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Posted to dev@lucene.apache.org by "Uwe Schindler (JIRA)" <ji...@apache.org> on 2013/05/10 01:06:02 UTC
[jira] [Updated] (LUCENE-2679) IndexWriter.deleteDocuments should
have option to not apply to docs indexed in the current IW session
[ https://issues.apache.org/jira/browse/LUCENE-2679?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Uwe Schindler updated LUCENE-2679:
----------------------------------
Fix Version/s: (was: 4.3)
4.4
> 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 - Core
> Issue Type: Improvement
> Reporter: Michael McCandless
> Fix For: 4.4
>
>
> 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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