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https://issues.apache.org/jira/browse/LUCENE-2025?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Simon Willnauer updated LUCENE-2025:
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Labels: gsoc2011, lucene-gsoc-11 mentor, (was: 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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