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https://issues.apache.org/jira/browse/LUCENE-2386?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12855421#action_12855421
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Michael McCandless commented on LUCENE-2386:
--------------------------------------------

Patch looks good!

Hmm... maybe we should rename SegmentsFileNotFoundException to 
IndexNotFoundException?  Ie make it more consumable to outside apps (who should 
know nothing about what a segments file is).  And, move it to its own source 
file?


> 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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