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https://issues.apache.org/jira/browse/LUCENE-4658?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13604634#comment-13604634
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Robert Muir commented on LUCENE-4658:
-------------------------------------
I don't understand why lucene's facet module would need:
* BinaryDocValues (its the only thing using this, this data type is really
useless otherwise)
* something additional here on this issue.
as far as I'm concerned, one is enough. so if this one is added, please remove
BinaryDocValues.
> Per-segment tracking of external/side-car data
> ----------------------------------------------
>
> Key: LUCENE-4658
> URL: https://issues.apache.org/jira/browse/LUCENE-4658
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Attachments: LUCENE-4658.patch, LUCENE-4658.patch
>
>
> Spinoff from David's idea on LUCENE-4258
> (https://issues.apache.org/jira/browse/LUCENE-4258?focusedCommentId=13534352&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13534352
> )
> I made a prototype patch that allows custom per-segment "side-car
> data". It adds an abstract ExternalSegmentData class. The idea is
> the app implements this, and IndexWriter will pass each Document
> through to it, and call on it to do flushing/merging. I added a
> setter to IndexWriterConfig to enable it, but I think this would
> really belong in Codec ...
> I haven't tackled the read-side yet, though this is already usable
> without that (ie, the app can just open its own files, read them,
> etc.).
> The random test case passes.
> I think for example this might make it easier for Solr/ElasticSearch
> to implement things like ExternalFileField.
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