but as l can remember, in 2.9.x FieldCache can only apply to indexed but not analyzed fields. 在 2012-6-20 晚上8:59，"Danil ŢORIN" <torin...@gmail.com>写道：
> I think you are looking for FieldCache. > > I'm not sure the current status in 4x, but it worked in 2.9/3.x. > Basically it's an array, so access is quite straight forward, and the > best part IndexReader manage those for you, so on reopen only new > segments are read. > > Small catch is that FiledCaches are per segment, so you need to be > careful if you want to retrieve data using global document ids. > However if you are building result set in your own Collector, using > FieldCache is quite straight forward. > > > On Wed, Jun 20, 2012 at 3:49 PM, Li Li <fancye...@gmail.com> wrote: > > hi all > > I need to return certain fields of all matched documents quickly. > > I am now using Document.get(field), but the performance is not well > > enough. Originally I use HashMap to store these fields. it's much > > faster but I have to maintain two storage systems. Now I am > > reconstructing this project. I want to store everything in lucene. > > when I use an IndexSearcher to perform searching, I can get > > related fields by docID. it must thread safe. And like the IndexReader > > it's a snapshot of the index > > Here are some solutions I can come up with: > > 1. StringIndex > > I have considered StringIndex but some fields need to tokenize. > > maybe I can use two fields, one is tokenized for searching. Another is > > indexed but not analyzed, the later one is only used for StringIndex. > > If there is any better solution, maybe I have to use this one. > > 2. Associating a Map with each IndexReader > > when the IndexReader is opened or reopened, I need to iterate > > through each documents of this Reader and put everything into a map. > > The problem is it's slower and I don't know whether it's problematic > > with NRT. > > > > is there any other better solution? thanks. > > > > --------------------------------------------------------------------- > > To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org > > For additional commands, e-mail: java-user-h...@lucene.apache.org > > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org > For additional commands, e-mail: java-user-h...@lucene.apache.org > >
