Shai Erera created LUCENE-4061:
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             Summary: Improvements to DirectoryTaxonomyWriter (synchronization 
and others)
                 Key: LUCENE-4061
                 URL: https://issues.apache.org/jira/browse/LUCENE-4061
             Project: Lucene - Java
          Issue Type: Improvement
          Components: modules/facet
            Reporter: Shai Erera
            Assignee: Shai Erera
             Fix For: 4.0


DirTaxoWriter synchronizes in too many places. For instance addCategory() is 
fully synchronized, while only a small part of it needs to be.

Additionally, getCacheMemoryUsage looks bogus - it depends on the type of the 
TaxoWriterCache. No code uses it, so I'd like to remove it -- whoever is 
interested can query the specific cache impl it has. Currently, only 
Cl2oTaxoWriterCache supports it.

If the changes will be simple, I'll port them to 3.6.1 as well.

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