Mailing-List: contact java-user-help@lucene.apache.org; run by ezmlm
Precedence: bulk
Reply-To: java-user@lucene.apache.org
Received-SPF: pass (nike.apache.org: local policy)
Date: Fri, 29 Feb 2008 19:03:59 -0800 (PST)
From: Tim Brennan <tim@zimbra.com>
To: java-user@lucene.apache.org
Message-ID: <377418724.77401204340639049.JavaMail.root@dogfood.zimbra.com>
In-Reply-To: <1936311142.77311204340164276.JavaMail.root@dogfood.zimbra.com>
Subject: More IndexDeletionPolicy questions
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit

Is there a direct way to ask an IndexReader what segment it is pointing at?  That would make implementing custom deletion policies a LOT easier.

It seems like it should be pretty simple -- keep a list of open IndexReaders, track what Segment files they're pointing to, and in onCommit don't delete those segments.  

Unfortunately it ends up being very difficult to directly determine what Segment an IndexReader is pointing to.  Is there some straightforward way that I'm missing -- all I've managed to do so far is to remember the most recent one from onCommit/onInit and use that one....that works OK, but makes bootstrapping a pain if you try to open a Reader before you've opened the writer once.  

Also, when I use IndexReader.reopen(), can I assume that the newly returned reader is pointing at the "most recent" segment?  I think so...


Here's a sequence of steps that happen in my app:

0) open writer, onInit tells me that seg_1 is the most recent segment

1) Open reader, assume it is pointing to seg_1 from (0)

2) New write commits into seg_2, don't delete seg_1 b/c of (1)

3) Call reader.reopen() on the reader from (1)....new reader is pointing to seg_2 now?

4) seg_1 stays around until the next time I open or commit a writer, then it is removed.


Does that seem reasonable?


--tim


---------------------------------------------------------------------
To unsubscribe, e-mail: java-user-unsubscribe@lucene.apache.org
For additional commands, e-mail: java-user-help@lucene.apache.org