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,solrindexsearc...@...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? >
