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https://issues.apache.org/jira/browse/LUCENE-2025?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13006506#comment-13006506
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Michael McCandless commented on LUCENE-2025:
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Simon, watch out for INFRA-3517 -- we have to be careful, when labeling, to not
use the label with a trailing comma stuck on!
Ie this issue now has two such labels: 'gosc2011,' and 'mentor,'
> Ability to turn off the store for an index
> ------------------------------------------
>
> Key: LUCENE-2025
> URL: https://issues.apache.org/jira/browse/LUCENE-2025
> Project: Lucene - Java
> Issue Type: New Feature
> Components: Index
> Reporter: Michael Busch
> Assignee: Michael Busch
> Priority: Minor
> Labels: gsoc2011,, lucene-gsoc-11, mentor,
> Fix For: 4.0
>
>
> It would be really good in combination with parallel indexing if the
> Lucene store could be turned off entirely for an index.
> The reason is that part of the store is the FieldIndex (.fdx file),
> which contains an 8 bytes pointer for each document in a segment, even
> if a document does not contain any stored fields.
> With parallel indexing we will want to rewrite certain parallel
> indexes to update them, and if such an update affects only a small
> number of documents it will be a waste if you have to write the .fdx
> file every time.
> So in the case where you only want to update a data structure in the
> inverted index it makes sense to separate your index into multiple
> parallel indexes, where the ones you want to update don't contain any
> stored fields.
> It'd be also great to not only allow turning off the store but to make
> it customizable, similarly to what flexible indexing wants to achieve
> regarding the inverted index.
> As a start I'd be happy with the ability to simply turn off the store and to
> add more flexibility later.
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