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From Sergi Vladykin <sergi.vlady...@gmail.com>
Subject Re: IgniteBinary, POJOs and indexing
Date Sat, 09 Jan 2016 10:10:13 GMT
I don't think we can easily implement this feature. Because it means that
we need some kind of "persistent configuration storage", which will be
consistent in all the scenarios of failures/restarts. So we have to design
this thing first keeping in mind that in the future we will store there not
only "dynamic indexes" but some other dynamic configuration as well.

I don't think I will be able to work on it myself but since it is going to
be a general mechanism mostly unrelated to SQL we can ask someone else to
pick it up.


2016-01-08 21:20 GMT+03:00 Dmitriy Setrakyan <dsetrakyan@apache.org>:

> Hi Andrey,
> The answer right now is simple. Yes, you can create classes and add fields
> at runtime. No, you cannot change indexes that you have created in cache
> configuration.
> However, you are raising a very valid point. We should be able to create
> and update indexes dynamically.  There is a ticket, IGNITE-735 [1], that
> has been sitting around for a while. I think we should reprioritize it.
> Sergi, can you please comment on how hard this would be to implement?
> [1] https://issues.apache.org/jira/browse/IGNITE-735
> On Fri, Jan 8, 2016 at 9:02 AM, Andrey Kornev <andrewkornev@hotmail.com>
> wrote:
> > Hello, Ignite Community,
> >
> > IgniteBinary javadocs mention the ability to dynamically change the
> > structure of the "classes" without restarting the cluster. The javadocs
> > even say that the new fields become automatically available to the SQL
> > queries with no extra effort. It's all fine and dandy, but how can I tell
> > Ignite that some of the new fields should also be indexed?
> >
> > Using the example from the same javadocs, my binary object initially has
> > two field A and B. I configure the cache entry metadata to index the
> field
> > A and then create the cache. When later I change the structure by adding
> a
> > new field C, how can I tell Ignite that I now want only fields B and C to
> > be included in the index?
> >
> > Related to above,  is there any way to modify the indexes after the cache
> > has been started? In this case I do not modify the structure of the
> class,
> > but rather change which fields get indexed, the sorting properties, etc.
> >
> > Finally, how about introducing new POJO classes at runtime (yes, I can do
> > it -- I run in OSGi environment)? For example, at the cache creation time
> > the cache metadata only had the POJOA class annotated to index its field
> > "foo", and then later the user introduces a new POJOB class annotated to
> > index its field "bar". Would POJOB start getting indexed automatically,
> or
> > the user will be given the finger?
> >
> > Any input will be very much appreciated!
> > Andrey
> >

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