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From "Karthick Sankarachary (JIRA)" <j...@apache.org>
Subject [jira] Created: (LUCENE-2430) An Archiving Split Policy For Managing Past-Their-Prime Non-Searchable Documents
Date Sun, 02 May 2010 16:18:56 GMT
An Archiving Split Policy For Managing Past-Their-Prime Non-Searchable Documents
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                 Key: LUCENE-2430
                 URL: https://issues.apache.org/jira/browse/LUCENE-2430
             Project: Lucene - Java
          Issue Type: New Feature
            Reporter: Karthick Sankarachary


(Please note that the feature described in LUCENE-2425 is required reading for this issue.)


The archiving split policy extends the rotating split policy by archiving sub-indices over-flowing
from the split index. This allows for older documents in the index to be available outside
the context of the split index, even if they are no longer visible therein. 

It does so by overriding the RotatingSplitPolicy#maybeExpungeOldestSplit method. In particular,
it archives (i.e., makes a copy of) the last sub-index (about to be expunged), just before
the rotating policy actually expunges it.

Just like the rotating split policy constrains the number of sub-indices, the archiving split
policy too puts a limit on the number of sub-archives (i.e. sub-indices that have been archived
and expunged) that the split index will maintain at any given point in time.

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