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https://issues.apache.org/jira/browse/SOLR-1969?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12994659#comment-12994659
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Bill Bell commented on SOLR-1969:
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+1 vote.
> Make MMapDirectory configurable in solrconfig.xml
> -------------------------------------------------
>
> Key: SOLR-1969
> URL: https://issues.apache.org/jira/browse/SOLR-1969
> Project: Solr
> Issue Type: Improvement
> Components: search
> Affects Versions: 1.4
> Reporter: Stephen Bochinski
> Attachments: mmap_upd.patch, mmap_upd.patch, mmap_upd.txt,
> mmap_upd.txt
>
> Original Estimate: 102.5h
> Remaining Estimate: 102.5h
>
> 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>
> </lst>
> </directoryFactory>
> This would enable unmapping of closed files and would not memory map files
> ending with .fdt and .fdx.
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