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Michael McCandless commented on LUCENE-2386:
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Yeah I think new IW(), set maxBufferedDocs to 2, index 2 docs so a flush happens, then rollback,
then confirm dir is empty?
> 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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