Michael McCandless created LUCENE-5693:
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Summary: don't write deleted documents on flush
Key: LUCENE-5693
URL: https://issues.apache.org/jira/browse/LUCENE-5693
Project: Lucene - Core
Issue Type: Improvement
Reporter: Michael McCandless
When we flush a new segment, sometimes some documents are "born deleted", e.g.
if the app did a IW.deleteDocuments that matched some not-yet-flushed documents.
We already compute the liveDocs on flush, but then we continue (wastefully) to
send those known-deleted documents to all Codec parts.
I started to implement this on LUCENE-5675 but it was too controversial.
Also, I expect typically the number of deleted docs is 0, or small, so not
writing "born deleted" docs won't be much of a win for most apps. Still it
seems silly to write them, consuming IO/CPU in the process, only to consume
more IO/CPU later for merging to re-delete them.
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