http://lucene.apache.org/java/3_0_2/fileformats.html (and other versions) contains the explanation of what the file formats are and the naming conventions. Since you are on trunk, you will need to get the docs for that particular version of Lucene and take a look in them.
-Grant On Jan 3, 2011, at 2:55 AM, Bernd Fehling wrote: > Dear list, > > some questions about the names of the index files. > With an older 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? > > Both indexes are optimized, any idea? > > Regards, Bernd -------------------------- Grant Ingersoll http://www.lucidimagination.com