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https://issues.apache.org/jira/browse/LUCENE-5419?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13885217#comment-13885217
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Michael McCandless commented on LUCENE-5419:
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This may be a duplicate of LUCENE-2082?
> Implement Codec for bulk copying of postings
> --------------------------------------------
>
> Key: LUCENE-5419
> URL: https://issues.apache.org/jira/browse/LUCENE-5419
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/codecs, core/index, core/store
> Reporter: Otis Gospodnetic
>
> Based on [~mikemccand]'s suggestion:
> {quote}
> We have no codec that implements bulk merging for postings, which
> would be interesting to pursue: in the append-only case it's possible,
> and merging of postings is normally by far the most time consuming
> step of a merge.
> {quote}
> Source: http://search-lucene.com/m/Kw9ZhaUjhA
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