Why do you want to know? If there is a specific problem you're trying to solve, perhaps stating the problem itself will get you a better response.
Best Erick On Thu, Oct 28, 2010 at 4:00 AM, Li Li <fancye...@gmail.com> wrote: > is there anyone could help me? > > 2010/10/11 Li Li <fancye...@gmail.com>: > > hi all, > > I want to know the detail of IndexReader in SolrCore. I read a > > little codes of SolrCore. Here is my understanding, are they correct? > > Each SolrCore has many SolrIndexSearcher and keeps them in > > _searchers. and _searcher keep trace of the latest version of index. > > Each SolrIndexSearcher has a SolrIndexReader. If there isn't any > > update, all these searchers share one single SolrIndexReader. If there > > is an update, then a newSearcher will be created and a new > > SolrIndexReader associated with it. > > I did a simple test. > > A thread do a query and blocked by breakpoint. Then I feed some > > data to update index. When commit, a newSearcher is created. > > Here is the debug info: > > > > SolrCore _searcher [solrindexsearc...@...ab] > > > > _searchers[solrindexsearc...@...77,SolrIndexSearcher@ > ...ab,solrindexsearc...@..f8] > > solrindexsearc...@...77 's SolrIndexReader is old one > > and ab and f8 share the same newest SolrIndexReader > > When query finished solrindexsearc...@...77 is discarded. When > > newSearcher success to warmup, There is only one SolrIndexSearcher. > > The SolrIndexReader of old version of index is discarded and only > > segments in newest SolrIndexReader are referenced. Those segments not > > in new version can then be deleted because no file pointer reference > > them > > . > > Then I start 3 queries. There is only one SolrIndexSearcher but > RefCount=4. > > It seems many search can share one single SolrIndexSearcher. > > So in which situation, there will exist more than one > > SolrIndexSearcher that they share just one SolrIndexReader? > > Another question, for each version of index, is there just one > > SolrIndexReader instance associated with it? will it occur that more > > than one SolrIndexReader are opened and they are the same version of > > index? > > >
