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From "Jason Rutherglen (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-2047) IndexWriter should immediately resolve deleted docs to docID in near-real-time mode
Date Fri, 13 Nov 2009 01:46:39 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2047?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12777325#action_12777325
] 

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

I think there's a fundamental design issue here. What happens to
documents that need to be deleted but are still in the RAM
buffer? Because we're not buffering the deletes those wouldn't
be applied. Or would we still buffer the deletes, then only
apply them only to the new SR created from the RAM buffer when
flush or getReader is called?



> 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: 3.1
>
>         Attachments: LUCENE-2047.patch, LUCENE-2047.patch
>
>
> 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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