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From Alexey Kuznetsov <akuznet...@gridgain.com>
Subject Re: Scan query with page size should return as first page available
Date Fri, 08 May 2015 01:17:52 GMT
Val, yes I remember that I tested with one node.
But I will recheck with several nodes today and give more info.

On Fri, May 8, 2015 at 2:38 AM, Valentin Kulichenko <
valentin.kulichenko@gmail.com> wrote:

> Alexey,
>
> Do you have only one server node? In this case query is considered to be
> local and pagination is disabled. Really looks like redundant iteration.
>
> I also noticed that IgniteCacheProxy.query(Query filter, @Nullable
> ClusterGroup grp) method on line 347 ignores page size parameter (added a
> comment in ticket).
>
> --
> Val
>
> On Thu, May 7, 2015 at 8:32 AM, Alexey Kuznetsov <akuznetsov@gridgain.com>
> wrote:
>
> > Sergi.
> >
> > I put 1M entries in cache. Execute scan query from Visor and see 1M reads
> > in cache metrics (and I do not even hit "Next page" button).
> > Also more entries in cache results in more longer execution time of scan
> > query to wait for first page to show in Visor.
> >
> > Please take a look at VisorQueryJob code (line 75...).
> >
> > By default Visor use 100 rows as page size.
> >
> > I expect that take first 100 rows for scan query should be very fast.
> >
> > On Thu, May 7, 2015 at 10:19 PM, Sergi Vladykin <
> sergi.vladykin@gmail.com>
> > wrote:
> >
> > > Alexey,
> > >
> > > How did you come to this conclusion? I don't see anything like that in
> > our
> > > code, we just take keySet or primaryKeySet iterator and fetch it page
> by
> > > page.
> > >
> > > Sergi
> > >
> > > 2015-05-07 9:58 GMT+03:00 Dmitriy Setrakyan <dsetrakyan@apache.org>:
> > >
> > > > I have filed a ticket for this issue:
> > > > https://issues.apache.org/jira/browse/IGNITE-872
> > > >
> > > > Sergey, since it has to do with queries, can you please take a look?
> > > >
> > > > Thanks,
> > > > D.
> > > >
> > > > On Thu, May 7, 2015 at 1:47 AM, Alexey Kuznetsov <
> > > akuznetsov@gridgain.com>
> > > > wrote:
> > > >
> > > > > Hello All!
> > > > >
> > > > > Just found that if I have many entries in cache and do the scan
> query
> > > > with
> > > > > page size 100
> > > > > then my query seems to iterate over the whole cache and only after
> > > that I
> > > > > could fetch first page of data.
> > > > >
> > > > > I think that it should be reworked to return first page as fast as
> > > > possible
> > > > > - without of waiting while scan query will be completed.
> > > > >
> > > > > Thoughts?
> > > > >
> > > > > --
> > > > > Alexey Kuznetsov
> > > > > GridGain Systems
> > > > > www.gridgain.com
> > > > >
> > > >
> > >
> >
> >
> >
> > --
> > Alexey Kuznetsov
> > GridGain Systems
> > www.gridgain.com
> >
>



-- 
Alexey Kuznetsov
GridGain Systems
www.gridgain.com

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