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From Alexandr Kuramshin <ein.nsk...@gmail.com>
Subject Re: Capacity Planning - Calculating Memory Usage
Date Thu, 22 Dec 2016 03:01:04 GMT
Hi Val,

the understanding is simple.

When you enables the single index on entry class you get "First index
overhead" per entry.

When you enables two indices on entry class you get "First index overhead"
+ "Next index overhead" per entry.

With three indices you get "First index overhead" + 2 * "Next index
overhead", and so on...

Each annotated field with @QuerySqlField is an index, except multiple
fields annotated with @QuerySqlField.Group.

Another way to defining indices is to use property "queryEntities" and it's
subproperty "indexes". See the article [1]

[1] https://apacheignite.readme.io/docs/indexes

2016-12-20 8:38 GMT+07:00 Valentin Kulichenko <valentin.kulichenko@gmail.com
>:

> Alexandr,
>
> Can you please clarify what is "First index overhead" and "Next index
> overhead"? Generally, I think overhead provided by indexes should be
> described in more details, now it's not very clear what happens when
> indexes are added.
>
> Also the calculation example should be a separate section.
>
> -Val
>
> On Wed, Dec 14, 2016 at 1:07 AM, Alexandr Kuramshin <ein.nsk.ru@gmail.com>
> wrote:
>
> > Thank you, Andrey,
> >
> > I'll do additional tests with expire policy and update the article.
> >
> > 2016-12-13 22:10 GMT+07:00 Andrey Mashenkov <andrey.mashenkov@gmail.com
> >:
> >
> > > Alexandr,
> > >
> > > In addition. If expire policy is configured, there is additional
> overhead
> > > to entries can be tracked by TtlManager.
> > > This overhead is OnHeap and does not depend on cache MemoryMode (until
> > > Ignite-3840 will be in master).
> > >
> > > For now overhead is about 32-40 bytes (EntryWrapper itself) + (40-48)
> > bytes
> > > (ConcurrentSkipList node) per entry.
> > >
> > >
> > >
> > > On Tue, Dec 13, 2016 at 10:37 AM, Alexandr Kuramshin <
> > ein.nsk.ru@gmail.com
> > > >
> > > wrote:
> > >
> > > > Hello, Igniters,
> > > >
> > > > I'd like to represent updated article [1] about the subject.
> > > >
> > > > And I'll very appreciate your comments and questions about it.
> > > >
> > > > Please review.
> > > >
> > > > [1] http://apacheignite.gridgain.org/docs/capacity-planning
> > > >
> > > > --
> > > > Thanks,
> > > > Alexandr Kuramshin
> > > >
> > >
> > >
> > >
> > > --
> > > С уважением,
> > > Машенков Андрей Владимирович
> > > Тел. +7-921-932-61-82
> > >
> > > Best regards,
> > > Andrey V. Mashenkov
> > > Cerr: +7-921-932-61-82
> > >
> >
> >
> >
> > --
> > Thanks,
> > Alexandr Kuramshin
> >
>



-- 
Thanks,
Alexandr Kuramshin

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