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https://issues.apache.org/jira/browse/LUCENE-2010?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12986346#action_12986346
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Michael McCandless commented on LUCENE-2010:
--------------------------------------------
bq. Do you want to fix the rest of the tests and remove the text-only
keepAllSegments method?
It's actually only the QueryUtils test class that uses this... it makes an
"empty" index by adding N docs and then deleting them all. So the test-only
API needs to be public (QueryUtils is in oal.search). I'll mark it as
lucene.internal...
> Remove segments with all documents deleted in commit/flush/close of
> IndexWriter instead of waiting until a merge occurs.
> ------------------------------------------------------------------------------------------------------------------------
>
> Key: LUCENE-2010
> URL: https://issues.apache.org/jira/browse/LUCENE-2010
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Index
> Affects Versions: 2.9
> Reporter: Uwe Schindler
> Assignee: Michael McCandless
> Fix For: 3.1, 4.0
>
> Attachments: LUCENE-2010.patch
>
>
> 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:
> {noformat}
> 4 of 14: name=_dlo docCount=5
> compound=true
> hasProx=true
> numFiles=2
> size (MB)=0.059
> diagnostics = {java.version=1.5.0_21, lucene.version=2.9.0 817268P -
> 2009-09-21 10:25:09, os=SunOS,
> os.arch=amd64, java.vendor=Sun Microsystems Inc., os.version=5.10,
> source=flush}
> has deletions [delFileName=_dlo_1.del]
> test: open reader.........OK [5 deleted docs]
> test: fields..............OK [136 fields]
> test: field norms.........OK [136 fields]
> test: terms, freq, prox...OK [1698 terms; 4236 terms/docs pairs; 0 tokens]
> test: stored fields.......OK [0 total field count; avg ? fields per doc]
> test: term vectors........OK [0 total vector count; avg ? term/freq vector
> fields per doc]
> {noformat}
> Shouldn't such segments not be removed automatically during the next
> commit/close of IndexWriter?
> *Mike McCandless:*
> 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.
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