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From Evgenii Zhuravlev <e.zhuravlev...@gmail.com>
Subject Re: QueryDetailMetrics for cache-less SQL queries
Date Tue, 21 Aug 2018 10:08:38 GMT
Hi Alex,

I agree that we can't move all metrics to ignite.metrics() and SPI metrics
is a good example here. I propose to move at least dataRegionMetrics,
dataStorageMetrics to it, since the main API class is not a good place for
such things. If we will decide to choose option 1 from my first message,
then, I will also add QueryDetailMetrics for cacheless queries to this new
class.

пн, 20 авг. 2018 г. в 23:28, Alex Plehanov <plehanov.alex@gmail.com>:

> Hi Evgeny,
>
> Do you propose to move into IgniteMetrics absolutely all Ignite metrics or
> just dataRegionMetrics, dataStorageMetrics and queryDetailMetrics? I think
> you can't move all metrics into one place. Pluggable components and
> different SPI implementations may have their own metric sets, and perhaps
> it's not such a good idea to try to fit them in one common fixed interface.
>
> 2018-08-20 18:14 GMT+03:00 Evgenii Zhuravlev <e.zhuravlev.wk@gmail.com>:
>
> > As for now, metrics are accumulated for cache only when the query is run
> > directly over this cache, for example, using ignite.cache("Some
> > cache").sqlFieldsQuery("select ... from .."). When a query is started
> using
> > other APIs, it doesn't detect cache, to which this table belongs and
> > doesn't save any metrics.
> >
> >
> >
> > 2018-08-17 16:44 GMT+03:00 Vladimir Ozerov <vozerov@gridgain.com>:
> >
> > > Query is not executed on specific cache. It is executed on many caches.
> > >
> > > On Fri, Aug 17, 2018 at 6:10 AM Dmitriy Setrakyan <
> dsetrakyan@apache.org
> > >
> > > wrote:
> > >
> > > > But internally the SQL query still runs on some cache, no? What
> happens
> > > to
> > > > the metrics accumulated on that cache?
> > > >
> > > > D.
> > > >
> > > > On Thu, Aug 16, 2018, 18:51 Alexey Kuznetsov <akuznetsov@apache.org>
> > > > wrote:
> > > >
> > > > > Dima,
> > > > >
> > > > > "cache-less" means that SQL executed directly on SQL engine.
> > > > >
> > > > > In previous version of Ignite we execute queries via cache:
> > > > >
> > > > > ignite.cache("Some cache").sqlFieldsQuery("select ... from ..")
> > > > >
> > > > > In current Ignite we can execute query directly without using cache
> > as
> > > > > "gateway".
> > > > >
> > > > > And if we execute query directly, metrics not update.
> > > > >
> > > > >
> > > > >
> > > > >
> > > > > On Fri, Aug 17, 2018 at 4:21 AM Dmitriy Setrakyan <
> > > dsetrakyan@apache.org
> > > > >
> > > > > wrote:
> > > > >
> > > > > > Evgeny, what is a "cache-less" SQL query?
> > > > > >
> > > > > > D.
> > > > > >
> > > > > > On Thu, Aug 16, 2018 at 6:36 AM, Evgenii Zhuravlev <
> > > > > > e.zhuravlev.wk@gmail.com
> > > > > > > wrote:
> > > > > >
> > > > > > > Hi Igniters,
> > > > > > >
> > > > > > > I've started to work on adding QueryDetailMetrics for
> cache-less
> > > SQL
> > > > > > > queries(issue
> https://issues.apache.org/jira/browse/IGNITE-6677)
> > > and
> > > > > > found
> > > > > > > that it's required to change API. I don't think that adding
> > methods
> > > > > like
> > > > > > > queryDetailMetrics, resetQueryDetailMetrics, as in IgniteCache
> to
> > > > > Ignite
> > > > > > > class is a good idea. So, I see 2 possible solutions here:
> > > > > > >
> > > > > > > 1. Create IgniteMetrics(ignite.metrics()) and move metrics
from
> > > > > > > Ignite(like dataRegionMetrics and dataStorageMetrics) and
add a
> > new
> > > > > > > metric "queryDetailMetrics" to it. Of course, old methods
will
> be
> > > > > > > deprecated.
> > > > > > >
> > > > > > > 2. Finally create Ignite.sql() API, which was already discussed
> > > here:
> > > > > > > http://apache-ignite-developers.2346864.n4.nabble.
> > > > > > > com/Rethink-native-SQL-API-in-Apache-Ignite-2-0-td14335.html
> > > > > > > and place "queryDetailMetrics" metric there. Here is the
ticket
> > for
> > > > > this
> > > > > > > change: https://issues.apache.org/jira/browse/IGNITE-4701
> > > > > > >
> > > > > > > Personally, I think that the second solution looks better
in
> this
> > > > case,
> > > > > > > however, moving dataRegionMetrics and dataStorageMetrics
to
> > > > > > > ignite.matrics() is still a good idea - IMO, Ignite class
is
> not
> > > the
> > > > > > right
> > > > > > > place for them - we shouldn't change our main API class
so
> often.
> > > > > > >
> > > > > > > What do you think?
> > > > > > >
> > > > > > > Thank you,
> > > > > > > Evgenii
> > > > > > >
> > > > > >
> > > > > > --
> > > > > > Alexey Kuznetsov
> > > > > >
> > > > > >
> > > > >
> > > >
> > >
> >
>

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