See below On Tue, Apr 26, 2011 at 6:15 PM, cyang2010 <ysxsu...@hotmail.com> wrote: > Hi, > > I was wondering if solr open a new lucene IndexReader for every query > request? > no, absolutely not. Solr only opens a reader when the underlying index has changed, say a commit or a replication happens.
> From performance point of view, is there any problem of opening a lot of > IndexReaders concurrently, or application shall have some logic to reuse the > same IndexReader? Every time you open a reader, a whole new set of caches are initiated. I have a hard time imagining a situation in which opening a new searcher for each request would be a good idea. Opening a new reader, especially for a large index is a very expensive operation and should be done as rarely as possible. But Solr will do this automatically for you, by and large you don't have to think about it. Best Erick > > > Thanks, > > > cy > > > > > -- > View this message in context: > http://lucene.472066.n3.nabble.com/Reader-per-query-request-tp2867778p2867778.html > Sent from the Solr - User mailing list archive at Nabble.com. >
