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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-1382) Allow storing user data when IndexWriter.commit() is called
Date Fri, 12 Sep 2008 17:23:44 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1382?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12630629#action_12630629
] 

Michael McCandless commented on LUCENE-1382:
--------------------------------------------

It seems like there is a place for both approaches, since they have different tradeoffs?

I plan to add a static IndexReader method, much like eg getVersion, that lets you retrieve
the commitUserData of the current segments_N file.  So, you're right, this enables fast checking
of the latest commitUserData in the index.

I was thinking it's a single String, and if you set it (by calling commit(commitUserData)),
and the commit completes successfully, it overwrites whatever was there, previously.

> Allow storing user data when IndexWriter.commit() is called
> -----------------------------------------------------------
>
>                 Key: LUCENE-1382
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1382
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Index
>            Reporter: Michael McCandless
>            Assignee: Michael McCandless
>            Priority: Minor
>
> Spinoff from here:
>     http://www.mail-archive.com/java-user@lucene.apache.org/msg22303.html
> The idea is to allow optionally passing an opaque String commitUserData to the IndexWriter.commit
method.  This String would be stored in the segments_N file, and would be retrievable by an
IndexReader.  Applications could then use this to assign meaning to each commit.
> It would be nice to get this done for 2.4, but I don't think we should hold the release
for it.

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