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https://issues.apache.org/jira/browse/LUCENE-5116?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Shai Erera updated LUCENE-5116:
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Attachment: LUCENE-5116.patch
Patch adds tests for empty index and all deleted (fake) segment (thanks Rob!)
and fixes IW.addIndexes.
Rob and I chatted about adding a check to CheckIndex, 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.
This issue is more an optimization I guess than a bug -- don't do wasted work
on segments that will be dropped.
> 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
> 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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