On 10/7/2015 8:48 AM, Eric Torti wrote:
> <directoryFactory
> class="${solr.directoryFactory:solr.StandardDirectoryFactory}"
> name="DirectoryFactory"/>
>
> I'm just starting to grasp different strategies for Directory
> implementation. Can I assume that solr.StandardDirectoryFactory is a
> MMapDirectory as described by Uwe Schindler in this post about the use
> of virtual memory?
> [http://blog.thetaphi.de/2012/07/use-lucenes-mmapdirectory-on-64bit.html]After a look at the code, I found that StandardDirectoryFactory should use MMap if the OS and Java version support it. If support isn't there, it will use conventional file access methods. As far as I know, all 64-bit Java versions and 64-bit operating systems will support MMap. The factory you *should* be using is NRTCachingDirectoryFactory, and you should enable the updateLog to ensure data reliability. Thanks, Shawn
