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From "Aaron McCurry (JIRA)" <j...@apache.org>
Subject [jira] Updated: (LUCENE-2205) Rework of the TermInfosReader class to remove the Terms[], TermInfos[], and the index pointer long[] to be more memory efficient.
Date Wed, 13 Jan 2010 08:30:54 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-2205?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Aaron McCurry updated LUCENE-2205:
----------------------------------

    Attachment: patch-final.txt

All unit tests passed.

> Rework of the TermInfosReader class to remove the Terms[], TermInfos[], and the index
pointer long[] to be more memory efficient.
> ---------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: LUCENE-2205
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2205
>             Project: Lucene - Java
>          Issue Type: Improvement
>         Environment: Java5
>            Reporter: Aaron McCurry
>         Attachments: patch-final.txt
>
>
> Basically packing those three arrays into a byte array with an int array as an index
offset.  
> The performance benefits are stagering on my test index (of size 6.2 GB, with ~1,000,000
documents and ~175,000,000 terms), the memory needed to load the terminfos into memory were
reduced to 17% of there original size.  From 291.5 MB to 49.7 MB.  The random access speed
has been made better by 1-2%, load time of the segments are ~40% faster as well, and full
GC's on my JVM were made 7 times faster.
> I have already performed the work and am offering this code as a patch.  Currently all
test in the trunk pass with this new code enabled.  I did write a system property switch to
allow for the original implementation to be used as well.
> -Dorg.apache.lucene.index.TermInfosReader=default or small
> I have also written a blog about this patch here is the link.

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