[infinispan-dev] Need help: ISPN-2143

[Manik Surtani]

On 12 Apr 2013, at 11:14, Sanne Grinovero <sanne at infinispan.org> wrote:

> Thanks Israel! You're very welcome back.
> 
> In mandating the types :
> 
> First problem is you either change the method signature or you need to throw a runtime exception when the varargs array is empty.
> 
> More importantly, the query targets are supposed to be polymorphic and we actually need the list of class definitions of the subtypes too.
> 
> The easy solution is to have them all listed in the configuration.
> 
> Alternatively if you have users list all index names,  we can initialize them eagerly and query the index for known class types, but this is problematic as 
> - harder to check the configuration is consistent with runtime usage 
> - such a query would need to be run periodically (before any other query?) to catch new types inserted by other nodes 
> - some parameters of how the index is opened are actually inferred from the indexed types : this would need no be a two phases index initialization.
> 
> Most user friendly solution is class path scanning,  as we do in Hibernate.
> 
Maybe then that is the best approach here as well?  Make it a part of the cache startup.  Or maybe just the SearchManager's initialisation.  SearchManagers will only be able to search for the types it has been told about when initialised.
> As a side note : Hibernate Search had to implement capability to transparently hot-restart itself to support the dynamic type discovery of Infinispan but really that code hurts my eyes and is very tricky to maintain: every new functionality needs to be designed for it and tested for services or new configuration details which could appear at any time.  I would love to remove it.
> 
Yes, I remember.  I requested this feature.  :)
> Sanne
> 
> On Apr 12, 2013 10:42 AM, "Manik Surtani" <msurtani at redhat.com> wrote:
> Mandating passing in the types in SearchManager.getQuery() won't work?
> 
> On 11 Apr 2013, at 20:50, Sanne Grinovero <sanne at infinispan.org> wrote:
> 
>> That's correct. It does not affect only joiners though,  there are several cases:
>> 
>> - first node starting but having existing data in some CacheStore 
>> - node A does a put with new type,  existing node B then runs a query
>> 
>> Looks like the easy solution is to store the set of known types as an entry,  but even assuming there are no classloader issues there are some not so clear side effects,  such as statistics getting skewed and similar.
>> 
>> On Apr 11, 2013 8:24 PM, "Manik Surtani" <msurtani at redhat.com> wrote:
>> I presume this is to deal with the case when a node joins the cluster (shared index), and someone does a SearchManager.getQuery() without passing in any types?  Is that correct?  If a type or more than one type is passed in to that method then you don't have this problem, right?
>> 
>> - M
>> 
>> 
>> On 11 Apr 2013, at 18:40, Sanne Grinovero <sanne at infinispan.org> wrote:
>> 
>> > This issue has been assigned to me for long, but I'm unable to find
>> > time to work on it soon. Still, it's quite an important one, quite
>> > annoying it's still open.
>> >
>> > Any volunteer?
>> >
>> > Requires a bit of coding in the Query module, but is totally unrelated
>> > to Lucene so anyone familiar with Infinispan could do it.
>> >
>> > Cheers,
>> > Sanne
>> > _______________________________________________
>> > infinispan-dev mailing list
>> > infinispan-dev at lists.jboss.org
>> > https://lists.jboss.org/mailman/listinfo/infinispan-dev
>> 
>> --
>> Manik Surtani
>> manik at jboss.org
>> twitter.com/maniksurtani
>> 
>> Platform Architect, JBoss Data Grid
>> http://red.ht/data-grid
>> 
>> 
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> 
> --
> Manik Surtani
> manik at jboss.org
> twitter.com/maniksurtani
> 
> Platform Architect, JBoss Data Grid
> http://red.ht/data-grid
> 
> 
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--
Manik Surtani
manik at jboss.org
twitter.com/maniksurtani

Platform Architect, JBoss Data Grid
http://red.ht/data-grid

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