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From "Karthick Sankarachary (JIRA)" <>
Subject [jira] Updated: (LUCENE-2432) A Caching Split Policy For Real-Time Index Caching
Date Sun, 02 May 2010 16:50:55 GMT


Karthick Sankarachary updated LUCENE-2432:

    Attachment: LUCENE-2432.patch

> A Caching Split Policy For Real-Time Index Caching
> --------------------------------------------------
>                 Key: LUCENE-2432
>                 URL:
>             Project: Lucene - Java
>          Issue Type: New Feature
>          Components: contrib/*, Index
>    Affects Versions: 3.0.1
>            Reporter: Karthick Sankarachary
>         Attachments: LUCENE-2432.patch
> (Please note that the feature described in LUCENE-2425 is required reading for this issue.)

> he caching split policy builds on the real-time split policy, providing a caching mechanism
that serves to buffer writes to the split index.
> As one might expect, this policy delays writes to the index, holding them in the RAM-based
splits (created by the real-time policy) instead. When a flush is forced (typically through
a commit, but in general, through a split rule), then all un-flushed changes (splits) are
written to the super-directory.
> There are a couple of reasons why one may wish to use the caching split policy opposed
to a RAMDirectory. The latter is primarily used to "load a disk-based index into memory",
and suffers from a limitation: "the resulting RAMDirectory instance is fully independent from
the original Directory (it is a complete copy).  Any subsequent changes to the  original Directory
will not be visible in the RAMDirectory instance". Furthermore, the RAMDirectory gives little
control over when changes are flushed to the disk. The caching split policy attempts to address
those limitations by allowing (a) changes to the original directory (which we refer to as
the super-directory) are in fact visible to the reader and (b) the user to define exactly
when to flush writes to the underlying directory.

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