Lots of data from the index is kept in MMapDirectory space, which is mapped to the OS's memory, see Uwe's excellent explanation here:
http://blog.thetaphi.de/2012/07/use-lucenes-mmapdirectory-on-64bit.html Best, Erick On Thu, Nov 10, 2016 at 2:20 PM, Chetas Joshi <chetas.jo...@gmail.com> wrote: > Hi, > > I have a SolrCloud (Solr 5.5.0) of 50 nodes. The JVM heap memory usage of > my solr shards is never more than 50% of the total heap. However, the hosts > on which my solr shards are deployed often run into 99% swap space issue. > This causes the solr shards go down. Why solr shards are so sensitive to > the swap space usage? The JVM heap is more than enough so the shards should > never require the swap space. What could be the reason? Where can find the > reason why the solr shards go down. I don't see anything on the solr logs. > > Thanks!
