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Posted to dev@lucene.apache.org by "Karthick Sankarachary (JIRA)" <ji...@apache.org> on 2010/05/02 18:34:55 UTC
[jira] Updated: (LUCENE-2431) A Real-Time Split Policy For
Searching In Real-Time
[ https://issues.apache.org/jira/browse/LUCENE-2431?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Karthick Sankarachary updated LUCENE-2431:
------------------------------------------
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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