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https://issues.apache.org/jira/browse/LUCENE-8321?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16480479#comment-16480479
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Robert Muir commented on LUCENE-8321:
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I have thought about this, I am personally against the idea because we won't be
able to merge segments that large, hence creating a really big trap.
> Allow composite readers to have more than 2B documents
> ------------------------------------------------------
>
> Key: LUCENE-8321
> URL: https://issues.apache.org/jira/browse/LUCENE-8321
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Priority: Minor
>
> I would like to start discussing removing the limit of ~2B documents that we
> have for indices, while still enforcing it at the segment level for practical
> reasons.
> Postings, stored fields, and all other codec APIs would keep working on
> integers to represent doc ids. Only top-level doc ids and numbers of
> documents would need to move to a long. I say "only" because we now mostly
> consume indices per-segment, but there is still a number of places where we
> identify documents by their top-level doc ID like {{IndexReader#document}},
> top-docs collectors, etc.
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