Hey Bernd, On Mon, Jan 3, 2011 at 1:35 PM, Bernd Fehling <bernd.fehl...@uni-bielefeld.de> wrote: > Dear list, > > some questions about the names of the index files. > With an older Lucene/Solr 4.x version from trunk my index looks like: > _2t1.fdt > _2t1.fdx > _2t1.fnm > _2t1.frq > _2t1.nrm > _2t1.prx > _2t1.tii > _2t1.tis > segments_2 > segments.gen > > With a most recent version from trunk it looks like: > _3a9.fdt > _3a9.fdx > _3a9.fnm > _3a9_0.frq > _3a9.nrm > _3a9_0.prx > _3a9_0.tii > _3a9_0.tis > segments_4 > segments.gen > > Why is there an "_0" at some files? > Is it from Lucene or from Solr or a fault in my system?
lucene 4.0 as you might know has the ability to plug in a Codec which has full control over how postings are stored, which format is used and what files are written. Each Field within a segment can have its own codec ie. field "foo" can have "Standard" and Field "bar" uses "Pulsing" for instance. In such a case, since Pulsing is just a wrapper around Standard - Codec, both codecs try to write the same set of files per segment. For that reason we introduced a codec ID valid per segment. Its is really an ordinal build from the set of codecs used per segment. this ordinal is used to build the filenames, in your case you only have one codec (I suppose its Standard - Codec) with the ord "0". This ordinal is used for all files that codec writes. The files without that ordinal (nrm, fdt, fdx and fnrm) are written by the IndexWriter directly but the functionality behind it might be exposed via codec sooner or later. So, afterall this is a lucene functionality and your system is just fine doing the right thing! > > I also didn't find any information at > http://lucene.apache.org/java/3_0_3/fileformats.html Its not a 3.3 feature - codecs are introduced in 4.0 aka. trunk. simon > > Both indexes are optimized, any idea? > > Regards, Bernd > > --------------------------------------------------------------------- > To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org > For additional commands, e-mail: java-user-h...@lucene.apache.org > > --------------------------------------------------------------------- To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org For additional commands, e-mail: java-user-h...@lucene.apache.org
