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https://issues.apache.org/jira/browse/LUCENE-5090?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13708626#comment-13708626
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ASF subversion and git services commented on LUCENE-5090:
---------------------------------------------------------

Commit 1503333 from [~mikemccand] in branch 'dev/branches/lucene_solr_4_4'
[ https://svn.apache.org/r1503333 ]

LUCENE-5090: catch mismatched readers in 
SortedSetDocValuesAccumulator/ReaderState
                
> SSDVA should detect a mismatch in the SSDVReaderState
> -----------------------------------------------------
>
>                 Key: LUCENE-5090
>                 URL: https://issues.apache.org/jira/browse/LUCENE-5090
>             Project: Lucene - Core
>          Issue Type: Improvement
>          Components: modules/facet
>            Reporter: Michael McCandless
>            Assignee: Michael McCandless
>             Fix For: 5.0, 4.4
>
>         Attachments: LUCENE-5090.patch, LUCENE-5090.patch
>
>
> This is trappy today: every time you open a new reader, you must create a new 
> SSDVReaderState (this computes the seg -> global ord mapping), and pass that 
> to SSDVA.
> But if this gets messed up (e.g. you pass an old SSDVReaderState) it will 
> result in confusing AIOOBE, or silently invalid results.

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