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From "Shai Erera (JIRA)" <j...@apache.org>
Subject [jira] Updated: (LUCENE-2386) IndexWriter commits unnecessarily on fresh Directory
Date Fri, 09 Apr 2010 13:41:50 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-2386?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Shai Erera updated LUCENE-2386:
-------------------------------

    Attachment: LUCENE-2386.patch

Patch fixes all tests as well as changes to IndexWriter, IndexFileDeleter, DirectoryReader
and SegmentInfos.

I'd like to commit this shortly, before all the files get changed by a malicious other commit
:). (kidding of course)

> 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
>
>
> 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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