Allow changing of ZIP compression level for compressed fields
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Key: LUCENE-648
URL: http://issues.apache.org/jira/browse/LUCENE-648
Project: Lucene - Java
Issue Type: Improvement
Components: Index
Affects Versions: 2.0.0, 1.9, 2.0.1, 2.1
Reporter: Michael McCandless
Priority: Minor
In response to this thread:
http://www.gossamer-threads.com/lists/lucene/java-user/38810
I think we should allow changing the compression level used in the call to
java.util.zip.Deflator in FieldsWriter.java. Right now it's hardwired to
"best":
compressor.setLevel(Deflater.BEST_COMPRESSION);
Unfortunately, this can apparently cause the zip library to take a very long
time (10 minutes for 4.5 MB in the above thread) and so people may want to
change this setting.
One approach would be to read the default from a Java system property, but, it
seems recently (pre 2.0 I think) there was an effort to not rely on Java System
properties (many were removed).
A second approach would be to add static methods (and static class attr) to
globally set the compression level?
A third method would be in document.Field class, eg a
setCompressLevel/getCompressLevel? But then every time a document is created
with this field you'd have to call setCompressLevel since Lucene doesn't have a
global Field schema (like Solr).
Any other ideas / prefererences for either of these methods?
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