Rework of the TermInfosReader class to remove the Terms[], TermInfos[], and the
index pointer long[] to be more memory efficient.
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Key: LUCENE-2205
URL: https://issues.apache.org/jira/browse/LUCENE-2205
Project: Lucene - Java
Issue Type: Improvement
Environment: Java5
Reporter: Aaron McCurry
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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