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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