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https://issues.apache.org/jira/browse/SOLR-434?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12550835
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Yonik Seeley commented on SOLR-434:
-----------------------------------

Note: this doesn't really apply to single instances of Solr/Lucene... 2B ids 
will be fine for quite some time.
However, distributed search can push over that limit, and we should prepare for 
it.

- SolrJ's SolrDocumentList should have numFound and start be a longs
- how to handle these numbers in the XML format (change to long at some 
point... bump version?).  These don't present a problem in JSON/Python since 
integers don't have limits.
- same issue with facet counts... should they be defined to be <int> unless 
individual values are large enough to overflow, or should we just change them 
to long in SolrJ and the XML?


> interfaces should support >2B docs
> ----------------------------------
>
>                 Key: SOLR-434
>                 URL: https://issues.apache.org/jira/browse/SOLR-434
>             Project: Solr
>          Issue Type: Improvement
>            Reporter: Yonik Seeley
>            Priority: Minor
>
> External interfaces that deal with numbers of documents should eventually be 
> able to deal with > 2B documents (that means long instead of int).

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