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From "Michael McCandless (JIRA)" <>
Subject [jira] Commented: (LUCENE-1637) Getting an IndexReader from a committed IndexWriter
Date Thu, 21 May 2009 17:17:45 GMT


Michael McCandless commented on LUCENE-1637:

Couldn't you simply call IW.getReader() just after calling IW.commit()?

Or just IndexReader.reopen?  (The extra work that reopen does vs IndexWriter.getReader is
fairly minor -- the former must find & open the segments_N file; after that it's the same).

> Getting an IndexReader from a committed IndexWriter
> ---------------------------------------------------
>                 Key: LUCENE-1637
>                 URL:
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Index
>    Affects Versions: 2.9
>            Reporter: Shay Banon
> I just had a look at the job done in IndexWriter in order to get an IndexReader with
all the current ongoing changes done using the IndexWriter. This feature is very useful, and
I was wondering if another feature, which (I think) is simple to implement (compared to the
previous one) might make sense. 
>    Many times, an application opens an IndexWriter, does whatever changes it does, and
then commits the changes. It would be nice to get an IndexReader (read only one is fine) that
corresponds to the committed (or even closed) IndexWriter. This will allow for a cache of
IndexReader that is already used to be updated with a fresh IndexReader, without the need
to reopen one (which should be slower than opening one based on the IndexWriter information).
The main difference is the fact that the mentioned IndexReader could still be reopened without
the need to throw an AlreadyClosedException. 
>    More information can be found here:

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