On Fri, Feb 19, 2016 at 8:51 AM, Adam Neal [Extranet] <an...@mass.co.uk> wrote: > I've recently upgraded from 4.10.2 to 5.3.1 and I've hit an issue with slow > commits on one of my cores. The core in question is relatively small (56k > docs) and the issue only shows when commiting after a number of deletes, > commiting after additions is fine. As an example commiting after deleting > approximately 10% of the documents takes around 25mins. The same test on the > 4.10.2 instance takes around 1 second. > > I have done some investigation and the problem appears to be caused by having > dynamic fields, the core in question has a large number, performing the same > operation on this core with the dynamic fields removed sees a big improvement > on the performance with the commit taking 11 seconds (still not quite on a > par with 4.10.2).
Dynamic fields is a Solr schema concept, and does not translate to any differences in Lucene. You may be hitting something due to a large number of fields (at the lucene level, each field name is a different field). How many different fields (i.e. fieldnames) do you have across the entire index? -Yonik
