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https://issues.apache.org/jira/browse/LUCENE-4156?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13397356#comment-13397356
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Sivan Yogev commented on LUCENE-4156:
-------------------------------------

Since getParent() could be heavily used during facets indexing I was thinking 
that reducing the two method calls (one to getParent another for ensureOpen) 
could make a difference, but you are right that it is not safe for future 
implementation details. So best keep the patch as is.
                
> Improve implementation of DirectoryTaxonomyWriter.getSize()
> -----------------------------------------------------------
>
>                 Key: LUCENE-4156
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4156
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: modules/facet
>            Reporter: Sivan Yogev
>            Assignee: Shai Erera
>            Priority: Minor
>         Attachments: LUCENE-4156.patch
>
>
> Current implementation of DirectoryTaxonomyWriter.getSize() is synchrionized 
> and invokes indexWriter.maxDoc(), both harming performance.

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