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From "Michael Busch (JIRA)" <>
Subject [jira] Commented: (LUCENE-1879) Parallel incremental indexing
Date Fri, 09 Apr 2010 12:59:51 GMT


Michael Busch commented on LUCENE-1879:

I'll start by describing the limitations of the current design (whether its the approach or
the code is debatable):

FWIW:  The attached code and approach was never meant to be committed.  I attached it for
legal reasons, as it contains the IP that IBM donated to Apache via the software grant.  Apache
requires to attach the code that is covered by such a grant.

I wouldn't want the master/slave approach in Lucene core.  You can implement it much nicer
*inside* of Lucene.  The attached code however was developed with the requirement of having
to run on top of an unmodified Lucene version.  

I've realized this when I found that if tests (in this patch) are run with "-ea", there are
many assert exceptions that are printed from IndexWriter.startCommit.

The code runs without exceptions with Lucene 2.4.  It doesn't work with 2.9/3.0, but you'll
find an upgraded version that works with 3.0 within IBM, Shai.

> Parallel incremental indexing
> -----------------------------
>                 Key: LUCENE-1879
>                 URL:
>             Project: Lucene - Java
>          Issue Type: New Feature
>          Components: Index
>            Reporter: Michael Busch
>            Assignee: Michael Busch
>             Fix For: 3.1
>         Attachments: parallel_incremental_indexing.tar
> A new feature that allows building parallel indexes and keeping them in sync on a docID
level, independent of the choice of the MergePolicy/MergeScheduler.
> Find details on the wiki page for this feature:
> Discussion on java-dev:

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