I'm sure that Filters are thread safe. Lucene doesn't have a global caching mechanism as such. But see FieldCache - you might get better performance from FieldCacheTermsFilter than from TermsFilter. See also CachingWrapperFilter and QueryWrapperFilter.
-- Ian. On Mon, Feb 25, 2013 at 1:16 AM, Wei Wang <welshw...@gmail.com> wrote: > Hi, > > I am a Lucene user and I have a few questions about Lucene filters. > I appreciate it if someone can shed light on this. > > 1. Is Lucene filters such as TermsFilter thread-safe in general? > The semantics of a Filter is fixed, unless a filter maintains some > private state information, theoretically it could be thread-safe and > the same Filter can be used by multiple queries at the same time. > > 2. Does Lucene has a global Caching mechanism for filters or even > queries? Or a user has to manage them by himself? > It probably can better use resource if the cached filters/queries > are managed at a central place. I noticed FilterManager was removed > from Lucene 4. Is there another class replacing FilterManager? > > Thanks! > Wei > > --------------------------------------------------------------------- > 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
