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https://issues.apache.org/jira/browse/LUCENE-3197?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13049298#comment-13049298
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Yonik Seeley commented on LUCENE-3197:
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Regardless of if one views this as a bug or not, I think the more useful
semantics are to at least "merge all of the current segments into 1 and remove
all *currently* deleted docs" (i.e. I agree with Mike). The alternative is
that optimize is dangerous in the presence of index updates (i.e. applications
should discontinue updates if they call optimize).
> Optimize runs forever if you keep deleting docs at the same time
> ----------------------------------------------------------------
>
> Key: LUCENE-3197
> URL: https://issues.apache.org/jira/browse/LUCENE-3197
> Project: Lucene - Java
> Issue Type: Bug
> Components: core/index
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Priority: Minor
> Fix For: 3.3, 4.0
>
>
> Because we "cascade" merges for an optimize... if you also delete documents
> while the merges are running, then the merge policy will see the resulting
> single segment as still not optimized (since it has pending deletes) and do a
> single-segment merge, and will repeat indefinitely (as long as your app keeps
> deleting docs).
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