Hi, I would like an expert opinion about how to optimally do concurrent searches on the same index (let's suppose there are several threads doing searches). Consider these options:
a) one IndexReader, all threads use it b) cloned IndexReader's, each thread uses a clone c) opened IndexReader's, each thread open and keeps its own IndexReader What I would like to achieve is: x) maximum CPU and memory efficiency (e.g. only one copy of norms vectors, only one copy of FieldCache for a segment) y) avoid performance issues related to locks z) let each thread have an atomic view of the index, i.e. do a reopen when it wants (and with no coordination with other threads) I think z) is impossible to achieve with a). Is it best to do b) or c) ? I'm afraid c) implies multiple copy of the norms (!), while I'm not sure about the FieldCache. I'm talking about version 3.0, but I would be really interested to hear if newer versions have different characteristics. Thanks. -- Roberto Ragusa mail at robertoragusa.it --------------------------------------------------------------------- To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org For additional commands, e-mail: java-user-h...@lucene.apache.org
