: I have a core with 120+ segment files and I tried partial optimize specify : maxNumSegments=10, after the optimize the segment files reduced to 64 files;
a) the option you want to specify is "maxSegments" .. not "maxNumSegments" http://wiki.apache.org/solr/UpdateXmlMessages#Optional_attributes_for_.22optimize.22 b) i can't reproduce this ... i just created an index with 200 segments and when i hit the example url from the wiki... curl 'http://localhost:8983/solr/update?optimize=true&maxSegments=10&waitFlush=false' ...my index was correctly optimized down to 10 segments. is it possible that you just didn't wait long enough and you were observing the number of segments while the optimize was still taking place? -Hoss
