I am having a similar need in these days; this should be a very useful
feature, but I'd like more something I could use with the existing API
like
enableFullTextFilter( "MyShardsSelectionStrategy" ).setParameter( ... )
a practical example:
enableFullTextFilter( "LanguageFilter" ).setParameter( "IT-it" )
The existing IndexShardingStrategy should be able to be smarter and
have something like
DirectoryProvider<?>[] getDirectoryProvidersForQuery( filters && options )
So a smart ShardingStrategy could do some selections considering this.
I'm currently using sharding to shard my index on 25 different
languages (using per-language stemmers), so this would
be useful but I'd especially need to be able to "label" my different
DirectoryProviders using String identifiers,
I'd suggest to add a getName() to the DirectoryProvider interface: I
would use that to store countrycodes and
keep a map<String,DirectoryProvider> in my ShardingStrategy, so I can
easily select the right DP when
the LanguageFilter is enabled.
Another usage would be to shard an entity on an Enumerated property:
in this case an appropriate ShardingStrategy
could be provided by Search and auto-configured by reading the
possible enum values: that would be a very easy way
to enable sharding on an entity.
Sanne
2009/6/3 Emmanuel Bernard <emmanuel(a)hibernate.org>:
Begin forwarded message:
From: chase.seibert+opensubscriber(a)gmail.com
Date: June 3, 2009 09:21:21 PDT
To: emmanuel(a)hibernate.org
Subject: Re: Re: [hibernate-dev] HSearch: Using sharding and avoiding query
on multiple shards
Reply-To: chase.seibert+opensubscriber(a)gmail.com
Emmanuel,
Regarding HSEARCH-251, and
http://www.opensubscriber.com/message/hibernate-dev@lists.jboss.org/97703...
Being able to query just a single shard or subset of shards would be
awesome. I was thinking of a similar API:
IndexShardingStrategy:
public DirectoryProvider<?>[]
getDirectoryProviderForShard(int shardNum);
FullTextQuery:
public void enableShardFilter(int shardNum);
public void enableShardFilters(int[] shardNums);
FullTextQuery.buildSearcher() would need to be modified to call
getDirectoryProviderForShard() for each shardNum if shardNums are set,
otherwise it should continue to use getDirectoryProvidersForAllShards();
Calling this API from a consumer's stand-point would look like:
FullTextQuery fullTextQuery =
fullTextSession.createFullTextQuery(luceneQuery, entityClass);
fullTextQuery.enableShardFilter(5);
fullTextQuery.list();
This could be changed to pass named shards easily. I could prototype this
and submit a .patch if you are interested.
-Chase
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