Hi,
I actually don't follow your change, because after "but changing it to" line
the only different thing I see is the doc.add(dateField) call, which you didn't
list before "but changing it to".
Also, if I understood Uwe correctly, he was suggesting reusing NumericField
instances, which means "new NumericField("date")" should exist and be called
for only *once* in your code. The same for Document instances. GC threads
will thank you and Uwe for this change.
Otis
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----- Original Message ----
> From: Tomislav Poljak <tpol...@gmail.com>
> To: java-user@lucene.apache.org
> Sent: Thu, April 15, 2010 7:41:02 AM
> Subject: RE: NumericField indexing performance
>
> Hi Uwe,
thank you very much for your answers. I've done Document
> and
NumericField reuse like this:
Document doc =
> getDocument();
NumericField dateField = new NumericField("date");
for
> each
> doc:
doc.add(dateField.setLongValue(Long.parseLong(DateTools.dateToString(date),
> DateTools.Resolution.MINUTE))));
,but changing it to:
Document doc
> = getDocument();
NumericField dateField = new
> NumericField("date");
doc.add(dateField);
for each
> doc:
dateField.setLongValue(Long.parseLong(DateTools.dateToString(date),
DateTools.Resolution.MINUTE)));
did
> the trick. Now indexing with NumericField takes minutes, not
> hours.
Thanks again,
Tomislav
On Wed,
> 2010-04-14 at 23:38 +0200, Uwe Schindler wrote:
> One addition:
> If
> you are indexing millions of numeric fields, you should also try to reuse
> NumericField and Document instances (as described in JavaDocs). NumericField
> creates internally a NumericTokenStream and lots of small objects
> (attributes),
> so GC cost may be high. This is just another idea.
>
> Uwe
>
>
> -----
> Uwe Schindler
> H.-H.-Meier-Allee 63, D-28213
> Bremen
>
> >http://www.thetaphi.de
> eMail:
> href="mailto:u...@thetaphi.de";>u...@thetaphi.de
>
>
> >
> -----Original Message-----
> > From: Uwe Schindler [mailto:
> ymailto="mailto:u...@thetaphi.de";
> href="mailto:u...@thetaphi.de";>u...@thetaphi.de]
> > Sent: Wednesday,
> April 14, 2010 11:28 PM
> > To:
> ymailto="mailto:java-user@lucene.apache.org";
> href="mailto:java-user@lucene.apache.org";>java-user@lucene.apache.org
>
> > Subject: RE: NumericField indexing performance
> >
> >
> Hi Tomislav,
> >
> > indexing with NumericField takes longer
> (at least for the default
> > precision step of 4, which means out of
> 32 bit integers make 8 subterms
> > with each 4 bits of the value). So
> you produce 8 times more terms
> > during indexing that must be handled
> by the indexer. If you have lots
> > of documents, with distinct values
> the term index gets larger and
> > larger, but search performance
> increases dramatically (for
> > NumericRangeQueries). So if you index
> *only* numeric fields and nothing
> > else, a 8 times slower indexing
> can be true.
> >
> > If you are not using NumericRangeQuery
> or you want tune indexing
> > performance, try larger precision Steps
> like 6 or 8. If you don’t use
> > NumericRangeQuery and only want to
> index the numeric terms as *one*
> > term, use
> precStep=Integer.MAX_VALUE. Also check your memory
> > requirements, as
> the indexer may need more memory and GC costs too
> > much. Also the
> index size will increase, so lots of more I/O is done.
> > Without more
> details I cannot say anything about your configuration. So
> > please
> tell us, how many documents, how many fields and how many
> > numeric
> fields in which configuration do you use?
> >
> > Uwe
>
> >
> > -----
> > Uwe Schindler
> >
> H.-H.-Meier-Allee 63, D-28213 Bremen
> >
> href="http://www.thetaphi.de"; target=_blank >http://www.thetaphi.de
>
> > eMail:
> href="mailto:u...@thetaphi.de";>u...@thetaphi.de
> >
> >
>
> > > -----Original Message-----
> > > From: Tomislav
> Poljak [mailto:
> href="mailto:tpol...@gmail.com";>tpol...@gmail.com]
> > > Sent:
> Wednesday, April 14, 2010 8:13 PM
> > > To:
> ymailto="mailto:java-user@lucene.apache.org";
> href="mailto:java-user@lucene.apache.org";>java-user@lucene.apache.org
>
> > > Subject: NumericField indexing performance
> > >
>
> > > Hi,
> > > is it normal for indexing time to increase up to
> 10 times after
> > > introducing NumericField instead of Field (for
> two fields)?
> > >
> > > I've changed two date fields
> from String representation (Field) to
> > > NumericField, now it
> is:
> > >
> > > doc.add(new
> NumericField("time").setIntValue(date.getTime()/24/3600))
> >
> >
> > > and after this change indexing took 10x more time (before
> it was few
> > > minutes and after more than an hour and half). I've
> tested with a
> > > simple
> > > counter like
> this:
> > >
> > > doc.add(new
> NumericField("endTime").setIntValue(count++))
> > >
> >
> > but nothing changed, it still takes around 10x longer. If I comment
>
> > > adding one numeric field to index time drops significantly and if
> I
> > > comment both fields indexing takes only few minutes
> again.
> > >
> > > Tomislav
> > >
>
> > >
> > >
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