[jira] Commented: (LUCENE-2047) IndexWriter should immediately resolve deleted docs to docID in near-real-time mode

["Jason Rutherglen (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/LUCENE-2047?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12775115#action_12775115 ] 

Jason Rutherglen commented on LUCENE-2047:
------------------------------------------

Is this going to be an option or default to true only when NRT is on?

Also, I can create a patch for this.

> IndexWriter should immediately resolve deleted docs to docID in near-real-time mode
> -----------------------------------------------------------------------------------
>
>                 Key: LUCENE-2047
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2047
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Index
>            Reporter: Michael McCandless
>            Assignee: Michael McCandless
>            Priority: Minor
>             Fix For: 3.0
>
>
> Spinoff from LUCENE-1526.
> When deleteDocuments(Term) is called, we currently always buffer the
> Term and only later, when it's time to flush deletes, resolve to
> docIDs.  This is necessary because we don't in general hold
> SegmentReaders open.
> But, when IndexWriter is in NRT mode, we pool the readers, and so
> deleting in the foreground is possible.
> It's also beneficial, in that in can reduce the turnaround time when
> reopening a new NRT reader by taking this resolution off the reopen
> path.  And if multiple threads are used to do the deletion, then we
> gain concurrency, vs reopen which is not concurrent when flushing the
> deletes.

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