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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] Updated: (LUCENE-2679) IndexWriter.deleteDocuments should have option to not apply to docs indexed in the current IW session
Date Sat, 02 Oct 2010 15:18:32 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-2679?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Michael McCandless updated LUCENE-2679:
---------------------------------------

    Fix Version/s: 4.0

> IndexWriter.deleteDocuments should have option to not apply to docs indexed in the current
IW session
> -----------------------------------------------------------------------------------------------------
>
>                 Key: LUCENE-2679
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2679
>             Project: Lucene - Java
>          Issue Type: Improvement
>            Reporter: Michael McCandless
>             Fix For: 4.0
>
>
> In LUCENE-2655 we are struggling with how to handle buffered deletes,
> with the new per-thread RAM buffers (DWPT).
> But, the only reason why we must maintain a map of del term -> current
> docID (or sequence ID) is to correctly handle the interleaved adds &
> deletes case.
> However, I suspect that for many apps that interleaving never happens.
> Ie, most apps delete only docs from *before* the last commit or NRT
> reopen.  For such apps, we don't need a Map... we just need a Set of
> all del terms to apply to past segments but not to the currently
> buffered docs.
> And, importantly, with LUCENE-2655, this would be a single Set, not
> one per DWPT.  It should be a a healthy RAM reduction on buffered
> deletes, and should make the deletes call faster (add to one set instead of
> N maps).
> We of course must still support the interleaved case, and I think it
> should be the default, but I think we should provide the option for
> the common-case apps to take advantage of much less RAM usage.

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