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From "John Wang (JIRA)" <>
Subject [jira] Created: (LUCENE-2252) stored field retrieve slow
Date Sat, 06 Feb 2010 20:18:28 GMT
stored field retrieve slow

                 Key: LUCENE-2252
             Project: Lucene - Java
          Issue Type: Improvement
          Components: Store
    Affects Versions: 3.0
            Reporter: John Wang

IndexReader.document() on a stored field is rather slow. Did a simple multi-threaded test
and profiled it:

40+% time is spent in getting the offset from the index file
30+% time is spent in reading the count (e.g. number of fields to load)

Although I ran it on my lap top where the disk isn't that great, but still seems to be much
room in improvement, e.g. load field index file into memory (for a 5M doc index, the extra
memory footprint is 20MB, peanuts comparing to other stuff being loaded)

A related note, are there plans to have custom segments as part of flexible indexing feature?

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