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https://issues.apache.org/jira/browse/LUCENE-5116?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13713603#comment-13713603
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Robert Muir commented on LUCENE-5116:
-------------------------------------
{quote}
asserting there are no empty segments. But I'm not sure we should, because
technically it's not an error. I.e. you could do new IW().commit() and it's a
perfectly valid index.
{quote}
Wait: I still think we need to. Ill open an issue and take care of it.
The difference is: new IW().commit() should make a "empty commit" (segments_N
with no segments). Not a 0 document segment...
> IW.addIndexes doesn't prune all deleted segments
> ------------------------------------------------
>
> Key: LUCENE-5116
> URL: https://issues.apache.org/jira/browse/LUCENE-5116
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Robert Muir
> Assignee: Shai Erera
> Fix For: 5.0, 4.5
>
> Attachments: LUCENE-5116.patch, LUCENE-5116_test.patch
>
>
> at the least, this can easily create segments with maxDoc == 0.
> It seems buggy: elsewhere we prune these segments out, so its expected to
> have a commit point with no segments rather than a segment with 0 documents...
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