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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] Created: (LUCENE-648) Allow changing of ZIP compression level for compressed fields
Date Thu, 10 Aug 2006 15:07:14 GMT
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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