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https://issues.apache.org/jira/browse/LUCENE-2431?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Karthick Sankarachary updated LUCENE-2431:
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Attachment: LUCENE-2431.patch
> A Real-Time Split Policy For Searching In Real-Time
> ---------------------------------------------------
>
> Key: LUCENE-2431
> URL: https://issues.apache.org/jira/browse/LUCENE-2431
> Project: Lucene - Java
> Issue Type: New Feature
> Components: Index
> Affects Versions: 3.0.1
> Reporter: Karthick Sankarachary
> Attachments: LUCENE-2431.patch
>
>
> (Please note that the feature described in LUCENE-2425 is required reading
> for this issue.)
> The real-time policy makes it possible to search and read from a (Lucene)
> split index in a real-time manner. Specifically, changes made to the split
> writer will immediately be reflected in all readers that were obtained from
> it.
>
> Note that, while the readers based on this policy are real-time, in order to
> truly achieve real-time searching, one must use a real time searcher, which
> in turn builds on the index searcher (see attached test cases for more
> details).
>
> Now, we describe how this policy overcomes the near-real time limitation of
> current indices. For every reader, it creates a split in the form of a
> RAM-based directory, which serves to track changes made to the split index in
> between the time that and the next reader was obtained. When a new reader is
> obtained, the corresponding split is dynamically added to that reader, and
> all the readers that came before it. Note that a reader does not need to (nor
> does it) see the splits that came before it, since the snapshot of the
> super-reader that it obtains is current at the time of its inception.
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