If you want to try MMapDirectory with Solr 1.4, then copy the class org.apache.solr.core.MMapDirectoryFactory from 3.x or Trunk, and either add it to the .war file (you can just add it under "src/java" and re-package the war), or you can put it in its own .jar file in the "lib" directory under "solr_home". Then, in solrconfig.xml, add this entry under the root "config" element:
<directoryFactory class="org.apache.solr.core.MMapDirectoryFactory" /> I'm not sure if MMapDirectory will perform better for you with Linux over NIOFSDir. I'm pretty sure in Trunk/4.0 it's the default for Windows and maybe Solaris. In Windows, there is a definite advantage for using MMapDirectory on a 64-bit system. James Dyer E-Commerce Systems Ingram Content Group (615) 213-4311 -----Original Message----- From: Li Li [mailto:fancye...@gmail.com] Sent: Monday, August 08, 2011 4:09 AM To: solr-user@lucene.apache.org Subject: how to enable MMapDirectory in solr 1.4? hi all, I read Apache Solr 3.1 Released Note today and found that MMapDirectory is now the default implementation in 64 bit Systems. I am now using solr 1.4 with 64-bit jvm in Linux. how can I use MMapDirectory? will it improve performance?
