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From "Michael McCandless (JIRA)" <>
Subject [jira] Commented: (LUCENE-2386) IndexWriter commits unnecessarily on fresh Directory
Date Thu, 08 Apr 2010 20:40:36 GMT


Michael McCandless commented on LUCENE-2386:

I agree: IW really should not commit the first segments_1, for CREATE when Dir has no index
already.  App should immediately .commit() if it really wants to.

We should fix IFD to know if it's dealing with a "known new" index and bypass that check that
works around stale NFS dir listing (boolean arg sounds good).

> IndexWriter commits unnecessarily on fresh Directory
> ----------------------------------------------------
>                 Key: LUCENE-2386
>                 URL:
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: Index
>            Reporter: Shai Erera
>            Assignee: Shai Erera
>             Fix For: 3.1
> 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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