Right, the field must have a single token for FieldCache. But if you are on 4.x you can use DocTermOrds (FieldCache.getDocTermOrds) which allows for multiple tokens per field.
Mike McCandless http://blog.mikemccandless.com On Wed, Jun 20, 2012 at 9:47 AM, Li Li <fancye...@gmail.com> wrote: > 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 >> >> --------------------------------------------------------------------- To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org For additional commands, e-mail: java-user-h...@lucene.apache.org
