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https://issues.apache.org/jira/browse/LUCENE-6840?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Adrien Grand updated LUCENE-6840:
---------------------------------
    Attachment: LUCENE-6840.patch

Here is a patch that makes this a new DocValuesFormat, with a new associated 
Codec and moves Lucene53Codec and Lucene50DocValuesFormat to 
lucene/backward-codecs. I would like to commit soon if there are no objections.

> Put ord indexes of doc values on disk
> -------------------------------------
>
>                 Key: LUCENE-6840
>                 URL: https://issues.apache.org/jira/browse/LUCENE-6840
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Adrien Grand
>            Assignee: Adrien Grand
>            Priority: Minor
>         Attachments: LUCENE-6840.patch, LUCENE-6840.patch, LUCENE-6840.patch
>
>
> Currently we still load monotonic blocks into memory to map doc ids to an 
> offset on disk. Since these data structures are usually consumed sequentially 
> I would like to investigate putting them to disk.



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