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From "Robert Muir (JIRA)" <>
Subject [jira] Commented: (LUCENE-2252) stored field retrieve slow
Date Sun, 07 Feb 2010 03:28:27 GMT


Robert Muir commented on LUCENE-2252:

bq. as stated earlier, assuming we are not storing 2GB of data per doc, you don't need to
keep a long per doc.

right, you stated this, but even if your 'store long into an int' works, I still think 4 bytes/doc
is too much (its too much wasted ram for virtually no gain)

I dont understand why you need something like a custom segment file to do this, why cant you
just simply use Directory to load this particular file into memory for your use case?

> stored field retrieve slow
> --------------------------
>                 Key: LUCENE-2252
>                 URL:
>             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

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