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From Vladimir Ozerov <voze...@gridgain.com>
Subject Re: QueryDetailMetrics for cache-less SQL queries
Date Mon, 27 Aug 2018 10:20:12 GMT
Folks,

Can we leave query details metrics API unchanged, and simply fix how we
record them? Historically it worked as follows:
1) IgniteCache.query() is invoked
2) Query is executed, possibly on other caches!
3) Metric is incremented for cache from p.1

I.e. our query detail metrics were broken since their first days. I propose
to fix them as follows:
1) Any SQL query() method is invoked (see GridQueryProcessor)
2) We collect all cache IDs during parsing (this already happens)
3) Record event for all cache IDs through
GridCacheQueryManager#collectMetrics

This appears to be as the simplest and consistent solution to the problem.

On Tue, Aug 21, 2018 at 1:09 PM Evgenii Zhuravlev <e.zhuravlev.wk@gmail.com>
wrote:

> 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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