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Subject: SV: Lucene hits.length()
Date: Wed, 9 Aug 2006 15:22:33 +0200
Message-ID: 
 <8834A84C87A2C148AD46921BB8BFC97C021E5643@S1SE1MAIL.emea1.ad.group>
Thread-Topic: Lucene hits.length()
Thread-Index: Aca7C+Fj84tw2IeNS6OJqpghPBbraAAqt/qg
From: "Marcus Falck" <marcus.falck@observer.se>
To: <java-user@lucene.apache.org>

I'm opening a new searcher every 3:rd minute.=20

-----Ursprungligt meddelande-----
Fr=E5n: Erick Erickson [mailto:erickerickson@gmail.com]=20
Skickat: den 8 augusti 2006 18:58
Till: java-user@lucene.apache.org
=C4mne: Re: Lucene hits.length()

I'll take a stab at it.... When are you opening/closing your searcher? =
When
you open a searcher, you get a snapshot of the index at that instant, =
and
subsequent modifications aren't visible until you open a new searcher =
(at
least I think I've got this right).

And I'm sure this also interacts with the writer merge settings
"interestingly".

Personally, I'd worry about this a lot more if it happened after I'd =
closed
my writer and opened a new reader <G>...
Of course, my app has an index that is updated rarely (every two weeks), =
so
I haven't dug into too many details in this area...


Best
Erick

On 8/8/06, Marcus Falck <marcus.falck@observer.se> wrote:
>
> I have noticed some strange behavior when searching my lucene index.
>
>
>
> I'm adding 500.000 docs to an index.
>
>
>
> MergeFactor =3D 10
>
> MinMerge =3D 5000
>
>
>
> When 49999 have been added ( just before the first 10 * 5000 merge ) =
the
> hits.length() is reporting around 1000 hits for a keyword (which by =
the
> way is around the same count as with 5000 docs added). After the =
10*5000
> merge the hits.length() returns around 8000 hits, which seems to be a
> lot more reasonable. Since I'm adding content in date order ( oldest
> first ) I have also tried to sort the hits (newest date first) and
> display the top 10 hits.
>
>
>
> According to that output it seems that the documents are added
> correctly.
>
>
>
> I'm using a multisearcher on top of a RAMDir and an FSDir. Using
> Lucene1.4.3
>
>
>
> Anybody that has any idea about why the hit count is so misleading?
>
>
>
> /
>
> Regards
>
> Marcus
>
>
>
>
>
>
>


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