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https://issues.apache.org/jira/browse/LUCENE-1960?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12769966#action_12769966
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Michael McCandless commented on LUCENE-1960:
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bq. I do not know if this is a bug in 2.9.0, but it seems that segments with
all documents deleted are not automatically removed
Lucene doesn't actually short-circuit this case, ie, if every single doc in a
given segment has been deleted, it will still merge it [away] like normal,
rather than simply dropping it immediately from the index, which I agree would
be a simple optimization. Can you open a new issue? I would think IW can drop
such a segment immediately (ie not wait for a merge or optimize) on flushing
new deletes.
> Remove deprecated Field.Store.COMPRESS
> --------------------------------------
>
> Key: LUCENE-1960
> URL: https://issues.apache.org/jira/browse/LUCENE-1960
> Project: Lucene - Java
> Issue Type: Task
> Reporter: Michael Busch
> Assignee: Michael Busch
> Priority: Minor
> Fix For: 3.0
>
> Attachments: lucene-1960-1.patch, lucene-1960-1.patch,
> lucene-1960.patch, optimize-time.txt
>
>
> Also remove FieldForMerge and related code.
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