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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 12:04:41 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2386?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12855937#action_12855937
] 

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

bq. So if you pass CREATE on an already populated index, IW doesn't do the implicit commit,
until you call commit() yourself. But if you pass CREATE on an empty index, IW suddenly calls
commit()? 
Empty directory *is not* an empty index. It is just an empty directory. That first commit
initializes empty directory to an empty index. Seems this is the core of our misagreement.

> 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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