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From John Wang <john.w...@gmail.com>
Subject Re: Realtime search best practices
Date Mon, 12 Oct 2009 20:18:06 GMT
Oh, that is really good to know!
Is this deterministic? e.g. as long as writer.addDocument() is called, next
getReader reflects the change? Does it work with deletes? e.g.
writer.deleteDocuments()?
Thanks Mike for clarifying!

-John

On Mon, Oct 12, 2009 at 12:11 PM, Michael McCandless <
lucene@mikemccandless.com> wrote:

> Just to clarify: IndexWriter.newReader returns a reader that searches
> uncommitted changes as well.  Ie, you need not call IndexWriter.commit
> to make the changes visible.
>
> However, if you're opening a reader the "normal" way
> (IndexReader.open) then it is necessary to first call
> IndexWriter.commit.
>
> Mike
>
> On Mon, Oct 12, 2009 at 5:24 AM, melix <cedric.champeau@lingway.com>
> wrote:
> >
> > Hi,
> >
> > I'm going to replace an old reader/writer synchronization mechanism we
> had
> > implemented with the new near realtime search facilities in Lucene 2.9.
> > However, it's still a bit unclear on how to efficiently do it.
> >
> > Is the following implementation the good way to do achieve it ? The
> context
> > is concurrent read/writes on an index :
> >
> > 1. create a Directory instance
> > 2. create a writer on this directory
> > 3. on each write request, add document to the writer
> > 4. on each read request,
> >  a. use writer.getReader() to obtain an up-to-date reader
> >  b. create an IndexSearcher with that reader
> >  c. perform Query
> >  d. close IndexSearcher
> > 5. on application close
> >  a. close writer
> >  b. close directory
> >
> > While this seems to be ok, I'm really wondering about the performance of
> > opening a searcher for each request. I could introduce some kind of delay
> > and cache a searcher for some seconds, but I'm not sure it's the best
> thing
> > to do.
> >
> > Thanks,
> >
> > Cedric
> >
> >
> > --
> > View this message in context:
> http://www.nabble.com/Realtime-search-best-practices-tp25852756p25852756.html
> > Sent from the Lucene - Java Users mailing list archive at Nabble.com.
> >
> >
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> >
>
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