[jira] [Created] (LUCENE-5693) don't write deleted documents on flush

["Michael McCandless (JIRA)" <ji...@apache.org>]

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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