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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] [Created] (LUCENE-3214) Ability to mlock certain fields from the terms dict
Date Sat, 18 Jun 2011 16:23:47 GMT
Ability to mlock certain fields from the terms dict
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                 Key: LUCENE-3214
                 URL: https://issues.apache.org/jira/browse/LUCENE-3214
             Project: Lucene - Java
          Issue Type: Improvement
            Reporter: Michael McCandless


This is a hacked up prototype!  It works but I'm not sure how to get this to a committable
point.

The patch invokes mlock() (tested only on Linux), locking pages from the terms dictionary
file that hold terms for a specified field.  You can only do this with MMapDirectory.

I used this to lock pages for the "id" field in the NRT stress test; it's an alternative to
MemoryCodec.  But, it requires you set up the OS to allow the app/user to lock pages in RAM.

It works very well in reducing the NRT reopen latency even when large merges are running...

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