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Posted to dev@lucene.apache.org by "Michael McCandless (Resolved) (JIRA)" <ji...@apache.org> on 2011/10/27 22:48:33 UTC
[jira] [Resolved] (LUCENE-2205) Rework of the TermInfosReader class
to remove the Terms[], TermInfos[], and the index pointer long[] and create
a more memory efficient data structure.
[ https://issues.apache.org/jira/browse/LUCENE-2205?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Michael McCandless resolved LUCENE-2205.
----------------------------------------
Resolution: Fixed
Fix Version/s: 4.0
Finally resolved; thanks Aaron!
> Rework of the TermInfosReader class to remove the Terms[], TermInfos[], and the index pointer long[] and create a more memory efficient data structure.
> -------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: LUCENE-2205
> URL: https://issues.apache.org/jira/browse/LUCENE-2205
> Project: Lucene - Java
> Issue Type: Improvement
> Components: core/index
> Environment: Java5
> Reporter: Aaron McCurry
> Assignee: Michael McCandless
> Fix For: 3.5, 4.0
>
> Attachments: LUCENE-2205.patch, LUCENE-2205.patch, RandomAccessTest.java, TermInfosReader.java, TermInfosReaderIndex.java, TermInfosReaderIndexDefault.java, TermInfosReaderIndexSmall.java, lowmemory_w_utf8_encoding.patch, lowmemory_w_utf8_encoding.v4.patch, patch-final.txt, rawoutput.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.
> http://www.nearinfinity.com/blogs/aaron_mccurry/my_first_lucene_patch.html
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