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https://issues.apache.org/jira/browse/LUCENE-3573?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13150279#comment-13150279
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Doron Cohen commented on LUCENE-3573:
-------------------------------------

bq. So in fact, let's not call it openIfChanged, because may not be meaningful.

Yes this bothered me too. 

bq. so maybe refreshIfChanged?

... let's stick to refresh() (but...)

Current refresh impl is efficient in that (1) arrays only grow if needed (2) 
caches only cleaned from wrong 'invalid ordinals'. In that, it relies on that 
the taxonomy can only grow (unless it is recreated, hence this issue).

So I now think it would be best to modify slightly refresh() - in case it 
detects that the taxonomy was created, it will throw a new (checked) exception 
- telling the application that this TR cannot be refreshed but the app can open 
a new TR.

This way there is no 3-way logic - either the TR was refreshed or it was not.

And while we are at this, refresh() is void. I think it would be useful to 
return boolean, indicating whether any refresh took place.
                
> TaxonomyReader.refresh() is broken, replace its logic with reopen(), 
> following IR.reopen pattern
> ------------------------------------------------------------------------------------------------
>
>                 Key: LUCENE-3573
>                 URL: https://issues.apache.org/jira/browse/LUCENE-3573
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: modules/facet
>            Reporter: Doron Cohen
>            Assignee: Doron Cohen
>            Priority: Minor
>         Attachments: LUCENE-3573.patch
>
>
> When recreating the taxonomy index, TR's assumption that categories are only 
> added does not hold anymore.
> As result, calling TR.refresh() will be incorrect at best, but usually throw 
> an AIOOBE.

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