Thank you, that helped me a lot.
Sven Teichmann
______________________________________________________
Software for Intellectual Property GmbH
Gewerbering 14a
83607 Holzkirchen (Germany)
Phone: +49 (0)8024 46699-00
Fax: +49 (0)8024 46699-02
E-Mail: s.teichm...@s4ip.de
Local Court of Munich HRB 125803, UstId DE201282006
General Manager: Alexander Wagner
______________________________________________________
Am 16.05.2014 12:24, schrieb Michael McCandless:
On Tue, May 13, 2014 at 1:34 AM, Sven Teichmann <s.teichm...@s4ip.de> wrote:
Hi,
I also found this response very useful and right now I am playing around
with DocValues.
If the default DocValuesFormat isn't fast enough, you can always
switch to e.g. DirectDocValuesFormat (uses lots of RAM but it just an
array lookup).
How do I switch do DirectDocValuesFormat? And how do I receive the DocValues
then?
Create your own subclass of Lucene46Codec, override the
"getDocValuesForField(String field)" method to return
DocValuesFormat.forName("Direct") for the fields you want to use
DirectDVFormat on.
Regardless of what DVFormat you use, retrieving them is always through
the same API (AR.getXXXDocValues()). If you really want to retrieve
DocValues against a top-level reader, use MultiDocValues.getXXXValues,
but note that then there is a per-lookup binary search penalty, so
it's better to work directly with each SegmentReader if that
performance cost matters to you (which, given that you want to cutover
to DirectDVF, it must).
Mike McCandless
http://blog.mikemccandless.com
Sven
Am 07.05.2014 16:09, schrieb Wouter Heijke:
Hey Mike,
That was a very useful response, also for long time Lucene users like
myself who were stuck in legacy ways of doing things!
I managed to easily change indexing of keys to DocValues and found myself
wondering why I did not get anything returned, it appears indexing works
transparent to any field, but to get your DocValue key out of the 'index'
you need to use the AtomicReader... all now works like it did before, only
faster (i hope ;-))
Wouter
Doc values is far faster than a stored field.
If the default DocValuesFormat isn't fast enough, you can always
switch to e.g. DirectDocValuesFormat (uses lots of RAM but it just an
array lookup).
Mike McCandless
http://blog.mikemccandless.com
On Tue, May 6, 2014 at 4:33 AM, Sven Teichmann <s.teichm...@s4ip.de>
wrote:
Hi,
what is the best way to retrieve our "real" ids (as they are in our
database) while searching?
Right now we generate a file after indexing which contains all Lucene
docids
and the matching id in our database. Our own Collector converts the
docids
to our ids while collecting. This works as long as no document is
deleted
and the index optimized after it.
Is this a good solution or should we use Fields or DocValues for this?
What
is the fastest solution?
Regards,
Sven Teichmann
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