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https://issues.apache.org/jira/browse/MAHOUT-459?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12913149#action_12913149
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Drew Farris commented on MAHOUT-459:
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I suspect Lucene 4.x releases are a bit far off at this point, but would
appreciate being corrected. I'm also curious whether Lucene-4.0-dev jars could
be used to read indexes created with Lucene 3.x
My gut would be to punt on this for 0.4, but the patch may be handy when we
decide to itegrate with the 4.0 api.
> Reading an Index from Lucene/Solr 4.0-dev
> -----------------------------------------
>
> Key: MAHOUT-459
> URL: https://issues.apache.org/jira/browse/MAHOUT-459
> Project: Mahout
> Issue Type: Improvement
> Components: Utils
> Affects Versions: 0.4
> Environment: Windows Server 2008 R2 Standard, Cygwin, Solr-trunk,
> Mahout-trunk
> Reporter: Stephen McGill
> Priority: Minor
> Fix For: 0.4
>
> Attachments: Mahout-Importing-Vectors-Lucene-Solr-4-dev.diff
>
>
> It is not possible to read indexes created by Lucene/Solr 4.0-dev (the trunk
> development) with the Lucene libraries that are included with Mahout-dev.
> When adding the new Lucene/Solr 4.0-dev, there are API changes that do not
> allow Mahout to compile.
> By adapting mahout-utils to fit Lucene/Solr 4.0-dev's API changes, it is
> possible to read its index.
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