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https://issues.apache.org/jira/browse/LUCENE-3441?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13500953#comment-13500953
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Sivan Yogev commented on LUCENE-3441:
-------------------------------------

Went through the patch and it looks good. 

One symmetry question I have - TR is now abstract class and TW still interface. 
Can it be that we should make TW also abstract class?

A few minor comments:

ParentArray: 
* constructors are public but have no Javadoc. Are they meant for external 
(outside the taxonomy package) usage? 

DTR: 
* Semi-cosmetic issue - I would move the first (non-public) constructor after 
the two public ones, confused me a bit to see that one first. 
* Line 127: unnecessary "to" in Javadoc of param directory.
* 4000 appears 4 times in the code, would rather have it once as a constant.

                
> Add NRT support to LuceneTaxonomyReader
> ---------------------------------------
>
>                 Key: LUCENE-3441
>                 URL: https://issues.apache.org/jira/browse/LUCENE-3441
>             Project: Lucene - Core
>          Issue Type: New Feature
>          Components: modules/facet
>            Reporter: Shai Erera
>            Assignee: Shai Erera
>            Priority: Minor
>         Attachments: LUCENE-3441.patch
>
>
> Currently LuceneTaxonomyReader does not support NRT - i.e., on changes to 
> LuceneTaxonomyWriter, you cannot have the reader updated, like 
> IndexReader/Writer. In order to do that we need to do the following:
> # Add ctor to LuceneTaxonomyReader to allow you to instantiate it with 
> LuceneTaxonomyWriter.
> # Add API to LuceneTaxonomyWriter to expose its internal IndexReader
> # Change LTR.refresh() to return an LTR, rather than void. This is actually 
> not strictly related to that issue, but since we'll need to modify refresh() 
> impl, I think it'll be good to change its API as well. Since all of facet API 
> is @lucene.experimental, no backwards issues here (and the sooner we do it, 
> the better).

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