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From "Eks Dev (JIRA)" <>
Subject [jira] Commented: (LUCENE-1219) support array/offset/ length setters for Field with binary data
Date Tue, 19 Aug 2008 07:51:45 GMT


Eks Dev commented on LUCENE-1219:

bq. did you ever measure the before/after performance difference?

sure we did, it's been a while we measured it so I do not have the real numbers at hand. But
for both cases (indexing and fetching stored binary field)  it showed up during profiling
as the only easy quick-win(s) we could make . 

We index very short documents and indexing speed  per thread before this patch was is in 
7.5k documents/ second range, after it we run it with the patch over 9.5-10K/Second, sweet...

for searching, I do not not remember the numbers, but it was surely above 5% range  (try to
allocate 12Mb in 6k objects per second as unnecessary addition and you will see it  :)

> support array/offset/ length setters for Field with binary data
> ---------------------------------------------------------------
>                 Key: LUCENE-1219
>                 URL:
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Index
>            Reporter: Eks Dev
>            Assignee: Michael McCandless
>            Priority: Minor
>             Fix For: 2.4
>         Attachments: LUCENE-1219.extended.patch, LUCENE-1219.extended.patch, LUCENE-1219.patch,
LUCENE-1219.patch, LUCENE-1219.patch, LUCENE-1219.patch, LUCENE-1219.take2.patch, LUCENE-1219.take3.patch
> currently Field/Fieldable interface supports only compact, zero based byte arrays. This
forces end users to create and copy content of new objects before passing them to Lucene as
such fields are often of variable size. Depending on use case, this can bring far from negligible
 performance  improvement. 
> this approach extends Fieldable interface with 3 new methods   
> getOffset(); gettLenght(); and getBinaryValue() (this only returns reference to the array)

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