You're really looking at this backwards. The MMapDirectory stuff is for Solr (Lucene, really) _reading_ data from closed segment files.
When indexing, there are internal memory structures that are flushed to disk on commit, but these have nothing to do with MMapDirectory. So the question is really moot ;) Best, Erick On Mon, Oct 26, 2015 at 5:47 PM, Rallavagu <rallav...@gmail.com> wrote: > All, > > Are memory mapped files (mmap) flushed to disk during "hard commit"? If yes, > should we disable OS level (Linux for example) memory mapped flush? > > I am referring to following for mmap files for Lucene/Solr > > http://blog.thetaphi.de/2012/07/use-lucenes-mmapdirectory-on-64bit.html > > Linux level flush > > http://www.cyberciti.biz/faq/linux-stop-flushing-of-mmaped-pages-to-disk/ > > Solr's hard and soft commit > > https://lucidworks.com/blog/2013/08/23/understanding-transaction-logs-softcommit-and-commit-in-sorlcloud/ > > Thanks in advance.
