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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