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From "Uwe Schindler (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-2252) stored field retrieve slow
Date Sat, 06 Feb 2010 22:17:28 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2252?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12830582#action_12830582
] 

Uwe Schindler commented on LUCENE-2252:
---------------------------------------

FileSwitchDirectory comes into my mind. Just delegate the *.fdx extension into RAMDirectory.
On instantiation of the dir, create the copy during wrapping with FileSwitchDir.

> stored field retrieve slow
> --------------------------
>
>                 Key: LUCENE-2252
>                 URL: https://issues.apache.org/jira/browse/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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