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From Simon Willnauer <simon.willna...@gmail.com>
Subject Re: StoredFieldsFormat / documentation
Date Thu, 24 Jan 2013 09:22:16 GMT
Hi Bernd,


On Thu, Jan 24, 2013 at 9:30 AM, Bernd Müller <belunto@googlemail.com> wrote:
> Hello,
>
> In the lucene 4.1 release, there was introduced a compression for
> stored fields as described here:
> https://issues.apache.org/jira/browse/LUCENE-4226

yeah that is correct, its the new default. if you use Lucene 4.1 this
will be enabled and used by default for all stored fields.
there is also a blog post about the stored fields format
http://blog.jpountz.net/post/33247161884/efficient-compressed-stored-fields-with-lucene
>
> In the java-docs, I don't really find any documentation about the
> application of StoredFieldsFormat and CompressingStoredFieldsFormat.

you mean where it is used? Look at the org.apache.lucene.codecs.Codec
class, it has a method:

  public abstract StoredFieldsFormat storedFieldsFormat();

which returns a stored fields format used to encode your stored fields
written by the index writer.
>
> Where can I apply the field compression and provide parameters for the
> compression level?

Look at Lucene41Codec this is where the field format is created. you
can use your own codec (subclass codec) and plug it into the
IndexWriterConfig
to apply your own settings.
>
> The documentation about the 4.0 and 4.1 releases with examples about
> the changes aren't well documented. The wiki seems a little bit
> outdated. For lucene 2 and 3, I have read the Manning-Series Lucene in
> Action that doesn't have any successor so far for the lucene 4
> release.
>
> Does there exist any further documentation, especially with examples
> for the new releases?

I don't think we have examples on the wiki for that stuff but we should I guess.

simon
>
> Regards,
>
>   Bernd
>
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