote:
> > How many child entities does a model have? Is it in a transaction? Index
> > updates are synchronous, though a simple update to the index should not
> > dramatically increase the insert time.
> >
> > In addition to reducing the indexed properties, you may also want to look
> at
> > inserting entities asynchronously via the Task Queue. It won't reduce the
> > insert time, but it will reduce the amount of time your application
> spends
> > serving a response to a user.
> >
> > On Mon, Jan 18, 2010 at 11:30 AM, Lucian Baciu <lucianba...@gmail.com
> >wrote:
> >
> >
> >
> >
> >
> > > That's a great video, but I don't think it can help me. I think my
> > > model is right, it is basically 1 to many owned relationship and as
> > > the number of child entities grows so does the insert operations time.
> > > I can't figure out why! Any idea why???
> >
> > > Thanks,
> > > Lucian
> >
> > > On Jan 15, 8:55 pm, "Ikai L (Google)" <ika...@google.com> wrote:
> > > > Brett Slakin on the App Engine team gave a great talk about a problem
> > > > similar to what you are describing at last year's Google I/O and how
> to
> > > > solve it. You may want to check this video out:
> >
> > > >
> http://code.google.com/events/io/2009/sessions/BuildingScalableComple...
> >
> > > > <
> http://code.google.com/events/io/2009/sessions/BuildingScalableComple..
> > > .>How
> > > > are your models current set up?
> >
> > > > On Fri, Jan 15, 2010 at 1:10 AM, Lucian Baciu <lucianba...@gmail.com
> >
> > > wrote:
> > > > > I have a root User entity and a child Note entity. Each User can
> have
> > > > > many Note entities. The Note entity has four indices.
> >
> > > > > I've noticed that as the number of Note entities for a User
> increases
> > > > > so does the request time/latency and CPU used on Note insert
> > > > > operations. When the number on Note entities for a user is about
> 1000,
> > > > > an insert Note request takes about 10 seconds in request time and
> > > > > about 40 seconds of CPU, which is very high and as it continues to
> > > > > increase it makes my app unusable.
> >
> > > > > Is there something I can do to optimize this, or is this an app
> engine
> > > > > issue?
> >
> > > > > Thanks,
> > > > > Lucian
> >
> > > > > --
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> > > > --
> > > > Ikai Lan
> > > > Developer Programs Engineer, Google App Engine
> >
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> > --
> > Ikai Lan
> > Developer Programs Engineer, Google App Engine
>
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>
>
--
Ikai Lan
Developer Programs Engineer, Google App Engine
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