Remove segments with all documents deleted in commit/flush/close of IndexWriter
instead of waiting until a merge occurs.
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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
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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