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From "Uwe Schindler (JIRA)" <j...@apache.org>
Subject [jira] Commented: (SOLR-1969) Make MMapDirectory configurable in solrconfig.xml
Date Tue, 22 Jun 2010 22:31:50 GMT

    [ https://issues.apache.org/jira/browse/SOLR-1969?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12881418#action_12881418
] 

Uwe Schindler commented on SOLR-1969:
-------------------------------------

Instead of the Set/List fileTypes, wrap a FileSwitchDirectory around the MMapDirectory, so
there are no changes needed in MMapDirectory. This is cleaner than hacking MMapDirectory to
create FSDirIndexInputs.

> 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.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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