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From "Earwin Burrfoot (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-2386) IndexWriter commits unnecessarily on fresh Directory
Date Mon, 12 Apr 2010 09:21:40 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2386?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12855899#action_12855899
] 

Earwin Burrfoot commented on LUCENE-2386:
-----------------------------------------

bq. The point here was that we should not create a commit unless the user has specifically
asked for it.
Isn't opening IW with CREATE* mode called "specifically asking for"?
If he doesn't need this functionality, he uses another mode, that simple.

bq. But if the app called new IW, add docs and crashed in the middle, the Directory will still
remain empty ... which is sort of what, IMO, should happen.
Why so? Please, read my reference to version control systems and databases - they all leave
behind an initialized database if the first commit fails.

My point is that the feature is immediately usable and saves people from writing (possibly
buggy) emptiness-detection-then-commit code over and over again.

> IndexWriter commits unnecessarily on fresh Directory
> ----------------------------------------------------
>
>                 Key: LUCENE-2386
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2386
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: Index
>            Reporter: Shai Erera
>            Assignee: Shai Erera
>             Fix For: 3.1
>
>         Attachments: LUCENE-2386.patch, LUCENE-2386.patch, LUCENE-2386.patch, LUCENE-2386.patch,
LUCENE-2386.patch
>
>
> I've noticed IndexWriter's ctor commits a first commit (empty one) if a fresh Directory
is passed, w/ OpenMode.CREATE or CREATE_OR_APPEND. This seems unnecessarily, and kind of brings
back an autoCommit mode, in a strange way ... why do we need that commit? Do we really expect
people to open an IndexReader on an empty Directory which they just passed to an IW w/ create=true?
If they want, they can simply call commit() right away on the IW they created.
> I ran into this when writing a test which committed N times, then compared the number
of commits (via IndexReader.listCommits) and was surprised to see N+1 commits.
> Tried to change doCommit to false in IW ctor, but it got IndexFileDeleter jumping on
me .. so the change might not be that simple. But I think it's manageable, so I'll try to
attack it (and IFD specifically !) back :).

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