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From "Karthick Sankarachary (JIRA)" <j...@apache.org>
Subject [jira] Created: (LUCENE-2431) A Real-Time Split Policy For Searching In Real-Time
Date Sun, 02 May 2010 16:32:55 GMT
A Real-Time Split Policy For Searching In Real-Time
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                 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


(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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