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From "Stephen Bochinski (JIRA)" <>
Subject [jira] Created: (SOLR-1969) Make MMapDirectory configurable in solrconfig.xml
Date Tue, 22 Jun 2010 22:07:49 GMT
Make MMapDirectory configurable in solrconfig.xml

                 Key: SOLR-1969
             Project: Solr
          Issue Type: Improvement
          Components: search
    Affects Versions: 1.4
            Reporter: Stephen Bochinski

This will make it so you can enable mmapdirectory from the solrconfig.xml file. There are
also several configurations you can specify in the solrconfig.xml file. You can enable or
disable the unmapping files which have been closed by solr. This is almost necessary for an
index which is being optimized. You also have the option to not mmap certain files. In this
case, FSDirectory will be used to manage those particular files. This is particularly useful
if you are using FieldCache (SOLR-1961). Having this enabled makes it useless to memory map
the .fdt and .fdx files, considering they are already in memory.

The configurations are specified as follows:

<directoryFactory class="solr.MMapDirectoryFactory">
    <str name="unmap">true</str>
    <lst name="filetypes">
      <bool name="fdt">false</bool>
      <bool name="fdx">false</bool>

This would enable unmapping of closed files and would not memory map files ending with .fdt
and .fdx.

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