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From "Karthick Sankarachary (JIRA)" <>
Subject [jira] Updated: (LUCENE-2431) A Real-Time Split Policy For Searching In Real-Time
Date Sun, 02 May 2010 16:34:55 GMT


Karthick Sankarachary updated LUCENE-2431:

    Attachment: LUCENE-2431.patch

> A Real-Time Split Policy For Searching In Real-Time
> ---------------------------------------------------
>                 Key: LUCENE-2431
>                 URL:
>             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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